Supplementary Material (ESI) for Chemical Communications This journal is © The Royal Society of Chemistry 2002 data_dom11 _database_code_CSD 162970 _audit_creation_date 2001-04-30T15:13:21-00:00 _audit_creation_method 'WinGX routine CIF_UPDATE' _journal_coden_Cambridge 182 loop_ _publ_author_name 'Strohmann, Carsten' 'Auer, Dominik' 'Hornig, Jan' _publ_contact_author_name 'Dr Carsten Strohmann' _publ_contact_author_address ; Anorganische Chemie Universität Würzburg Am Hubland Wurzburg Bayern 97074 GERMANY ; _publ_contact_author_email c.strohmann@mail.uni-wuerzburg.de _publ_requested_journal 'Chemical Communications' _publ_section_title ; Synthesis of a highly enantiomerically enriched silyllithium compound ; #----------------------------------------------------------------------------# # CHEMICAL INFORMATION # #----------------------------------------------------------------------------# _chemical_name_systematic ; ? ; _chemical_formula_sum 'C34 H43 N O4 Si2' _chemical_formula_weight 585.87 #----------------------------------------------------------------------------# # UNIT CELL INFORMATION # #----------------------------------------------------------------------------# _symmetry_cell_setting Monoclinic _symmetry_space_group_name_H-M P21 loop_ _symmetry_equiv_pos_as_xyz 'x, y, z' '-x, y+1/2, -z' _cell_length_a 9.886(2) _cell_length_b 12.973(3) _cell_length_c 13.140(3) _cell_angle_alpha 90 _cell_angle_beta 107.83(3) _cell_angle_gamma 90 _cell_volume 1604.2(6) _cell_formula_units_Z 2 _cell_measurement_temperature 173(2) #----------------------------------------------------------------------------# # CRYSTAL INFORMATION # #----------------------------------------------------------------------------# _exptl_crystal_size_max 0.4 _exptl_crystal_size_mid 0.4 _exptl_crystal_size_min 0.2 _exptl_crystal_density_diffrn 1.213 _exptl_crystal_F_000 628 _exptl_special_details ; ? ; #----------------------------------------------------------------------------# # ABSORPTION CORRECTION # #----------------------------------------------------------------------------# _exptl_absorpt_coefficient_mu 0.148 #----------------------------------------------------------------------------# # DATA COLLECTION # #----------------------------------------------------------------------------# _diffrn_ambient_temperature 173(2) _diffrn_radiation_wavelength 0.71073 _diffrn_radiation_type MoK\a _diffrn_radiation_monochromator graphite _diffrn_measurement_device Stoe_IPDS _diffrn_measurement_method image_plate _diffrn_reflns_number 18908 _diffrn_reflns_av_R_equivalents 0.0833 _diffrn_reflns_av_sigmaI/netI 0.0567 _diffrn_reflns_limit_h_min -13 _diffrn_reflns_limit_h_max 13 _diffrn_reflns_limit_k_min -17 _diffrn_reflns_limit_k_max 17 _diffrn_reflns_limit_l_min -17 _diffrn_reflns_limit_l_max 17 _diffrn_reflns_theta_min 2.26 _diffrn_reflns_theta_max 25.99 _reflns_number_total 6102 _reflns_number_gt 5693 _reflns_threshold_expression >2sigma(I) #----------------------------------------------------------------------------# # COMPUTER PROGRAMS USED # #----------------------------------------------------------------------------# _computing_structure_refinement 'SHELXL-93 (Sheldrick, 1993)' #----------------------------------------------------------------------------# # REFINEMENT INFORMATION # #----------------------------------------------------------------------------# _refine_special_details ; Refinement on F^2^ for ALL reflections except for 0 with very negative F^2^ or flagged by the user for potential systematic errors. Weighted R-factors wR and all goodnesses of fit S are based on F^2^, conventional R-factors R are based on F, with F set to zero for negative F^2^. The observed criterion of F^2^ > 2sigma(F^2^) is used only for calculating _R_factor_obs etc. and is not relevant to the choice of reflections for refinement. R-factors based on F^2^ are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. ; _refine_ls_structure_factor_coef Fsqd _refine_ls_matrix_type full _refine_ls_weighting_scheme 'calc w=1/[\s^2^(Fo^2^)+(0.1018P)^2^+0.0818P] where P=(Fo^2^+2Fc^2^)/3' _atom_sites_solution_primary direct _atom_sites_solution_secondary difmap _atom_sites_solution_hydrogens geom _refine_ls_hydrogen_treatment riding_model,HO4A,HO4B_free _refine_ls_extinction_method none _refine_ls_number_reflns 6102 _refine_ls_number_parameters 384 _refine_ls_number_restraints 1 _refine_ls_R_factor_all 0.0556 _refine_ls_R_factor_gt 0.0524 _refine_ls_wR_factor_gt 0.1386 _refine_ls_wR_factor_all 0.1416 _refine_ls_goodness_of_fit_gt 1.08 _refine_ls_goodness_of_fit_all 1.064 _refine_ls_restrained_S_all 1.063 _refine_ls_restrained_S_obs 1.08 _refine_ls_shift/su_max 0 _refine_ls_shift/su_mean 0 _refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881' _refine_ls_abs_structure_Flack -0.03(11) _refine_diff_density_max 0.488 _refine_diff_density_min -0.386 _refine_diff_density_rms 0.063 #----------------------------------------------------------------------------# # ATOMIC TYPES, COORDINATES AND THERMAL PARAMETERS # #----------------------------------------------------------------------------# loop_ _atom_type_symbol _atom_type_description _atom_type_scat_dispersion_real _atom_type_scat_dispersion_imag _atom_type_scat_source C C 0.0033 0.0016 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' H H 0 0 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' N N 0.0061 0.0033 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' O O 0.0106 0.006 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' Si Si 