# Electronic Supplementary Material (ESI) for RSC Advances.
# This journal is © The Royal Society of Chemistry 2016

####################################################################### 
# 
# This file contains crystal structure data downloaded from the 
# Cambridge Structural Database (CSD) hosted by the Cambridge 
# Crystallographic Data Centre (CCDC).
# 
# Full information about CCDC data access policies and citation 
# guidelines are available at http://www.ccdc.cam.ac.uk/access/V1 
# 
# Audit and citation data items may have been added by the CCDC. 
# Please retain this information to preserve the provenance of 
# this file and to allow appropriate attribution of the data. 
# 
#######################################################################

data_yf07221s
_database_code_depnum_ccdc_archive 'CCDC 1017390'
_audit_update_record             
;
2014-08-01 deposited with the CCDC.
2016-06-17 downloaded from the CCDC.
;

_audit_creation_method           SHELXL-97
_chemical_name_systematic        
; 
 ? 
;
_chemical_name_common            ?
_chemical_melting_point          ?
_chemical_formula_moiety         ?
_chemical_formula_sum            'C20 H40 O3 Si'
_chemical_formula_weight         356.61
_chemical_absolute_configuration syn

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 0.0000 0.0000 'International Tables Vol C Tables 4.2.6.8 and 6.1.1.4'
O O 0.0106 0.0060 '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'

_symmetry_cell_setting           Orthorhombic
_symmetry_space_group_name_H-M   P2(1)2(1)2(1)

loop_
_symmetry_equiv_pos_as_xyz
'x, y, z'
'-x+1/2, -y, z+1/2'
'-x, y+1/2, -z+1/2'
'x+1/2, -y+1/2, -z'

_cell_length_a                   7.199(3)
_cell_length_b                   11.837(5)
_cell_length_c                   25.842(10)
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_volume                     2202.3(15)
_cell_formula_units_Z            4
_cell_measurement_temperature    293(2)
_cell_measurement_reflns_used    3495
_cell_measurement_theta_min      2.33
_cell_measurement_theta_max      22.16

_exptl_crystal_description       plate
_exptl_crystal_colour            colourless
_exptl_crystal_size_max          0.47
_exptl_crystal_size_mid          0.45
_exptl_crystal_size_min          0.13
_exptl_crystal_density_meas      ?
_exptl_crystal_density_diffrn    1.076
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             792
_exptl_absorpt_coefficient_mu    0.120
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_correction_T_min  0.6936
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_process_details   ?

_exptl_special_details           
; 
 ? 
;

_diffrn_ambient_temperature      293(2)
_diffrn_radiation_wavelength     0.71073
_diffrn_radiation_type           MoK\a
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_monochromator  graphite
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_detector_area_resol_mean ?
_diffrn_standards_number         ?
_diffrn_standards_interval_count ?
_diffrn_standards_interval_time  ?
_diffrn_standards_decay_%        ?
_diffrn_reflns_number            14303
_diffrn_reflns_av_R_equivalents  0.0429
_diffrn_reflns_av_sigmaI/netI    0.0575
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_l_min       -33
_diffrn_reflns_limit_l_max       33
_diffrn_reflns_theta_min         2.33
_diffrn_reflns_theta_max         28.03
_reflns_number_total             5167
_reflns_number_gt                3101
_reflns_threshold_expression     >2sigma(I)

_computing_data_collection       'Bruker SMART'
_computing_cell_refinement       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'

_refine_special_details          
; 
 Refinement of F² against ALL reflections.  The weighted R-factor wR and 
 goodness of fit S are based on F², conventional R-factors R are based 
 on F, with F set to zero for negative F². The threshold expression of 
 F² > 2sigma(F²) is used only for calculating R-factors(gt) etc. and is 
 not relevant to the choice of reflections for refinement.  R-factors based 
 on F² 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
_refine_ls_weighting_details     
'calc w=1/[σ²(Fo²)+(0.0473P)²+0.1390P] where P=(Fo²+2Fc²)/3'
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_atom_sites_solution_hydrogens   geom
_refine_ls_hydrogen_treatment    mixed
_refine_ls_extinction_method     none
_refine_ls_extinction_coef       ?
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.19(16)
_refine_ls_number_reflns         5167
_refine_ls_number_parameters     272
_refine_ls_number_restraints     2
_refine_ls_R_factor_all          0.0960
_refine_ls_R_factor_gt           0.0435
_refine_ls_wR_factor_ref         0.1149
_refine_ls_wR_factor_gt          0.0932
_refine_ls_goodness_of_fit_ref   0.997
_refine_ls_restrained_S_all      0.997
_refine_ls_shift/su_max          0.006
_refine_ls_shift/su_mean         0.002

