A Catalytic Method for the Preparation of Polysubstituted Cyclopentanes: [3+2] Cycloaddition of Vinylidenecyclopropanes with Activated Olefins Catalyzed by Triflic Imide
Wei Li; Min Shi; Journal of Organic Chemistry 74 (2009) 856–860; doi:10.1021/jo802294s

data_4024273
_publ_section_title
;
A Catalytic Method for the Preparation of Polysubstituted Cyclopentanes:
[3+2] Cycloaddition of Vinylidenecyclopropanes with Activated Olefins
Catalyzed by Triflic Imide
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              856
_journal_page_last               860
_journal_paper_doi               10.1021/jo802294s
_journal_volume                  74
_journal_year                    2009
_chemical_absolute_configuration ad
_chemical_formula_sum            'C25 H28 O'
_chemical_formula_weight         344.47
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.5888(8)
_cell_length_b                   15.6047(17)
_cell_length_c                   17.3915(19)
_cell_measurement_reflns_used    2239
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      40.744
_cell_measurement_theta_min      4.684
_cell_volume                     2059.5(4)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_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      293(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0604
_diffrn_reflns_av_sigmaI/netI    0.0482
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       19
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            11972
_diffrn_reflns_theta_full        27.00
_diffrn_reflns_theta_max         27.00
_diffrn_reflns_theta_min         1.75
_exptl_absorpt_coefficient_mu    0.066
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.75578
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.111
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prismatic
_exptl_crystal_F_000             744
_exptl_crystal_size_max          0.426
_exptl_crystal_size_mid          0.394
_exptl_crystal_size_min          0.321
_refine_diff_density_max         0.133
_refine_diff_density_min         -0.116
_refine_diff_density_rms         0.029
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -10(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.995
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     240
_refine_ls_number_reflns         2570
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.995
_refine_ls_R_factor_all          0.0756
_refine_ls_R_factor_gt           0.0523
_refine_ls_shift/su_max          0.021
_refine_ls_shift/su_mean         0.003
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0655P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1155
_refine_ls_wR_factor_ref         0.1254
_reflns_number_gt                1865
_reflns_number_total             2570
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo802294s_si_003.cif
_cod_data_source_block           cd27625
_cod_depositor_comments
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The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
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_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               4024273