0.0817 0.0704 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4' loop_ _atom_site_label _atom_site_type_symbol _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv _atom_site_adp_type _atom_site_occupancy _atom_site_calc_flag _atom_site_refinement_flags _atom_site_disorder_group Si1 Si 0.51924(7) 0.73213(5) 0.88904(5) 0.0315(2) Uani 1 d . . Si2 Si 0.55182(7) 0.57015(5) 0.81978(5) 0.0316(2) Uani 1 d . . N N 0.4802(2) 0.4980(2) 0.5980(2) 0.0295(4) Uani 1 d . . HN H 0.407(4) 0.464(2) 0.608(3) 0.039(8) Uiso 1 d . . O1 O 0.7808(3) 0.8737(2) 1.4417(2) 0.0656(7) Uani 1 d . . O2 O 0.8111(3) 1.0227(2) 1.3763(2) 0.0740(8) Uani 1 d . . O3 O 1.0707(3) 1.0078(2) 1.4052(2) 0.0638(7) Uani 1 d . . HO3 H 1.1088(3) 0.9935(2) 1.3579(2) 0.096 Uiso 1 calc R . O4 O 1.2527(3) 1.1878(3) 1.4592(3) 0.0711(8) Uani 1 d . . HO4A H 1.242(7) 1.254(6) 1.518(6) 0.13(2) Uiso 1 d . . HO4B H 1.208(5) 1.143(4) 1.478(4) 0.071(13) Uiso 1 d . . C1 C 0.6613(3) 0.8254(2) 0.8842(3) 0.0464(6) Uani 1 d . . H1A H 0.6413(15) 0.8928(6) 0.9100(19) 0.07 Uiso 1 calc R . H1B H 0.6635(18) 0.8318(15) 0.8105(4) 0.07 Uiso 1 calc R . H1C H 0.7535(5) 0.8003(10) 0.9297(16) 0.07 Uiso 1 calc R . C2 C 0.5305(3) 0.7081(2) 1.0323(2) 0.0332(5) Uani 1 d . . C3 C 0.4100(3) 0.6885(3) 1.0632(2) 0.0444(6) Uani 1 d . . H3 H 0.3193(3) 0.6867(3) 1.0105(2) 0.053 Uiso 1 calc R . C4 C 0.4205(4) 0.6715(3) 1.1698(3) 0.0560(8) Uani 1 d . . H4 H 0.3377(4) 0.6577(3) 1.1898(3) 0.067 Uiso 1 calc R . C5 C 0.5527(4) 0.6749(2) 1.2468(2) 0.0489(7) Uani 1 d . . H5 H 0.5605(4) 0.6639(2) 1.3198(2) 0.059 Uiso 1 calc R . C6 C 0.6716(3) 0.6940(2) 1.2180(2) 0.0465(7) Uani 1 d . . H6 H 0.7618(3) 0.6966(2) 1.2711(2) 0.056 Uiso 1 calc R . C7 C 0.6617(3) 0.7094(2) 1.1124(2) 0.0409(6) Uani 1 d . . H7 H 0.7458(3) 0.7212(2) 1.0935(2) 0.049 Uiso 1 calc R . C8 C 0.3406(3) 0.7883(2) 0.8177(2) 0.0354(5) Uani 1 d . . C9 C 0.3183(3) 0.8950(2) 0.8093(2) 0.0438(6) Uani 1 d . . H9 H 0.3961(3) 0.9404(2) 0.8377(2) 0.053 Uiso 1 calc R . C10 C 0.1841(3) 0.9354(3) 0.7601(3) 0.0559(8) Uani 1 d . . H10 H 0.1714(3) 1.0079(3) 0.7538(3) 0.067 Uiso 1 calc R . C11 C 0.0684(3) 0.8705(3) 0.7203(2) 0.0479(7) Uani 1 d . . H11 H -0.0237(3) 0.8985(3) 0.6887(2) 0.057 Uiso 1 calc R . C12 C 0.0875(3) 0.7668(3) 0.7265(2) 0.0496(7) Uani 1 d . . H12 H 0.0088(3) 0.7223(3) 0.6979(2) 0.059 Uiso 1 calc R . C13 C 0.2221(3) 0.7254(2) 0.7747(2) 0.0430(6) Uani 1 d . . H13 H 0.2335(3) 0.6527(2) 0.7783(2) 0.052 Uiso 1 calc R . C14 C 0.4402(3) 0.4688(2) 0.8557(2) 0.0439(6) Uani 1 d . . H14A H 0.4601(19) 0.4672(13) 0.9335(3) 0.066 Uiso 1 calc R . H14B H 0.4624(18) 0.4015(3) 0.8309(17) 0.066 Uiso 1 calc R . H14C H 0.3395(3) 0.4846(10) 0.8216(16) 0.066 Uiso 1 calc R . C15 C 0.7466(3) 0.5396(2) 0.8802(2) 0.0369(5) Uani 1 d . . C16 C 0.7923(4) 0.4617(3) 0.9552(3) 