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_symmetry_multiplicity
_atom_site_calc_flag
_atom_site_refinement_flags
_atom_site_disorder_assembly
_atom_site_disorder_group
C1A C 0.6919(7) 0.7985(3) 0.90165(18) 0.0986(13) Uani 0.85 1 d P A 1
H1A H 0.7503 0.8656 0.9147 0.148 Uiso 0.85 1 calc PR A 1
H1B H 0.5752 0.7874 0.9188 0.148 Uiso 0.85 1 calc PR A 1
H1C H 0.6713 0.8063 0.8651 0.148 Uiso 0.85 1 calc PR A 1
C2A C 0.8569(6) 0.6799(4) 0.97092(11) 0.1334(15) Uani 0.85 1 d P A 1
H2A H 0.9415 0.6181 0.9759 0.200 Uiso 0.85 1 calc PR A 1
H2B H 0.7422 0.6640 0.9884 0.200 Uiso 0.85 1 calc PR A 1
H2C H 0.9103 0.7477 0.9848 0.200 Uiso 0.85 1 calc PR A 1
C3A C 1.0063(5) 0.7132(3) 0.88484(15) 0.1013(10) Uani 0.85 1 d P A 1
H3A H 0.9880 0.7169 0.8481 0.152 Uiso 0.85 1 calc PR A 1
H3B H 1.0873 0.6513 0.8929 0.152 Uiso 0.85 1 calc PR A 1
H3C H 1.0612 0.7825 0.8967 0.152 Uiso 0.85 1 calc PR A 1
C4A C 0.8189(5) 0.6958(3) 0.91168(12) 0.0721(9) Uani 0.85 1 d P A 1
C5A C 0.4889(5) 0.5332(3) 0.92324(10) 0.0924(10) Uani 0.85 1 d P A 1
H5A H 0.4132 0.5999 0.9242 0.139 Uiso 0.85 1 calc PR A 1
H5B H 0.5192 0.5107 0.9579 0.139 Uiso 0.85 1 calc PR A 1
H5C H 0.4221 0.4734 0.9064 0.139 Uiso 0.85 1 calc PR A 1
C6A C 0.8673(7) 0.4402(4) 0.89020(16) 0.0911(12) Uani 0.85 1 d P A 1
H6A H 0.8071 0.3748 0.8761 0.137 Uiso 0.85 1 calc PR A 1
H6B H 0.9000 0.4261 0.9256 0.137 Uiso 0.85 1 calc PR A 1
H6C H 0.9775 0.4564 0.8707 0.137 Uiso 0.85 1 calc PR A 1
Si7A Si 0.70654(13) 0.56334(8) 0.88682(3) 0.0593(2) Uani 0.85 1 d P A 1
C1B C 0.940(4) 0.494(2) 0.9065(11) 0.095(8) Uani 0.15 1 d P A 2
H1D H 0.9827 0.4830 0.8717 0.143 Uiso 0.15 1 calc PR A 2
H1E H 0.8385 0.4433 0.9134 0.143 Uiso 0.15 1 calc PR A 2
H1F H 1.0391 0.4794 0.9303 0.143 Uiso 0.15 1 calc PR A 2
C2B C 0.8569(6) 0.6799(4) 0.97092(11) 0.1334(15) Uani 0.15 1 d P A 2
H2D H 0.8568 0.6223 0.9971 0.200 Uiso 0.15 1 calc PR A 2
H2E H 0.7442 0.7229 0.9732 0.200 Uiso 0.15 1 calc PR A 2
H2F H 0.9615 0.7289 0.9760 0.200 Uiso 0.15 1 calc PR A 2
C3B C 1.0063(5) 0.7132(3) 0.88484(15) 0.1013(10) Uani 0.15 1 d P A 2
H3D H 0.9741 0.7878 0.8964 0.152 Uiso 0.15 1 calc PR A 2
H3E H 0.9906 0.7085 0.8480 0.152 Uiso 0.15 1 calc PR A 2
H3F H 1.1334 0.6977 0.8935 0.152 Uiso 0.15 1 calc PR A 2
C4B C 0.871(3) 0.6204(16) 0.9132(7) 0.070(5) Uani 0.15 1 d P A 2
C5B C 0.4889(5) 0.5332(3) 0.92324(10) 0.0924(10) Uani 0.15 1 d P A 2
H5D H 0.5407 0.4592 0.9185 0.139 Uiso 0.15 1 calc PR A 2
H5E H 0.3651 0.5350 0.9094 0.139 Uiso 0.15 1 calc PR A 2
H5F H 0.4854 0.5508 0.9595 0.139 Uiso 0.15 1 calc PR A 2
C6B C 0.554(3) 0.7856(18) 0.8960(11) 0.101(9) Uani 0.15 1 d P A 2
H6D H 0.6442 0.8295 0.9146 0.151 Uiso 0.15 1 calc PR A 2
