Studies toward the Total Syntheses of Cucurbitacins B and D
Michael E. Jung; Rebecca M. Lui; Journal of Organic Chemistry 75 (2010) 7146–7158; doi:10.1021/jo101242e

data_4025755
_publ_section_title
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 Studies toward the Total Syntheses of Cucurbitacins B and D
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_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              7146
_journal_page_last               7158
_journal_paper_doi               10.1021/jo101242e
_journal_volume                  75
_journal_year                    2010
_chemical_formula_moiety         'C26 H34 O6'
_chemical_formula_sum            'C26 H34 O6'
_chemical_formula_weight         442.53
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                98.395(3)
_cell_angle_beta                 102.435(3)
_cell_angle_gamma                117.966(2)
_cell_formula_units_Z            4
_cell_length_a                   13.449(2)
_cell_length_b                   14.006(3)
_cell_length_c                   14.786(5)
_cell_measurement_reflns_used    6580
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      27.98
_cell_measurement_theta_min      3.83
_cell_volume                     2301.7(10)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_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      100(2)
_diffrn_measured_fraction_theta_full 0.982
_diffrn_measured_fraction_theta_max 0.974
_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  0.0591
_diffrn_reflns_av_sigmaI/netI    0.0850
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            28162
_diffrn_reflns_theta_full        27.00
_diffrn_reflns_theta_max         28.15
_diffrn_reflns_theta_min         3.83
_exptl_absorpt_coefficient_mu    0.090
_exptl_absorpt_correction_T_max  0.9973
_exptl_absorpt_correction_T_min  0.9670
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Sadabs (Bruker)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.277
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             952
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.05
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.551
_refine_diff_density_min         -0.406
_refine_diff_density_rms         0.060
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.129
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     594
_refine_ls_number_reflns         10984
_refine_ls_number_restraints     11
_refine_ls_restrained_S_all      1.129
_refine_ls_R_factor_all          0.1577
_refine_ls_R_factor_gt           0.0827
_refine_ls_shift/su_max          0.005
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0912P)^2^+0.9102P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1968
_refine_ls_wR_factor_ref         0.2342
_reflns_number_gt                5709
_reflns_number_total             10984
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo101242e_si_004.cif
_cod_data_source_block           jung409sa-2
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
according to the built-in table from CIF Core dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1646 2011-03-28 12:23:43Z adriana 
;
_cod_original_cell_volume        2301.7(9)
_cod_database_code               4025755