0.0518(7) Uani 1 d . . H16 H 0.7245(4) 0.4191(3) 0.9726(3) 0.062 Uiso 1 calc R . C17 C 0.9374(4) 0.4454(3) 1.0053(3) 0.0643(10) Uani 1 d . . H17 H 0.9677(4) 0.3911(3) 1.0558(3) 0.077 Uiso 1 calc R . C18 C 1.0361(4) 0.5075(3) 0.9818(3) 0.0608(9) Uani 1 d . . H18 H 1.1343(4) 0.4973(3) 1.0176(3) 0.073 Uiso 1 calc R . C19 C 0.9942(3) 0.5839(3) 0.9075(3) 0.0621(9) Uani 1 d . . H19 H 1.0630(3) 0.6265(3) 0.8911(3) 0.075 Uiso 1 calc R . C20 C 0.8505(3) 0.5992(2) 0.8558(3) 0.0486(7) Uani 1 d . . H20 H 0.8221(3) 0.6513(2) 0.8027(3) 0.058 Uiso 1 calc R . C21 C 0.5043(3) 0.5896(2) 0.6694(2) 0.0329(5) Uani 1 d . . H21A H 0.4171(3) 0.6322(2) 0.6469(2) 0.039 Uiso 1 calc R . H21B H 0.5813(3) 0.6308(2) 0.6558(2) 0.039 Uiso 1 calc R . C22 C 0.6020(2) 0.4233(2) 0.6288(2) 0.0340(5) Uani 1 d . . H22A H 0.6138(2) 0.3970(2) 0.7017(2) 0.041 Uiso 1 calc R . H22B H 0.6906(2) 0.4594(2) 0.6297(2) 0.041 Uiso 1 calc R . C23 C 0.5776(3) 0.3336(2) 0.5516(2) 0.0395(6) Uani 1 d . . H23A H 0.4926(3) 0.2945(2) 0.5541(2) 0.047 Uiso 1 calc R . H23B H 0.6604(3) 0.2866(2) 0.5730(2) 0.047 Uiso 1 calc R . C24 C 0.5563(3) 0.3720(2) 0.4385(2) 0.0471(7) Uani 1 d . . H24A H 0.5382(3) 0.3130(2) 0.3884(2) 0.057 Uiso 1 calc R . H24B H 0.6430(3) 0.4080(2) 0.4348(2) 0.057 Uiso 1 calc R . C25 C 0.4305(3) 0.4456(2) 0.4074(2) 0.0443(6) Uani 1 d . . H25A H 0.4182(3) 0.4728(2) 0.3348(2) 0.053 Uiso 1 calc R . H25B H 0.3429(3) 0.4077(2) 0.4059(2) 0.053 Uiso 1 calc R . C26 C 0.4521(3) 0.5337(2) 0.4851(2) 0.0380(6) Uani 1 d . . H26A H 0.5333(3) 0.5760(2) 0.4802(2) 0.046 Uiso 1 calc R . H26B H 0.3664(3) 0.5779(2) 0.4650(2) 0.046 Uiso 1 calc R . C27 C 1.0135(2) 0.9179(2) 1.4350(2) 0.0365(5) Uani 1 d . . H27 H 1.0606(2) 0.9060(2) 1.5130(2) 0.044 Uiso 1 calc R . C28 C 0.8538(3) 0.9373(2) 1.4172(2) 0.0441(7) Uani 1 d . . C29 C 1.0363(2) 0.8235(2) 1.3746(2) 0.0334(5) Uani 1 d . . C30 C 1.0349(3) 0.8315(2) 1.2686(2) 0.0387(6) Uani 1 d . . H30 H 1.0198(3) 0.8967(2) 1.2339(2) 0.046 Uiso 1 calc R . C31 C 1.0553(3) 0.7450(3) 1.2137(2) 0.0472(7) Uani 1 d . . H31 H 1.0561(3) 0.7513(3) 1.1419(2) 0.057 Uiso 1 calc R . C32 C 1.0746(3) 0.6496(2) 1.2623(3) 0.0468(7) Uani 1 d . . H32 H 1.0866(3) 0.5902(2) 1.2238(3) 0.056 Uiso 1 calc R . C33 C 1.0762(3) 0.6411(2) 1.3676(3) 0.0442(6) Uani 1 d . . H33 H 1.0895(3) 0.5755(2) 1.4015(3) 0.053 Uiso 1 calc R . C34 C 1.0587(3) 0.7275(2) 1.4240(2) 0.0367(5) Uani 1 d . . H34 H 1.0621(3) 0.7212(2) 1.4967(2) 0.044 Uiso 1 calc R . loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_23 _atom_site_aniso_U_13 _atom_site_aniso_U_12 Si1 0.0300(3) 0.0336(3) 0.0293(3) -0.0021(2) 0.0066(2) -0.0006(2) Si2 0.0328(3) 0.0320(3) 0.0300(3) -0.0002(2) 0.0093(2) -0.0002(3) N 0.0268(10) 0.0351(9) 0.0265(10) 0.0003(8) 0.0080(8) -0.0010(8) O1 0.0463(12) 0.0764(15) 0.087(2) -0.0203(14) 