Asymmetric construction of spirocyclopentenebenzofuranone core structures via highly selective phosphine-catalyzed [3 + 2] cycloaddition reactions.
Albertshofer, Klaus; Tan, Bin; Barbas, 3rd, Carlos F; Organic letters 15 (2013) 2958–2961; doi:10.1021/ol401087a

data_1556162
_publ_section_title
;
 Asymmetric construction of spirocyclopentenebenzofuranone core structures
 via highly selective phosphine-catalyzed [3 + 2] cycloaddition reactions.
;
_journal_issue                   12
_journal_name_full               'Organic letters'
_journal_page_first              2958
_journal_page_last               2961
_journal_paper_doi               10.1021/ol401087a
_journal_volume                  15
_journal_year                    2013
_chemical_absolute_configuration ad
_chemical_formula_sum            'C24 H22 O6'
_chemical_formula_weight         406.42
_space_group_IT_number           170
_space_group_name_Hall           'P 65'
_space_group_name_H-M_alt        'P 65'
_symmetry_cell_setting           hexagonal
_symmetry_space_group_name_H-M   'P 65'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                120.00
_cell_formula_units_Z            6
_cell_length_a                   19.1393(3)
_cell_length_b                   19.1393(3)
_cell_length_c                   10.2697(2)
_cell_measurement_reflns_used    5763
_cell_measurement_temperature    200(2)
_cell_measurement_theta_max      63.79
_cell_measurement_theta_min      2.67
_cell_volume                     3257.92(10)
_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-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      200(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0441
_diffrn_reflns_av_sigmaI/netI    0.0339
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            16995
_diffrn_reflns_theta_full        64.34
_diffrn_reflns_theta_max         64.34
_diffrn_reflns_theta_min         2.67
_exptl_absorpt_coefficient_mu    0.736
_exptl_absorpt_correction_T_max  0.9300
_exptl_absorpt_correction_T_min  0.7776
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.243
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       rod
_exptl_crystal_F_000             1284
_exptl_crystal_size_max          0.36
_exptl_crystal_size_mid          0.17
_exptl_crystal_size_min          0.10
_platon_squeeze_details
; 
 SQUEEZE (PLATON, A.Spek) was used to treat diffuse solvent and anion 
 contributions.  Total electron count found = 57/unit cell.
;
_refine_diff_density_max         0.136
_refine_diff_density_min         -0.149
_refine_diff_density_rms         0.030
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.05(17)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.064
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     271
_refine_ls_number_reflns         3608
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.064
_refine_ls_R_factor_all          0.0381
_refine_ls_R_factor_gt           0.0336
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0400P)^2^+0.4000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0789
_refine_ls_wR_factor_ref         0.0813
_reflns_number_gt                3301
_reflns_number_total             3608
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol401087a_si_003.cif
_cod_data_source_block           barbas28
_cod_depositor_comments
;
The following automatic conversions were performed:

data item '_symmetry_cell_setting' value 'Hexagonal' was changed to
'hexagonal' 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_original_sg_symbol_H-M      P6(5)
_cod_database_code               1556162