Synthetic access to bent polycycles by cation-pi cyclization.
Shenvi, Ryan A.; Corey, E. J.; Organic letters 12 (2010) 3548–3551; doi:10.1021/ol101410g

data_1503114
_publ_section_title
;
 Synthetic access to bent polycycles by cation-pi cyclization.
;
_journal_issue                   15
_journal_name_full               'Organic letters'
_journal_page_first              3548
_journal_page_last               3551
_journal_paper_doi               10.1021/ol101410g
_journal_volume                  12
_journal_year                    2010
_chemical_absolute_configuration ad
_chemical_formula_sum            'C58 H68 Br4 O7'
_chemical_formula_weight         1196.76
_space_group_IT_number           4
_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   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 104.272(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   19.335(2)
_cell_length_b                   7.4272(10)
_cell_length_c                   20.267(3)
_cell_measurement_reflns_used    12458
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      27.0
_cell_measurement_theta_min      2.56
_cell_volume                     2820.6(6)
_computing_cell_refinement       'SAINT 7.46A (Bruker-AXS, 2009)'
_computing_data_collection       'APEX2 v2009.3.0 (Bruker-AXS, 2009)'
_computing_data_reduction        'SAINT 7.46A (Bruker-AXS, 2009)'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_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  0.0763
_diffrn_reflns_av_sigmaI/netI    0.0993
_diffrn_reflns_limit_h_max       23
_diffrn_reflns_limit_h_min       -24
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            33724
_diffrn_reflns_theta_full        27.11
_diffrn_reflns_theta_max         27.11
_diffrn_reflns_theta_min         1.68
_exptl_absorpt_coefficient_mu    2.903
_exptl_absorpt_correction_T_max  0.8927
_exptl_absorpt_correction_T_min  0.3752
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.409
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             1224
_exptl_crystal_size_max          0.42
_exptl_crystal_size_mid          0.06
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.737
_refine_diff_density_min         -0.691
_refine_diff_density_rms         0.104
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.001(9)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.029
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     675
_refine_ls_number_reflns         12442
_refine_ls_number_restraints     81
_refine_ls_restrained_S_all      1.027
_refine_ls_R_factor_all          0.0924
_refine_ls_R_factor_gt           0.0559
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0560P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1243
_refine_ls_wR_factor_ref         0.1317
_reflns_number_gt                7776
_reflns_number_total             12442
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol101410g_si_003.cif
_cod_data_source_block           RAS-913-2
_cod_depositor_comments
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The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to /home/saulius/struct/CIF-dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
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_cod_original_sg_symbol_H-M      P21
_cod_database_code               1503114