Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Chemistry of the uranyl group. Preparation and crystal and molecular structure of bis-(<i>NN</i>-diethyl diselenocarbamate)dioxo(triphenylarsine oxide)uranium(VI), UO₂[Et₂NCSe₂]₂Ph₃AsO 10.1039/C29710001501 Zarli B. Graziani R. Forsellini E. Croatto U. Bombieri G. 1971 1971 23 1501 1502 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry The bis[tris-(<i>o</i>-dimethylarsinophenyl)stibine]nickel(II) cation. A pentaco-ordinate complex containing the novel [Ni(Sb₂As₃)]²⁺ donor set 10.1039/C29710001502 Baracco L. Halfpenny M. T. MacAuliffe C. A. 1971 1971 23 1502 1502 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Benz[<i>e</i>]isoindole 10.1039/C29710001503 Bornstein J. McGowan D. A. DiSalvo A. L. Shields Joan E. Kopecký J. 1971 1971 23 1503 1504 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Hydroxylamine oxidation by lead tetra-acetate: <i>O</i>-benzyl- and <i>O</i>-phenylhydroxylamine 10.1039/C29710001504 Partch Richard Stokes B. Bergman D. Budnik M. 1971 1971 23 1504 1505 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Aromatic proton magnetic resonances that are not shifted by Eu(dpm)₃ 10.1039/C29710001505 Bhacca Norman S. Wander J. D. 1971 1971 23 1505 1506 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Transguanylation and formation of 2-aminothiazoline from <i>S</i>-(2-aminoethyl)isothiourea 10.1039/C29710001506 Hallas Michael D. Reed Patsy Bostick Martin R. Bruce 1971 1971 23 1506 1507 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry The reaction of 2-methylpent-2-ene with <i>p</i>-nitrosophenol and with <i>NN</i>-dimethyl-<i>p</i>-nitrosoaniline 10.1039/C29710001507 Knight G. T. Pepper B. 1971 1971 23 1507 1508 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Cationic trialkyl phosphite complexes of gold, silver, and the platinum metals 10.1039/C29710001508 Couch D. A. Robinson S. D. 1971 1971 23 1508 1509 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Formation of 5,6-dinitrocyclohex-3-enones in the nitration of polyalkylbenzenes 10.1039/C29710001509 Suzuki H. Sawaki M. Sakimoto R. 1971 1971 23 1509 1510 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Catalytic coupling of aromatics and olefins by homogeneous palladium(II) compounds under oxygen 10.1039/C29710001510 Shue Robert S. 1971 1971 23 1510 1511 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry The crystal and molecular structures (at –40 °C) of the tetrabenzyls of titanium, hafnium, and tin 10.1039/C29710001511 Davies Gwyneth R. Jarvis J. A. J. Kilbourn B. T. 1971 1971 23 1511 1512 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Mechanism and inverse primary kinetic isotope effect in the reaction of fluorenylidene with 3-deuteriocyclohexene 10.1039/C29710001512 Baldwin John E. Andrist A. Harry 1971 1971 23 1512 1513 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Synthesis and fluxional behaviour of cycloheptatrienylmanganesetricarbonyl and cycloheptatrienylirontricarbonyl cation 10.1039/C29710001514 Whitesides Thomas H. Budnik Richard A. 1971 1971 23 1514 1514 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry The synthesis of bicyclic nucleosides related to uridine, 4-(β-D-ribofuranosyl)thiazolo[5,4-<i>d</i>]pyrimidines 10.1039/C29710001515 Schmidt Charles L. Rusho William J. Townsend Leroy B. 1971 1971 23 1515 1516 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Concerning the 1,5-didehydro[10]annulene system 10.1039/C29710001516 Darby N. Kim C. U. Salaün J. A. Shelton K. W. Takada S. Masamune S. 1971 1971 23 1516 1517 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Formation of 2<i>H</i>-azirines by the pyrolysis of 1,2,3-triazoles 10.1039/C29710001518 Anderson D. J. Gilchrist T. L. Gymer G. E. Rees C. W. 1971 1971 23 1518 1518 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Mechanism of the pyrolysis of 1,2,3-triazoles. 