H6E H 0.4397 0.7841 0.9151 0.151 Uiso 0.15 1 calc PR A 2
H6F H 0.5330 0.8189 0.8626 0.151 Uiso 0.15 1 calc PR A 2
Si7B Si 0.6398(7) 0.6423(4) 0.88789(18) 0.0629(12) Uani 0.15 1 d P A 2
O8 O 0.6566(2) 0.59440(12) 0.82604(5) 0.0596(4) Uani 1 1 d . . .
C8 C 0.5655(3) 0.51676(18) 0.79222(8) 0.0535(6) Uani 1 1 d . A .
H8 H 0.5664 0.4419 0.8084 0.064 Uiso 1 1 calc R . .
C9 C 0.3652(3) 0.5512(2) 0.78296(9) 0.0628(6) Uani 1 1 d . . .
H9A H 0.2996 0.4891 0.7667 0.075 Uiso 1 1 calc R A .
H9B H 0.3061 0.5662 0.8160 0.075 Uiso 1 1 calc R . .
C11 C 0.3495(3) 0.6551(2) 0.74901(9) 0.0618(6) Uani 1 1 d . A .
H11A H 0.4028 0.7193 0.7670 0.074 Uiso 1 1 calc R . .
H11B H 0.2193 0.6713 0.7428 0.074 Uiso 1 1 calc R . .
C12 C 0.4486(3) 0.64021(18) 0.69697(8) 0.0526(5) Uani 1 1 d . . .
H12A H 0.3908 0.5791 0.6779 0.063 Uiso 1 1 calc R A .
H12B H 0.4361 0.7088 0.6767 0.063 Uiso 1 1 calc R . .
C13 C 0.6549(3) 0.61389(16) 0.70502(7) 0.0432(5) Uani 1 1 d . A .
C14 C 0.6664(3) 0.50902(16) 0.74067(7) 0.0467(5) Uani 1 1 d . . .
H14 H 0.6024 0.4489 0.7217 0.056 Uiso 1 1 calc R A .
C15 C 0.8692(3) 0.47607(19) 0.73982(8) 0.0548(6) Uani 1 1 d . A .
H15A H 0.8845 0.3961 0.7469 0.066 Uiso 1 1 calc R . .
H15B H 0.9395 0.5191 0.7651 0.066 Uiso 1 1 calc R . .
C16 C 0.9308(3) 0.50497(19) 0.68441(8) 0.0556(6) Uani 1 1 d . . .
H16A H 0.9609 0.4365 0.6656 0.067 Uiso 1 1 calc R A .
H16B H 1.0400 0.5529 0.6851 0.067 Uiso 1 1 calc R . .
C17 C 0.7671(3) 0.56729(17) 0.65796(7) 0.0463(5) Uani 1 1 d . A .
H17 H 0.6898 0.5097 0.6413 0.056 Uiso 1 1 calc R . .
C18 C 0.7544(3) 0.71861(16) 0.72729(8) 0.0516(5) Uani 1 1 d . . .
H18A H 0.6985 0.7390 0.7597 0.077 Uiso 1 1 calc R A .
H18B H 0.7432 0.7804 0.7034 0.077 Uiso 1 1 calc R . .
H18C H 0.8833 0.7016 0.7326 0.077 Uiso 1 1 calc R . .
C20 C 0.8315(3) 0.64932(17) 0.61520(8) 0.0497(5) Uani 1 1 d . . .
H20 H 0.9106 0.7059 0.6320 0.060 Uiso 1 1 calc R A .
C21 C 0.6754(3) 0.71380(19) 0.58833(8) 0.0599(6) Uani 1 1 d . A .
H21A H 0.6092 0.7573 0.6142 0.072 Uiso 1 1 calc R . .
H21B H 0.7308 0.7670 0.5643 0.072 Uiso 1 1 calc R . .
C22 C 0.9528(4) 0.5875(2) 0.57629(8) 0.0630(6) Uani 1 1 d . A .
H22A H 1.0584 0.5549 0.5942 0.076 Uiso 1 1 calc R . .
H22B H 0.8821 0.5262 0.5611 0.076 Uiso 1 1 calc R . .
O22 O 1.0182(3) 0.6597(2) 0.53611(7) 0.0780(5) Uani 1 1 d D . .
H22 H 1.134(2) 0.669(2) 0.5377(10) 0.086(10) Uiso 1 1 d D . .
C23 C 0.5373(4) 0.6436(3) 0.55933(10) 0.0813(8) Uani 1 1 d . . .
H23A H 0.5979 0.6088 0.5298 0.098 Uiso 1 1 calc R A .
H23B H 0.4923 0.5837 0.5817 0.098 Uiso 1 1 calc R . .
O23 O 0.3845(3) 0.7090(2) 0.54183(9) 0.1117(9) Uani 1 1 d D A .
H23 H 0.425(5) 0.756(2) 0.5194(11) 0.136(14) Uiso 1 1 d D . .


