Allenoates in Enantioselective [2+2] Cycloadditions: From a Mechanistic Curiosity to a Stereospecific Transformation.
Wiest, Johannes M.; Conner, Michael L.; Brown, M. Kevin; Journal of the American Chemical Society 140 (2018) 15943–15949; doi:10.1021/jacs.8b10008

data_4133433
_publ_section_title
;
 Allenoates in Enantioselective [2+2] Cycloadditions: From a Mechanistic
 Curiosity to a Stereospecific Transformation.
;
_journal_issue                   46
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              15943
_journal_page_last               15949
_journal_paper_doi               10.1021/jacs.8b10008
_journal_volume                  140
_journal_year                    2018
_chemical_formula_sum            'C13 H14 O2'
_chemical_formula_weight         202.24
_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   mixed
_audit_creation_method           SHELXL-2014/7
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   5.7660(5)
_cell_length_b                   17.9957(14)
_cell_length_c                   21.5234(15)
_cell_measurement_reflns_used    4504
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      67.93
_cell_measurement_theta_min      4.11
_cell_volume                     2233.3(3)
_computing_cell_refinement       'APEX II v2014.11-0 (Bruker, 2014)'
_computing_data_collection       'APEX II v2014.11-0 (Bruker, 2014)'
_computing_data_reduction        'APEX II v2014.11-0 (Bruker, 2014)'
_computing_molecular_graphics    'SHELXTL (Bruker, 2016)'
_computing_publication_material
'SHELXTL (Bruker, 2016)'_refine_special_details'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2016)'
_computing_structure_solution    'SHELX (Bruker, 2016)'
_diffrn_ambient_temperature      173(2)
_diffrn_detector                 'CCD area detector'
_diffrn_detector_area_resol_mean 83.33
_diffrn_detector_type            'Bruker APEXII'
_diffrn_measured_fraction_theta_full 0.981
_diffrn_measured_fraction_theta_max 0.973
_diffrn_measurement_details
'0.50 degree frames measured for 60 seconds each'
_diffrn_measurement_device       'APEX Kappa Duo'
_diffrn_measurement_device_type  Kappa
_diffrn_measurement_method       'omega and phi scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0371
_diffrn_reflns_av_unetI/netI     0.0351
_diffrn_reflns_Laue_measured_fraction_full 0.981
_diffrn_reflns_Laue_measured_fraction_max 0.973
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            12540
_diffrn_reflns_point_group_measured_fraction_full 0.954
_diffrn_reflns_point_group_measured_fraction_max 0.944
_diffrn_reflns_theta_full        67.679
_diffrn_reflns_theta_max         68.235
_diffrn_reflns_theta_min         4.108
_diffrn_source                   microfocus
_exptl_absorpt_coefficient_mu    0.640
_exptl_absorpt_correction_T_max  0.7531
_exptl_absorpt_correction_T_min  0.6046
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS, G. Sheldrick; 2016'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.203
_exptl_crystal_description       neddle
_exptl_crystal_F_000             864
_exptl_crystal_size_max          0.150
_exptl_crystal_size_mid          0.080
_exptl_crystal_size_min          0.050
_refine_diff_density_max         0.158
_refine_diff_density_min         -0.168
_refine_diff_density_rms         0.043
_refine_ls_abs_structure_details
;
 Flack x determined using 1339 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.10(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.068
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     281
_refine_ls_number_reflns         3851
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.068
_refine_ls_R_factor_all          0.0411
_refine_ls_R_factor_gt           0.0368
_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^)+(0.0538P)^2^+0.1790P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0908
_refine_ls_wR_factor_ref         0.0936
_reflns_Friedel_coverage         0.668
_reflns_Friedel_fraction_full    0.916
_reflns_Friedel_fraction_max     0.904
_reflns_number_gt                3545
_reflns_number_total             3851
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja8b10008_si_001.cif
_cod_data_source_block           17128
_cod_database_code               4133433
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.910
_shelx_estimated_absorpt_t_max   0.969
_shelx_res_checksum              43979
_shelx_hkl_checksum              46735