1<i>H</i>-Azirines as intermediates 10.1039/C29710001519 Gilchrist T. L. Gymer G. E. Rees C. W. 1971 1971 23 1519 1520 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry A novel di-hetero azulene: 4<i>H</i>-thieno[3,4-<i>d</i>]-azepine 10.1039/C29710001520 Hoogzand C. Nielsen J. Braye E. H. 1971 1971 23 1520 1521 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Homoconjugation in <i>N</i>-alkylketimines 10.1039/C29710001521 Warren R. G. Chow Y. Ferguson L. N. 1971 1971 23 1521 1522 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Abundant rearrangement ions in the mass spectra of benzeneboronic acid derivatives 10.1039/C29710001522 Cone C. Dewar Michael J. S. Golden R. Maseles Floyd Rona Peter 1971 1971 23 1522 1523 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry The crystal and molecular structure of Pollards salt, (NH₄)₆(AuCl₄)₃Ag₂Cl₅ 10.1039/C29710001523 Bowles J. C. Hall D. 1971 1971 23 1523 1523 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Lead tetra-acetate oxidation of <i>NN</i>-dimethylglycine and its relevance to the biosynthesis of the pyrrolidine ring of nicotine 10.1039/C29710001524 Leete Edward 1971 1971 23 1524 1525 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Photoadditions of an alicyclic thioketone 10.1039/C29710001525 Liao C. C. Mayo P. de 1971 1971 23 1525 1526 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Intermediacy of <i>O</i>-sulphinates in the reaction of transition-metal carbonyl alkyls and aryls with sulphur dioxide 10.1039/C29710001526 Jacobson S. E. Reich-Rohrwig P. Wojcicki A. 1971 1971 23 1526 1527 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Cleavage of linear tetrapeptides into two cyclic dipeptides 10.1039/C29710001527 Titlestad Kirsten 1971 1971 23 1527 1529 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Kinetic hydrogen isotope effects in the catalytic hydrogenation of alkenes 10.1039/C29710001529 Siegel Samuel Ohrt David W. 1971 1971 23 1529 1530 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Infrared evidence for complex hydrogen bonded cations 10.1039/C29710001530 Clements R. Masri F. N. Wood J. L. 1971 1971 23 1530 1532 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Molecular structure of one of the 1:2 adducts from diphenylsulphur di-imide and diphenylketen 10.1039/C29710001532 Kai Yasushi Yasuoka Noritake Kasai Nobutami Minami Toru Yamataka Kazunori Ohshiro Yoshiki Agawa Toshio 1971 1971 23 1532 1532 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry The photochemically induced reaction of bromotrichloromethane with triethylborane and related trialkylboranes. A new route to α-bromination of trialkylboranes 10.1039/C29710001535 Brown Herbert C. Yamamoto Yoshinori 1971 1971 23 1535 1536 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Crystal and molecular structure of a novel 1:1 cycloadduct of [2,2](2,5)-furanophane (13,14-dioxatricyclo[8,2,1,1^4,7]tetradec-4,6,10,12-tetraene) with tetrachlorocyclopropene 10.1039/C29710001536 Battiste M. A. Kapicak L. A. Mathew M. Palenik G. J. 1971 1971 23 1536 1537 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Preparation and acetalization of cyclo-oct-5-ene-1,2-dione 10.1039/C29710001537 Yates Peter Lewars E. G. 1971 1971 23 1537 1538 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Intramolecular general base catalysis by the ionised carboxy-group of the hydrolysis of aryl hydrogen malonates 10.1039/C29710001538 Kirby A. J. Lloyd G. J. 1971 1971 23 1538 1540 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Synthesis of <i>N</i>-acyl amino-acids by a carbonylation reaction 10.1039/C29710001540 Wakamatsu H. Uda J. Yamakami N. 1971 1971 23 1540 1540 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry The biosynthesis of spectinomycin 10.1039/C29710001541 Mitscher L. A. Martin L. L. Feller D. R. Martin J. R. Goldstein A. W. 1971 1971 23 1541 1542 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Trifluoroxenon(IV)µ-fluoro-bispentafluoroantimonate(V): the XeF₃⁺ cation 10.1039/C29710001543 Gillespie R. J. Landa B. Schrobilgen G. J. 1971 1971 23 1543 1544 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Reversible oxidations in ditertiary-phosphine bridged derivatives of [(π-C₅H₅)Fe(CO)₂]₂ 10.1039/C29710001544 Ferguson John A. Meyer Thomas J. 1971 1971 23 1544 1545 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry <i>N</i>-iminobenzocinnolinium ylides and dibenzo-1,2,3-triazepines 10.1039/C29710001545 Gait Stephanie F. Rees C. W. Storr R. C. 1971 1971 23 1545 1546 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Nucleophilic displacement at carbon bearing nitrogen 10.1039/C29710001546 Glass Richard S. 1971 1971 23 1546 1547 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Structure of organometallic derivatives of quinquevalent antimony and bismuth containing metal–oxygen–metal bonds 10.1039/C29710001547 