Asymmetric Synthesis of Cyclobutanone via Lewis Acid Catalyzed Tandem Cyclopropanation/Semipinacol Rearrangement.
Shim, Su Yong; Choi, Yuna; Ryu, Do Hyun; Journal of the American Chemical Society 140 (2018) 11184–11188; doi:10.1021/jacs.8b06835

data_4132828
_publ_section_title
;
 Asymmetric Synthesis of Cyclobutanone via Lewis Acid Catalyzed Tandem
 Cyclopropanation/Semipinacol Rearrangement.
;
_journal_issue                   36
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              11184
_journal_page_last               11188
_journal_paper_doi               10.1021/jacs.8b06835
_journal_volume                  140
_journal_year                    2018
_chemical_absolute_configuration ab
_chemical_formula_moiety         'C17 H32 O4 Si'
_chemical_formula_sum            'C17 H32 O4 Si'
_chemical_formula_weight         328.51
_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
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.6162(3)
_cell_length_b                   11.1763(4)
_cell_length_c                   19.1286(7)
_cell_measurement_reflns_used    9295
_cell_measurement_temperature    223(2)
_cell_measurement_theta_max      25.14
_cell_measurement_theta_min      2.79
_cell_volume                     2055.82(12)
_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-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      223(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'PHOTON 100 CMOS'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0685
_diffrn_reflns_av_unetI/netI     0.0253
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            76858
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         28.331
_diffrn_reflns_theta_min         2.110
_exptl_absorpt_coefficient_mu    0.128
_exptl_absorpt_correction_T_max  0.7457
_exptl_absorpt_correction_T_min  0.7179
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Bruker SADABS'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.061
_exptl_crystal_description       Block
_exptl_crystal_F_000             720
_exptl_crystal_size_max          0.260
_exptl_crystal_size_mid          0.150
_exptl_crystal_size_min          0.100
_refine_diff_density_max         0.215
_refine_diff_density_min         -0.240
_refine_diff_density_rms         0.036
_refine_ls_abs_structure_details
; 
 Flack x determined using 1295 quotients [(I+)-(I-)]/[(I+)+(I-)] 
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259). 
;
_refine_ls_abs_structure_Flack   0.00(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.035
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     206
_refine_ls_number_reflns         5121
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.035
_refine_ls_R_factor_all          0.0813
_refine_ls_R_factor_gt           0.0511
_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^)+(0.0512P)^2^+0.5463P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1123
_refine_ls_wR_factor_ref         0.1283
_reflns_Friedel_coverage         0.766
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     0.999
_reflns_number_gt                3706
_reflns_number_total             5121
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja8b06835_si_001.cif
_cod_data_source_block           No1
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_exptl_absorpt_correction_type' value 'Multi-scan' was
changed to 'multi-scan' in accordance with the
/home/saulius/struct/COD-crude-data/automatic-downloads/DataCite-retrospective/ACS/depositions/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 last updated on
2011-04-26.

Automatic conversion script
Id: cif_fix_values 6909 2019-04-08 15:41:33Z antanas 
;
_cod_database_code               4132828
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.968
_shelx_estimated_absorpt_t_max   0.987
_shelx_res_checksum              16757
_shelx_hkl_checksum              82572