Unveiling the Takai Olefination Reagent via Tris( tert-butoxy)siloxy Variants.
Werner, Daniel; Anwander, Reiner; Journal of the American Chemical Society 140 (2018) 14334–14341; doi:10.1021/jacs.8b08739

data_4133166
_publ_section_title
;
 Unveiling the Takai Olefination Reagent via Tris( tert-butoxy)siloxy
 Variants.
;
_journal_issue                   43
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              14334
_journal_page_last               14341
_journal_paper_doi               10.1021/jacs.8b08739
_journal_volume                  140
_journal_year                    2018
_chemical_formula_moiety         'C41 H87 Cl2 Cr2 I O12 Si2'
_chemical_formula_sum            'C41 H87 Cl2 Cr2 I O12 Si2'
_chemical_formula_weight         1130.09
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     iterative
_atom_sites_solution_secondary   difmap
_audit_creation_date             2017-10-23
_audit_creation_method
;
Olex2 1.2
(compiled 2017.08.10 svn.r3458 for OlexSys, GUI svn.r5381)
;
_cell_angle_alpha                90.00
_cell_angle_beta                 109.3055(11)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   16.4739(12)
_cell_length_b                   17.6022(12)
_cell_length_c                   20.0801(14)
_cell_measurement_reflns_used    9817
_cell_measurement_temperature    100
_cell_measurement_theta_max      29.787
_cell_measurement_theta_min      2.267
_cell_volume                     5495.3(7)
_computing_cell_refinement       'SAINT V8.38A (Bruker-AXS, 2016)'
_computing_data_reduction        'SAINT V8.38A (Bruker-AXS, 2016)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'XL (Sheldrick, 2008)'
_computing_structure_solution
;
Superflip (Palatinus & Chapuis, 2007;Palatinus & van der Lee, 2008;
Palatinus et al., 2012)
;
_diffrn_ambient_temperature      100
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0765
_diffrn_reflns_av_unetI/netI     0.0462
_diffrn_reflns_limit_h_max       23
_diffrn_reflns_limit_h_min       -23
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       -24
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            121258
_diffrn_reflns_theta_full        30.08
_diffrn_reflns_theta_max         30.08
_diffrn_reflns_theta_min         1.39
_diffrn_source                   'fine-focus sealed tube'
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    1.149
_exptl_absorpt_correction_T_max  0.7460
_exptl_absorpt_correction_T_min  0.6566
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'SADABS-2016/2 (Bruker,2016/2) was used for absorption correction. wR2(int) was 0.1344 before and 0.0555 after correction. The Ratio of minimum to maximum transmission is 0.8802. The \l/2 correction factor is Not present.'
_exptl_crystal_colour            'clear red'
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_primary    red
_exptl_crystal_density_diffrn    1.366
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             2368
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.2
_exptl_crystal_size_min          0.1
_refine_diff_density_max         1.524
_refine_diff_density_min         -1.166
_refine_diff_density_rms         0.134
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.099
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     612
_refine_ls_number_reflns         16111
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.099
_refine_ls_R_factor_all          0.0726
_refine_ls_R_factor_gt           0.0439
_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^)+(0.0499P)^2^+5.2665P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0985
_refine_ls_wR_factor_ref         0.1152
_reflns_number_gt                11963
_reflns_number_total             16111
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja8b08739_si_003.cif
_cod_data_source_block           3
_cod_database_code               4133166
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H,H) groups, All C(H,H,H,H) groups
 At 1.5 times of:
  All C(H,H,H) groups
2. Others
 Sof(H26C)=Sof(H26D)=Sof(C27)=Sof(H27A)=Sof(H27B)=Sof(C28)=Sof(H28A)=Sof(H28B)=
 Sof(H29C)=Sof(H29D)=1-FVAR(1)
 Sof(C0AA)=Sof(H0AA)=Sof(H0AB)=Sof(C4AA)=Sof(H4AA)=Sof(H4AB)=Sof(H26A)=
 Sof(H26B)=Sof(H29A)=Sof(H29B)=FVAR(1)
 Fixed Sof: C19(0.5) H19A(0.5) H19B(0.5) H19C(0.5) C19A(0.5) H19D(0.5)
 H19E(0.5) H19F(0.5) C20(0.5) H20A(0.5) H20B(0.5) H20C(0.5) C20A(0.5) H20D(0.5)
 H20E(0.5) H20F(0.5) C21(0.5) H21A(0.5) H21B(0.5) H21C(0.5) C21A(0.5) H21D(0.5)
 H21E(0.5) H21F(0.5)
3.a Secondary CH2 refined with riding coordinates:
 C0AA(H0AA,H0AB), C4AA(H4AA,H4AB), C26(H26C,H26D), C26(H26A,H26B), C27(H27A,
 H27B), C28(H28A,H28B), C29(H29A,H29B), C29(H29C,H29D), C30(H30A,H30B),
 C31(H31A,H31B), C32(H32A,H32B), C33(H33A,H33B), C34(H34A,H34B), C35(H35A,H35B),
  C36(H36A,H36B), C37(H37A,H37B), C38(H38A,H38B), C39(H39A,H39B), C40(H40A,
 H40B), C41(H41A,H41B)
3.b Idealised Me refined as rotating group:
 C3(H3A,H3B,H3C), C4(H4A,H4B,H4C), C5(H5A,H5B,H5C), C7(H7A,H7B,H7C), C8(H8A,
 H8B,H8C), C9(H9A,H9B,H9C), C11(H11A,H11B,H11C), C12(H12A,H12B,H12C), C13(H13A,
 H13B,H13C), C15(H15A,H15B,H15C), C16(H16A,H16B,H16C), C17(H17A,H17B,H17C),
 C19(H19A,H19B,H19C), C19A(H19D,H19E,H19F), C20(H20A,H20B,H20C), C20A(H20D,H20E,
 H20F), C21(H21A,H21B,H21C), C21A(H21D,H21E,H21F), C23(H23A,H23B,H23C),
 C24(H24A,H24B,H24C), C25(H25A,H25B,H25C)
;
_olex2_submission_special_instructions 'No special instructions were received'