Ferguson George Goel R. G. March Frank C. Ridley D. R. Prasad H. S. 1971 1971 23 1547 1549 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Synthesis of 6<i>H</i>,11<i>H</i>-pyrrolo[1,2-<i>b</i>][2,5]benzodiazocine: a new nitrogen heterocyclic system 10.1039/C29710001549 Martino G. De Massa S. Scalzo M. Giuliano R. Artico M. 1971 1971 23 1549 1549 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Novel acetoxylation reactions of 7-methylquinoxalin-2(1<i>H</i>)-one 4-<i>N</i>-oxides 10.1039/C29710001550 Mason J. C. Tennant G. 1971 1971 23 1550 1551 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Anionic halide complexes of indium(I) 10.1039/C29710001552 Contreras G. Tuck D. G. 1971 1971 23 1552 1553 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry The crystal and molecular structure of citrinin 10.1039/C29710001553 Rodig Oscar R. Shiro Motoo Fernando Quintus 1971 1971 23 1553 1554 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Synthesis and cycloaddition of 3-phenyl-Δ²-pyrroline-4,5-dione, a new dienophile 10.1039/C29710001554 Tsuda Y. Isobe K. Ukai A. 1971 1971 23 1554 1555 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Stereoselective total synthesis of the alkaloid haemanthamine 10.1039/C29710001555 Tsuda Y. Isobe K. 1971 1971 23 1555 1556 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry <i>O</i>-bonded and <i>S</i>-bonded sulphinate complexes of iridium(I) and iridium(III). Ligand isomerisation accompanying change in co-ordination number 10.1039/C29710001556 Reed C. A. Roper W. R. 1971 1971 23 1556 1557 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Extended range ambient temperature nematic mesophase in binary systems of <i>N</i>-(4-n-alkoxybenzylidene)-4-n-alkylanilines 10.1039/C29710001557 Fishel D. L. Hsu Ying Yen 1971 1971 23 1557 1558 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Ring inversion in 1,4-dioxan 10.1039/C29710001558 Anet F. A. L. Sandstrom J. 1971 1971 23 1558 1559 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry One-electron photo-oxidation of inorganic anions by 9,10-anthraquinone-2,6-disulphonic acid in the triplet state 10.1039/C29710001559 Kuzmin V. A. Chibisov A. K. 1971 1971 23 1559 1560 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry 4,9-Dimethyl-2,6-diazaspiro[4,5]dec-3-ene-1,7-dione: an unusual reaction product from 2-methylepichlorohydrin and potassium cyanide 10.1039/C29710001560 Moppett Charles E. Johnson Francis Dix Don T. 1971 1971 23 1560 1561 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Synthesis of (±)-canadensolide and its C-5 epimer. Revision of the stereochemistry 10.1039/C29710001561 Kato Michiharu Tanaka Reiko Yoshikoshi Akira 1971 1971 23 1561 1562 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry A novel mode of dimerisation of a 1,2-benzoquinone 10.1039/C29710001562 Ansell M. F. Bignold A. J. 1971 1971 23 1562 1563 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry [1,3]-<i>vs.</i>[1,2]-Sigmatropic photorearrangements in cyclic βγ-unsaturated ketones. Conversion of bicyclo[5,4,0]undec-1(7)-en-3-one into 6-methylene-spiro[4,5]decan-1-one 10.1039/C29710001564 Williams John R. Sarkisian George M. 1971 1971 23 1564 1565 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry “Amplifying” effect of hydrogen bonding on the correlation of frequencies of O–H stretching vibrations of phenols with Hammett substituent constants 10.1039/C29710001565 Bekárek V. 1971 1971 23 1565 1566 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Symmetrical hydrogen bonds in the crystal structure of calcium bis(dihydrogen arsenate): a neutron-diffraction study 10.1039/C29710001566 Ferraris G. Jones D. W. Yerkess J. 1971 1971 23 1566 1567 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Gas-phase molecular structures of BrF₅ and IF₅: information from electron diffraction and rotational constant data 10.1039/C29710001567 Robiette A. G. Bradley R. H. Brier P. N. 1971 1971 23 1567 1568 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Crystallographic evidence for the existence of the phases In₄Se₃ and In₄Te₃ which contain the homonuclear triatomic cation (In₃)⁵⁺ 10.1039/C29710001568 Hogg J. H. C. Sutherland H. H. Williams D. J. 1971 1971 23 1568 1569 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Suprafacial alkyl 1,2-shift in the rearrangement of thermally generated oxygen diradicals 