Asymmetric Desymmetrization of 1,3-Diketones via Intramolecular Benzoin Reaction.
Li, Yuanzhen; Yang, Shuang; Wen, Genfa; Lin, Qiqiao; Zhang, Guoxiang; Qiu, Lin; Zhang, Xiaoyan; Du, Guangfen; Fang, Xinqiang; The Journal of organic chemistry 81 (2016) 2763–2769; doi:10.1021/acs.joc.5b02829

data_4031935
_publ_section_title
;
 Asymmetric Desymmetrization of 1,3-Diketones via Intramolecular Benzoin
 Reaction.
;
_journal_issue                   7
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              2763
_journal_page_last               2769
_journal_paper_doi               10.1021/acs.joc.5b02829
_journal_volume                  81
_journal_year                    2016
_chemical_formula_sum            'C14 H15 F O3'
_chemical_formula_weight         250.26
_space_group_crystal_system      monoclinic
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014
_cell_angle_alpha                90
_cell_angle_beta                 92.156(3)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   7.0830(2)
_cell_length_b                   7.1796(2)
_cell_length_c                   11.8698(3)
_cell_measurement_reflns_used    1525
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      72.7870
_cell_measurement_theta_min      3.7230
_cell_volume                     603.19(3)
_computing_cell_refinement
;
CrysAlisPro, Agilent Technologies,
Version 1.171.37.35 (release 13-08-2014 CrysAlis171 .NET)
(compiled Aug 13 2014,18:06:01)
;
_computing_data_collection
;
CrysAlisPro, Agilent Technologies,
Version 1.171.37.35 (release 13-08-2014 CrysAlis171 .NET)
(compiled Aug 13 2014,18:06:01)
;
_computing_data_reduction
;
CrysAlisPro, Agilent Technologies,
Version 1.171.37.35 (release 13-08-2014 CrysAlis171 .NET)
(compiled Aug 13 2014,18:06:01)
;
_computing_structure_refinement  'SHELXL-2014 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXT-2014 (Sheldrick, 2014)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 10.5594
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.973
_diffrn_measurement_device_type  'SuperNova, Dual, Cu at zero, Atlas'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0121
_diffrn_reflns_av_unetI/netI     0.0180
_diffrn_reflns_Laue_measured_fraction_full 0.998
_diffrn_reflns_Laue_measured_fraction_max 0.973
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -5
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            2236
_diffrn_reflns_point_group_measured_fraction_full 0.661
_diffrn_reflns_point_group_measured_fraction_max 0.637
_diffrn_reflns_theta_full        67.684
_diffrn_reflns_theta_max         73.027
_diffrn_reflns_theta_min         3.727
_diffrn_source                   'sealed X-ray tube'
_exptl_absorpt_coefficient_mu    0.888
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.95238
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Agilent Technologies,
Version 1.171.37.35 (release 13-08-2014 CrysAlis171 .NET)
(compiled Aug 13 2014,18:06:01)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.378
_exptl_crystal_description       prism
_exptl_crystal_F_000             264
_exptl_crystal_size_max          0.240
_exptl_crystal_size_mid          0.230
_exptl_crystal_size_min          0.200
_refine_diff_density_max         0.257
_refine_diff_density_min         -0.211
_refine_diff_density_rms         0.038
_refine_ls_abs_structure_details
;
 Flack x determined using 252 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.11(13)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.058
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     167
_refine_ls_number_reflns         1535
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.058
_refine_ls_R_factor_all          0.0313
_refine_ls_R_factor_gt           0.0295
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0517P)^2^+0.0980P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0808
_refine_ls_wR_factor_ref         0.0827
_reflns_Friedel_coverage         0.209
_reflns_Friedel_fraction_full    0.259
_reflns_Friedel_fraction_max     0.240
_reflns_number_gt                1472
_reflns_number_total             1535
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jo5b02829_si_001.cif
_cod_data_source_block           compound-2
_cod_database_code               4031935
_shelx_estimated_absorpt_t_min   0.815
_shelx_estimated_absorpt_t_max   0.842
_shelxl_version_number           2014-3
_shelx_res_checksum              4061
_shelx_hkl_checksum              82807