Enantioselective bromination/semipinacol rearrangement for the synthesis of β-bromoketones containing an all-α-carbon quaternary center
Li, Hui; Zhang, Fu-Min; Tu, Yong-Qiang; Zhang, Qing-Wei; Chen, Zhi-Min; Chen, Zhi-Hua; Li, Jian; Chemical Science 2 (2011) 1839–; doi:10.1039/c1sc00295c

data_1515662
_publ_section_title
;
 Enantioselective bromination/semipinacol rearrangement for the synthesis
 of \b-bromoketones containing an all-\a-carbon quaternary center
;
_journal_issue                   9
_journal_name_full               'Chemical Science'
_journal_page_first              1839
_journal_paper_doi               10.1039/c1sc00295c
_journal_volume                  2
_journal_year                    2011
_chemical_absolute_configuration none
_chemical_formula_sum            'C16 H15 Br O'
_chemical_formula_weight         303.19
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 98.728(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   12.363(5)
_cell_length_b                   6.388(3)
_cell_length_c                   17.867(8)
_cell_measurement_reflns_used    2223
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      19.12
_cell_measurement_theta_min      2.31
_cell_volume                     1394.7(11)
_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 0.997
_diffrn_measured_fraction_theta_max 0.997
_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  0.0475
_diffrn_reflns_av_sigmaI/netI    0.1028
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            9910
_diffrn_reflns_theta_full        25.20
_diffrn_reflns_theta_max         25.20
_diffrn_reflns_theta_min         2.31
_exptl_absorpt_coefficient_mu    2.933
_exptl_absorpt_correction_T_max  0.6674
_exptl_absorpt_correction_T_min  0.4020
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.444
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       stick
_exptl_crystal_F_000             616
_exptl_crystal_size_max          0.38
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.492
_refine_diff_density_min         -0.361
_refine_diff_density_rms         0.056
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.018(11)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.935
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     327
_refine_ls_number_reflns         4988
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.935
_refine_ls_R_factor_all          0.0925
_refine_ls_R_factor_gt           0.0473
_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^)+(0.0000P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0779
_refine_ls_wR_factor_ref         0.0901
_reflns_number_gt                3222
_reflns_number_total             4988
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c1sc00295c.txt
_cod_data_source_block           p21
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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      P2(1)
_cod_database_code               1515662