0.0394(13) -0.0144(12) O2 0.0601(15) 0.075(2) 0.075(2) 0.0032(13) 0.0033(13) 0.0343(13) O3 0.073(2) 0.0463(12) 0.088(2) -0.0166(12) 0.0490(14) -0.0201(11) O4 0.0409(12) 0.076(2) 0.097(2) -0.009(2) 0.0210(13) -0.0115(12) C1 0.0381(13) 0.0466(14) 0.052(2) -0.0002(12) 0.0102(12) -0.0073(11) C2 0.0313(11) 0.0359(12) 0.0292(12) -0.0031(9) 0.0046(9) 0.0026(9) C3 0.0307(12) 0.063(2) 0.0374(14) 0.0029(12) 0.0078(11) -0.0022(12) C4 0.045(2) 0.079(2) 0.050(2) 0.009(2) 0.0237(14) 0.004(2) C5 0.066(2) 0.053(2) 0.0279(13) 0.0018(11) 0.0146(13) 0.0065(14) C6 0.0457(15) 0.0520(15) 0.0328(14) -0.0005(11) -0.0010(12) 0.0087(12) C7 0.0306(11) 0.0521(15) 0.0352(13) -0.0035(11) 0.0031(10) 0.0014(10) C8 0.0358(12) 0.0412(13) 0.0274(12) -0.0045(10) 0.0071(10) 0.0007(10) C9 0.0452(15) 0.0361(13) 0.046(2) 0.0030(11) 0.0076(12) 0.0028(10) C10 0.049(2) 0.048(2) 0.064(2) 0.0134(14) 0.0082(15) 0.0106(13) C11 0.0418(15) 0.061(2) 0.0359(14) 0.0063(13) 0.0041(12) 0.0128(13) C12 0.0392(15) 0.061(2) 0.0406(15) -0.0073(12) 0.0002(12) 0.0045(13) C13 0.0394(13) 0.0396(12) 0.0441(14) -0.0058(11) 0.0039(11) 0.0018(11) C14 0.0483(15) 0.0424(13) 0.044(2) 0.0038(11) 0.0186(12) -0.0065(11) C15 0.0411(13) 0.0383(12) 0.0297(12) -0.0013(9) 0.0085(10) 0.0065(10) C16 0.052(2) 0.058(2) 0.044(2) 0.0087(13) 0.0125(13) 0.0091(13) C17 0.066(2) 0.075(2) 0.043(2) 0.011(2) 0.003(2) 0.026(2) C18 0.040(2) 0.083(2) 0.051(2) 0.001(2) 0.0001(14) 0.016(2) C19 0.0358(14) 0.072(2) 0.074(2) 0.004(2) 0.0087(15) 0.0051(15) C20 0.0365(14) 0.054(2) 0.054(2) 0.0082(13) 0.0114(13) 0.0078(11) C21 0.0344(12) 0.0307(11) 0.0338(12) -0.0006(9) 0.0107(10) 0.0028(9) C22 0.0260(10) 0.0382(12) 0.0360(13) -0.0007(10) 0.0068(9) 0.0005(9) C23 0.0351(13) 0.0371(12) 0.046(2) -0.0068(10) 0.0125(11) -0.0009(10) C24 0.051(2) 0.0488(14) 0.047(2) -0.0155(13) 0.0242(13) -0.0065(12) C25 0.050(2) 0.0486(15) 0.0314(13) -0.0021(11) 0.0089(11) -0.0092(12) C26 0.0438(14) 0.0397(12) 0.0269(12) 0.0023(9) 0.0056(10) -0.0032(10) C27 0.0237(10) 0.0433(13) 0.0405(14) -0.0027(11) 0.0070(9) -0.0015(10) C28 0.0299(12) 0.055(2) 0.0441(15) -0.0162(12) 0.0061(11) 0.0031(12) C29 0.0209(10) 0.0391(12) 0.0382(13) -0.0005(10) 0.0060(9) -0.0015(9) C30 0.0345(13) 0.0451(13) 0.0353(14) 0.0044(10) 0.0089(10) -0.0007(10) C31 0.0390(13) 0.067(2) 0.0385(14) -0.0062(13) 0.0163(11) -0.0047(13) C32 0.0356(13) 0.0464(14) 0.061(2) -0.0127(13) 0.0184(13) -0.0039(11) C33 0.0335(12) 0.0396(12) 0.057(2) -0.0013(12) 0.0100(12) -0.0025(10) C34 0.0276(11) 0.0425(12) 0.0390(13) 0.0035(11) 0.0087(9) 0.0002(10) #----------------------------------------------------------------------------# # MOLECULAR GEOMETRY # #----------------------------------------------------------------------------# _geom_special_details ; All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes. ; loop_ _geom_bond_atom_site_label_1 _geom_bond_atom_site_label_2 _geom_bond_distance _geom_bond_site_symmetry_2 _geom_bond_publ_flag Si1 C1 1.869(3) . ? Si1 C8 1.874(3) . ? Si1 C2 1.878(3) . ? Si1 Si2 2.3509(10) . ? Si2 C14 1.867(3) . ? Si2 C15 1.887(3) . ? Si2 C21 1.903(3) . ? N C21 1.488(3) . ? N C26 1.497(3) . ? N C22 1.501(3) . ? O1 C28 1.203(4) . ? O2 C28 1.248(4) . ? O3 C27 1.403(3) . ? C2 C3 1.394(4) . ? C2 C7 1.398(4) . ? C3 C4 1.390(5) . ? C4 C5 1.387(5) . ? C5 C6 1.363(5) . ? C6 C7 1.375(4) . ? C8 C13 1.397(4) . ? C8 C9 1.401(4) . ? C9 C10 1.388(4) . ? C10 C11 1.386(5) . ? C11 C12 1.357(5) . ? C12 C13 1.394(4) . ? C15 C16 1.386(4) . ? C15 C20 1.399(4) . ? C16 C17 1.400(5) . ? C17 C18 1.371(6) . ? C18 C19 1.364(6) . ? C19 C20 1.389(4) . ? C22 C23 1.513(4) . ? C23 C24 1.519(4) . ? C24 C25 1.521(4) . ? C25 C26 1.503(4) . ? C27 C29 1.513(4) . ? C27 C28 1.543(3) . ? C29 C34 1.390(4) . ? C29 C30 1.393(4) . ? C30 C31 1.382(4) . ? C31 C32 1.378(5) . ? C32 C33 1.384(5) . ? C33 C34 1.382(4) . ? loop_ _geom_angle_atom_site_label_1 _geom_angle_atom_site_label_2 _geom_angle_atom_site_label_3 _geom_angle _geom_angle_site_symmetry_1 _geom_angle_site_symmetry_3 _geom_angle_publ_flag C1 Si1 C8 109.52(13) . . ? C1 Si1 C2 109.07(13) . . ? C8 Si1 C2 108.86(12) . . ? C1 Si1 Si2 111.84(11) . . ? C8 Si1 Si2 111.93(8) . . ? C2 Si1 Si2 105.48(8) . . ? C14 Si2 C15 110.58(13) . . ? C14 Si2 C21 112.27(13) . . ? C15 Si2 C21 111.13(12) . . ? C14 Si2 Si1 111.70(11) . . ? C15 Si2 Si1 105.56(8) . . ? C21 Si2 Si1 105.29(8) . . ? C21 N C26 108.9(2) . . ? C21 N C22 112.7(2) . . ? C26 N C22 110.9(2) . . ? C3 C2 C7 117.5(3) . . ? C3 C2 Si1 121.9(2) . . ? C7 C2 Si1 120.6(2) . . ? C4 C3 C2 121.0(3) . . ? C5 C4 C3 119.6(3) . . ? C6 C5 C4 120.2(3) . . ? C5 C6 C7 120.4(3) . . ? C6 C7 C2 121.4(3) . . ? C13 C8 C9 116.9(2) . . ? C13 C8 Si1 121.4(2) . . ? C9 C8 Si1 121.7(2) . . ? C10 C9 C8 121.0(3) . . ? C11 C10 C9 120.5(3) . . ? C12 C11 C10 119.7(3) . . ? C11 C12 C13 120.3(3) . . ? C12 C13 C8 121.6(3) . . ? C16 C15 C20 117.6(3) . . ? C16 C15 Si2 121.4(2) . . ? C20 C15 Si2 120.9(2) . . ? C15 C16 C17 120.6(3) . . ? C18 C17 C16 120.1(3) . . ? C19 C18 C17 120.5(3) . . ? C18 C19 C20 119.7(3) . . ? C19 C20 C15 121.4(3) . . ? N C21 Si2 119.3(2) . . ? N C22 C23 111.4(2) . . ? C22 C23 C24 110.5(2) . . ? C23 C24 C25 109.0(2) . . ? C26 C25 C24 111.1(2) . . ? N C26 C25 112.4(2) . . ? O3 C27 C29 112.9(2) . . ? O3 C27 C28 107.7(2) . . ? C29 C27 C28 111.2(2) . . ? O1 C28 O2 124.9(3) . . ? O1 C28 C27 121.2(3) . . ? O2 C28 C27 113.9(3) . . ? C34 C29 C30 119.0(2) . . ? C34 C29 C27 120.6(2) . . ? C30 C29 C27 120.4(2) . . ? C31 C30 C29 120.2(2) . . ? C32 C31 C30 120.6(3) . . ? C31 C32 C33 119.5(3) . . ? C34 C33 C32 120.4(3) . . ? C33 C34 C29 120.3(3) . . ?