10.1039/C29710001569 Adam Waldemar Wilkerson Carlos 1971 1971 23 1569 1570 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Preparation and crystal and molecular structure of a trigonal bipyramidal iridium(I) complex containing only phosphorus as donor atoms 10.1039/C29710001570 Venanzi L. M. Spagna R. Zambonelli L. 1971 1971 23 1570 1571 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Dissociation of tris(triphenylphosphine)chlorohodium(I) in solution 10.1039/C29710001571 Arai Hiromichi Halpern Jack 1971 1971 23 1571 1572 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Photochemical formation of diamides from <i>p</i>-nitrophenylbenzamide 10.1039/C29710001572 Hoshino Osamu Sawaki Shohei Miyazaki Naomi Umezawa Bunsuke 1971 1971 23 1572 1573 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Selection of dipivalomethanate chelates as shift reagents for nitrogen-14 nuclear magnetic resonance 10.1039/C29710001573 Witanowski M. Stefaniak L. Januszewski H. Wolkowski Z. W. 1971 1971 23 1573 1575 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Photorearrangement of an unsymmetric azo-compound 10.1039/C29710001575 Porter N. A. Iloff Jun.  P. M. 1971 1971 23 1575 1576 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Stereospecific cyclopropane formation <i>via</i> internal methylene transfer 10.1039/C29710001576 Matthews Richard S. Meteyer Thomas E. 1971 1971 23 1576 1577 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Optical resolution and absolute configuration of oxosulphonium ions 10.1039/C29710001577 Kobayashi Michio Kamiyama Kenzi Minato Hiroshi Oishi Yukio Takada Yoko Hattori Yoshitaka 1971 1971 23 1577 1578 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Some 1,3-dipolar addition reactions of isoquinolinium ylides : formation of 2,3-dihydrobenzo[<i>g</i>]indolizines and benzoindolizines 10.1039/C29710001578 Basketter N. Plunkett A. O. 1971 1971 23 1578 1578 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Reaction of 4,4-dimethyloxazolidine-<i>N</i>-oxyl (doxyl) derivatives with nitrogen dioxide: a novel and efficient reconversion into the parent ketone 10.1039/C29710001580 Nelson James A. Chou Sunwen Spencer Thomas A. 1971 1971 23 1580 1580 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Transformation of carbon–mercury bonds into carbon–carbon bonds; chloro-(<i>exo</i>-3-acetoxy-<i>endo</i>-5-nortricyclyl)dipyridinepalladium and unsaturated mercurials 10.1039/C29710001582 Vedejs E. Salomon M. F. 1971 1971 23 1582 1583 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Nickel complex-catalysed reactions of butadiene with amines 10.1039/C29710001583 Baker R. Halliday D. E. Smith T. N. 1971 1971 23 1583 1584 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Synthesis of (±)-thaliporphine; acid-catalysed rearrangement of a <i>p</i>-quinol acetate 10.1039/C2971001533a Hoshino Osamu Toshioka Tadashi Umezawa Bunsuke 1971 1971 23 1533a 1533a Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Correlation between the signs of magnetic circular dichroism bands and structure in carbonyl compounds 10.1039/C2971001533b Totty R. N. Hudec J. 1971 1971 23 1533b 1534 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Molecular structures of methyl(cyclopentadienyl)beryllium and cyclopentadienylberyllium chloride by gas-phase electron diffraction 10.1039/C2971001551a Drew D. A. Haaland Arne 1971 1971 23 1551a 1551a Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Red- and Near-infrared-luminescent benzazole derivatives 10.1039/C2971001551b Orlando Jun.  C. M. Wirth J. G. Heath D. R. 1971 1971 23 1551b 1552 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry 4-Phenoxyflavan-3-ols 10.1039/C2971001579a Brown B. R. Shaw M. R. 1971 1971 23 1579a 1579a Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry Oxaspiropentane. A rapid route to cyclobutanone 10.1039/C2971001579b Salaün J. R. Conia J. M. 1971 1971 23 1579b 1580 Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry The optical stability of a chiral germyl radical 10.1039/C2971001581a Sakurai Hideki Mochida Kunio 1971 1971 23 1581a 1581a Abstract PDF research-article

Journal of the Chemical Society D: Chemical Communications Royal Society of Chemistry The deacetoxylation of 17β-acetoxy-steroids on alumina 10.1039/C2971001581b Kanojia Ramesh Rovinsky Steven Scheer Irving 1971 1971 23 1581b 1582 Abstract PDF research-article