Enantioselective Synthesis of Cyclobutenes by Intermolecular [2+2] Cycloaddition with Non-C2 Symmetric Digold Catalysts.
García-Morales, Cristina; Ranieri, Beatrice; Escofet, Imma; López-Suarez, Laura; Obradors, Carla; Konovalov, Andrey I.; Echavarren, Antonio M.; Journal of the American Chemical Society  (2017) –; doi:10.1021/jacs.7b07651

data_4126451
_publ_section_title
;
 Enantioselective Synthesis of Cyclobutenes by Intermolecular [2+2]
 Cycloaddition with Non-C2 Symmetric Digold Catalysts.
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_paper_doi               10.1021/jacs.7b07651
_journal_year                    2017
_chemical_absolute_configuration ad
_chemical_formula_sum            'C36 H42'
_chemical_formula_weight         474.69
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_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   mixed
_audit_creation_method           SHELXL-2014
_cell_angle_alpha                90
_cell_angle_beta                 115.627(4)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   15.4670(5)
_cell_length_b                   6.10912(17)
_cell_length_c                   16.5386(5)
_cell_measurement_reflns_used    22954
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      61.2180
_cell_measurement_theta_min      2.3720
_cell_volume                     1409.00(9)
_computing_cell_refinement       'CrystalClear-SM Expert 2.1 b29 (Rigaku, 2013)'
_computing_data_collection       'CrystalClear-SM Expert 2.1 b29 (Rigaku, 2013)'
_computing_data_reduction        'CrystalClear-SM Expert 2.1 b29 (Rigaku, 2013)'
_computing_molecular_graphics    'SHELXL-2014 (Sheldrick, 2014)'
_computing_publication_material  'SHELXL-2014 (Sheldrick, 2014)'
_computing_structure_refinement  'SHELXL-2014 (Sheldrick, 2014)'
_computing_structure_solution    Sir2011
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 5.8140
_diffrn_detector_type            'PILATUS 200K'
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.709
_diffrn_measurement_device_type  '1/4chi goniometer'
_diffrn_measurement_method
;
 Fullsphere data collection, phi and omega scans
;
_diffrn_measurement_specimen_support 'magnetic support with MicroMount'
_diffrn_radiation_monochromator  'Confocal Max Flux optic'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.7107
_diffrn_reflns_av_R_equivalents  0.0334
_diffrn_reflns_av_unetI/netI     0.0380
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.709
_diffrn_reflns_limit_h_max       38
_diffrn_reflns_limit_h_min       -25
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       37
_diffrn_reflns_limit_l_min       -41
_diffrn_reflns_number            59815
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.586
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         64.554
_diffrn_reflns_theta_min         2.392
_diffrn_source                   'Microfocus rotating anode X-ray tube'
_diffrn_source_current           24
_diffrn_source_power             50
_diffrn_source_size              '0.2 mm x 0.2 mm fine focus'
_diffrn_source_type              'Rigaku MicroMax-007HF'
_exptl_absorpt_coefficient_mu    0.062
_exptl_absorpt_correction_T_max  0.994
_exptl_absorpt_correction_T_min  0.765
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
; 
 CrystalClear-SM Expert 2.1 b29 (Rigaku, 2013)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.119
_exptl_crystal_description       Block
_exptl_crystal_F_000             516
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.1
_refine_diff_density_max         0.594
_refine_diff_density_min         -0.307
_refine_diff_density_rms         0.055
_refine_ls_abs_structure_details
;
 Flack x determined using 7441 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   5.2(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.725
_refine_ls_hydrogen_treatment    refU
_refine_ls_matrix_type           full
_refine_ls_number_parameters     485
_refine_ls_number_reflns         28367
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      0.725
_refine_ls_R_factor_all          0.0581
_refine_ls_R_factor_gt           0.0422
_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^)+(0.1000P)^2^+0.2204P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1199
_refine_ls_wR_factor_ref         0.1351
_reflns_Friedel_coverage         0.576
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     0.450
_reflns_number_gt                21428
_reflns_number_total             28367
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja7b07651_si_009.cif
_cod_data_source_block           CG-3-0574_P21
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/home/data/users/saulius/crontab/automatic-downloads/rss-feeds/ACS/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

'_exptl_absorpt_correction_type' value 'Multi-scan' changed to
'multi-scan' according to
/home/data/users/saulius/crontab/automatic-downloads/rss-feeds/ACS/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 4973 2017-02-22 13:04:09Z antanas 
;
_cod_original_cell_volume        1409.00(8)
_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               4126451
_shelx_estimated_absorpt_t_min   0.988
_shelx_estimated_absorpt_t_max   0.994
_shelxl_version_number           2014-3
_shelx_res_checksum              65571
_shelx_hkl_checksum              27166