_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
C1A C4A 1.542(6) . ?
C2A C4A 1.566(4) . ?
C3A C4A 1.531(5) . ?
C4A Si7A 1.878(4) . ?
C5A Si7A 1.862(3) . ?
C6A Si7A 1.863(4) . ?
Si7A O8 1.6528(16) . ?
C1B C4B 1.59(3) . ?
C4B Si7B 1.81(2) . ?
C6B Si7B 1.82(2) . ?
Si7B O8 1.700(5) . ?
O8 C8 1.428(2) . ?
C8 C9 1.517(3) . ?
C8 C14 1.520(3) . ?
C9 C11 1.515(3) . ?
C11 C12 1.532(3) . ?
C12 C13 1.532(3) . ?
C13 C18 1.543(3) . ?
C13 C14 1.548(3) . ?
C13 C17 1.561(3) . ?
C14 C15 1.511(3) . ?
C15 C16 1.538(3) . ?
C16 C17 1.549(3) . ?
C17 C20 1.542(3) . ?
C20 C22 1.519(3) . ?
C20 C21 1.526(3) . ?
C21 C23 1.497(3) . ?
C22 O22 1.425(3) . ?
C23 O23 1.420(3) . ?

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
C3A C4A C1A 109.9(3) . . ?
C3A C4A C2A 107.8(3) . . ?
C1A C4A C2A 111.3(3) . . ?
C3A C4A Si7A 109.7(2) . . ?
C1A C4A Si7A 110.2(3) . . ?
C2A C4A Si7A 108.0(3) . . ?
O8 Si7A C5A 109.87(13) . . ?
O8 Si7A C6A 110.71(14) . . ?
C5A Si7A C6A 110.43(19) . . ?
O8 Si7A C4A 103.47(12) . . ?
C5A Si7A C4A 110.46(16) . . ?
C6A Si7A C4A 111.70(19) . . ?
C1B C4B Si7B 112.5(14) . . ?
O8 Si7B C4B 103.1(7) . . ?
O8 Si7B C6B 116.4(9) . . ?
C4B Si7B C6B 113.9(12) . . ?
C8 O8 Si7A 122.58(13) . . ?
C8 O8 Si7B 139.2(2) . . ?
Si7A O8 Si7B 36.52(16) . . ?
O8 C8 C9 111.11(19) . . ?
O8 C8 C14 110.84(17) . . ?
C9 C8 C14 109.39(18) . . ?
C11 C9 C8 112.35(19) . . ?
C9 C11 C12 112.32(19) . . ?
C13 C12 C11 110.83(18) . . ?
C12 C13 C18 109.71(17) . . ?
C12 C13 C14 107.20(17) . . ?
C18 C13 C14 113.41(16) . . ?
C12 C13 C17 117.92(16) . . ?
C18 C13 C17 109.53(17) . . ?
C14 C13 C17 98.78(15) . . ?
C15 C14 C8 119.33(18) . . ?
C15 C14 C13 104.47(16) . . ?
C8 C14 C13 116.60(17) . . ?
C14 C15 C16 103.58(17) . . ?
C15 C16 C17 107.30(17) . . ?
C20 C17 C16 112.79(17) . . ?
C20 C17 C13 119.43(16) . . ?
C16 C17 C13 102.61(15) . . ?
C22 C20 C21 111.28(17) . . ?
C22 C20 C17 110.10(16) . . ?
C21 C20 C17 114.81(18) . . ?
C23 C21 C20 116.1(2) . . ?
O22 C22 C20 112.5(2) . . ?
O23 C23 C21 111.8(2) . . ?

_diffrn_measured_fraction_theta_max 0.988
_diffrn_reflns_theta_full        25.00
_diffrn_measured_fraction_theta_full 0.999
_refine_diff_density_max         0.122
_refine_diff_density_min         -0.171
_refine_diff_density_rms         0.034
