Catalytic intermolecular carbon electrophile induced semipinacol rearrangement
Qing-Wei Zhang; Xiao-Bo Zhang; Bao-Sheng Li; Kai Xiang; Fu-Min Zhang; Shao-Hua Wang; Yong-Qiang Tu; Chemical communications (Cambridge, England) 49 (2013) 1648–1650; doi:10.1039/c2cc38585f

data_7108856
_publ_section_title
;
 Catalytic intermolecular carbon electrophile induced semipinacol
 rearrangement
;
_journal_issue                   16
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              1648
_journal_page_last               1650
_journal_paper_doi               10.1039/c2cc38585f
_journal_volume                  49
_journal_year                    2013
_chemical_formula_sum            'C25 H37 Br N2 O6 Si'
_chemical_formula_weight         569.57
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                75.487(11)
_cell_angle_beta                 79.846(12)
_cell_angle_gamma                81.246(11)
_cell_formula_units_Z            4
_cell_length_a                   8.055(9)
_cell_length_b                   17.91(2)
_cell_length_c                   20.02(2)
_cell_measurement_reflns_used    2908
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      19.95
_cell_measurement_theta_min      2.37
_cell_volume                     2734(5)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.987
_diffrn_measured_fraction_theta_max 0.987
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0600
_diffrn_reflns_av_sigmaI/netI    0.1233
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            19301
_diffrn_reflns_theta_full        25.20
_diffrn_reflns_theta_max         25.20
_diffrn_reflns_theta_min         2.18
_exptl_absorpt_coefficient_mu    1.588
_exptl_absorpt_correction_T_max  0.7214
_exptl_absorpt_correction_T_min  0.6922
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.384
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1192
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.23
_exptl_crystal_size_min          0.22
_refine_diff_density_max         0.480
_refine_diff_density_min         -0.594
_refine_diff_density_rms         0.083
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.057
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     643
_refine_ls_number_reflns         9729
_refine_ls_number_restraints     31
_refine_ls_restrained_S_all      1.062
_refine_ls_R_factor_all          0.1507
_refine_ls_R_factor_gt           0.0698
_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^+0.2808P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1858
_refine_ls_wR_factor_ref         0.2174
_reflns_number_gt                4894
_reflns_number_total             9729
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2cc38585f.txt
_cod_data_source_block           p-1
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
according to
/usr/data/users/saulius/automatic-downloads/retrospective/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 
;
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               7108856