Unique Steric Effect of Geminal Bis(silane) To Control the High Exo-selectivity in Intermolecular Diels-Alder Reaction.
Liu, Zengjin; Lin, Xinglong; Yang, Na; Su, Zhishan; Hu, Changwei; Xiao, Peihong; He, Yanyang; Song, Zhenlei; Journal of the American Chemical Society 138 (2016) 1877–1883; doi:10.1021/jacs.5b09689

data_4129701
_publ_section_title
;
 Unique Steric Effect of Geminal Bis(silane) To Control the High
 Exo-selectivity in Intermolecular Diels-Alder Reaction.
;
_journal_issue                   6
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              1877
_journal_page_last               1883
_journal_paper_doi               10.1021/jacs.5b09689
_journal_volume                  138
_journal_year                    2016
_chemical_absolute_configuration unk
_chemical_formula_moiety         'C32 H53 N O3 Si2'
_chemical_formula_sum            'C32 H53 N O3 Si2'
_chemical_formula_weight         555.93
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     iterative
_atom_sites_solution_secondary   difmap
_audit_creation_date             2013-11-09
_audit_creation_method
;
Olex2 1.2
(compiled 2013.09.17 svn.r2790 for OlexSys, GUI svn.r4601)
;
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.6338(6)
_cell_length_b                   40.258(4)
_cell_length_c                   9.8293(6)
_cell_measurement_reflns_used    3350
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      19.5390
_cell_measurement_theta_min      3.4810
_cell_volume                     3416.5(5)
_computing_cell_refinement
;
CrysAlisPro, Agilent Technologies,
Version 1.171.36.28 (release 01-02-2013 CrysAlis171 .NET)
(compiled Feb  1 2013,16:14:44)
;
_computing_data_collection
;
CrysAlisPro, Agilent Technologies,
Version 1.171.36.28 (release 01-02-2013 CrysAlis171 .NET)
(compiled Feb  1 2013,16:14:44)
;
_computing_data_reduction
;
CrysAlisPro, Agilent Technologies,
Version 1.171.36.28 (release 01-02-2013 CrysAlis171 .NET)
(compiled Feb  1 2013,16:14:44)
;
_computing_molecular_graphics
;
O. V. Dolomanov, L. J. Bourhis, R. J. Gildea, J. A. K. Howard and H. Puschmann,
OLEX2: a complete structure solution, refinement and analysis program.
J. Appl. Cryst. (2009). 42, 339-341.
;
_computing_publication_material
;
O. V. Dolomanov, L. J. Bourhis, R. J. Gildea, J. A. K. Howard and H. Puschmann,
OLEX2: a complete structure solution, refinement and analysis program.
J. Appl. Cryst. (2009). 42, 339-341.
;
_computing_structure_refinement
;
SHELX, G.M. Sheldrick, Acta Cryst.
(2008). A64, 112-122
;
_computing_structure_solution    'SUPERFLIP, J. Appl. Cryst. (2007) 40, 786-790'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 16.0733
_diffrn_measured_fraction_theta_full 0.9965
_diffrn_measured_fraction_theta_max 0.9198
_diffrn_measurement_device_type  'SuperNova, Dual, Cu at zero, Eos'
_diffrn_measurement_method       '\w scans'
_diffrn_orient_matrix_UB_11      -0.0450455000
_diffrn_orient_matrix_UB_12      0.0146711000
_diffrn_orient_matrix_UB_13      -0.0054441000
_diffrn_orient_matrix_UB_21      -0.0686901000
_diffrn_orient_matrix_UB_22      -0.0096091000
_diffrn_orient_matrix_UB_23      0.0039016000
_diffrn_orient_matrix_UB_31      0.0003311000
_diffrn_orient_matrix_UB_32      0.0016449000
_diffrn_orient_matrix_UB_33      0.0718550000
_diffrn_radiation_monochromator  mirror
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.7107
_diffrn_reflns_av_R_equivalents  0.1027
_diffrn_reflns_av_unetI/netI     0.1191
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       49
_diffrn_reflns_limit_k_min       -49
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            24175
_diffrn_reflns_theta_full        25.99
_diffrn_reflns_theta_max         25.99
_diffrn_reflns_theta_min         2.89
_diffrn_source                   'SuperNova (Mo) X-ray Source'
_exptl_absorpt_coefficient_mu    0.133
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.49437
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Agilent Technologies,
Version 1.171.36.28 (release 01-02-2013 CrysAlis171 .NET)
(compiled Feb  1 2013,16:14:44)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            'clear light colourless'
_exptl_crystal_density_diffrn    1.081
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             1216
_exptl_crystal_size_max          0.3900
_exptl_crystal_size_mid          0.2600
_exptl_crystal_size_min          0.2400
_refine_diff_density_max         0.220
_refine_diff_density_min         -0.212
_refine_diff_density_rms         0.038
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.0(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.917
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     350
_refine_ls_number_reflns         6735
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.917
_refine_ls_R_factor_all          0.1475
_refine_ls_R_factor_gt           0.0744
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1691
_refine_ls_wR_factor_ref         0.2154
_reflns_number_gt                3482
_reflns_number_total             6735
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja5b09689_si_002.cif
_cod_data_source_block           songzhl1018_2
_cod_original_cell_volume        3416.4(5)
_cod_database_code               4129701
_reflns_odcompleteness_completeness 99.65
_reflns_odcompleteness_iscentric 1
_reflns_odcompleteness_theta     26.32
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2.a Ternary CH refined with riding coordinates:
 C8(H8), C12(H12), C13(H13), C20(H20)
2.b Secondary CH2 refined with riding coordinates:
 C7(H7A,H7B), C9(H9A,H9B), C16(H16A,H16B), C17(H17A,H17B), C18(H18A,H18B),
 C21(H21A,H21B), C23(H23A,H23B), C25(H25A,H25B), C27(H27A,H27B), C29(H29A,H29B),
  C31(H31A,H31B)
2.c Aromatic/amide H refined with riding coordinates:
 C1(H1), C2(H2), C3(H3), C4(H4), C5(H5), C14(H14)
2.d Idealised Me refined as rotating group:
 C19(H19A,H19B,H19C), C22(H22A,H22B,H22C), C24(H24A,H24B,H24C), C26(H26A,H26B,
 H26C), C28(H28A,H28B,H28C), C30(H30A,H30B,H30C), C32(H32A,H32B,H32C)
;