Enantioselective Coupling of Dienes and Phosphine Oxides.
Nie, Shao-Zhen; Davison, Ryan T.; Dong, Vy M.; Journal of the American Chemical Society 140 (2018) 16450–16454; doi:10.1021/jacs.8b11150

data_4133558
_publ_section_title
;
 Enantioselective Coupling of Dienes and Phosphine Oxides.
;
_journal_issue                   48
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              16450
_journal_page_last               16454
_journal_paper_doi               10.1021/jacs.8b11150
_journal_volume                  140
_journal_year                    2018
_chemical_absolute_configuration ad
_chemical_formula_sum            'C20 H25 O P'
_chemical_formula_weight         312.37
_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   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_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                   5.9083(9)
_cell_length_b                   13.523(2)
_cell_length_c                   21.616(3)
_cell_measurement_reflns_used    9866
_cell_measurement_temperature    88(2)
_cell_measurement_theta_max      29.01
_cell_measurement_theta_min      2.41
_cell_volume                     1727.1(4)
_computing_cell_refinement       'Bruker SAINT 8.34a, 2013'
_computing_data_collection       'Bruker APEX2 2014.11-0, 2014'
_computing_data_reduction        'Bruker SAINT 8.34a, 2013'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'Bruker SHELXTL 2014/4'
_diffrn_ambient_temperature      88(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.972
_diffrn_measurement_device_type  'Bruker SMART APEX II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0192
_diffrn_reflns_av_unetI/netI     0.0153
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.972
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       29
_diffrn_reflns_limit_l_min       -28
_diffrn_reflns_number            21305
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.949
_diffrn_reflns_theta_full        25.500
_diffrn_reflns_theta_max         29.095
_diffrn_reflns_theta_min         1.776
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    0.159
_exptl_absorpt_correction_T_max  0.7458
_exptl_absorpt_correction_T_min  0.7181
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Bruker SADABS 2014/5'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.201
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    not_measured
_exptl_crystal_description       irregular
_exptl_crystal_F_000             672
_exptl_crystal_size_max          0.404
_exptl_crystal_size_mid          0.322
_exptl_crystal_size_min          0.249
_refine_diff_density_max         0.302
_refine_diff_density_min         -0.178
_refine_diff_density_rms         0.039
_refine_ls_abs_structure_details
; 
 Flack x determined using 1748 quotients [(I+)-(I-)]/[(I+)+(I-)] 
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259). 
;
_refine_ls_abs_structure_Flack   -0.006(16)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.034
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     299
_refine_ls_number_reflns         4398
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.034
_refine_ls_R_factor_all          0.0253
_refine_ls_R_factor_gt           0.0246
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0452P)^2^+0.2810P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0671
_refine_ls_wR_factor_ref         0.0678
_reflns_Friedel_coverage         0.695
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     0.919
_reflns_number_gt                4300
_reflns_number_total             4398
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja8b11150_si_002.cif
_cod_data_source_block           vmd29
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_exptl_crystal_density_meas' value 'not_measured' was
changed to '?' -- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 6909 2019-04-08 15:41:33Z antanas 
;
_cod_original_cell_volume        1727.0(5)
_cod_database_code               4133558
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.938
_shelx_estimated_absorpt_t_max   0.961
_exptl_absorpt_special_details
; 
Reflections not merged 
21384 Corrected reflections written to file vmd29s.hkl 
Estimated minimum and maximum transmission:  0.7181  0.7458 
The ratio (0.9629) of these values is more reliable than their absolute values 
Additional spherical absorption correction applied with mu*r =  0.2000 
Lambda/2 correction factor = 0.00150 
;
_shelx_res_checksum              2568
_shelx_hkl_checksum              24394