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_4025754
_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         'C19 H26 O4'
_chemical_formula_sum            'C19 H26 O4'
_chemical_formula_weight         318.40
_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                72.0390(10)
_cell_angle_beta                 83.4560(10)
_cell_angle_gamma                85.6640(12)
_cell_formula_units_Z            2
_cell_length_a                   7.8705(10)
_cell_length_b                   9.0108(11)
_cell_length_c                   12.0281(15)
_cell_measurement_reflns_used    3460
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      27.97
_cell_measurement_theta_min      4.21
_cell_volume                     805.43(17)
_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 0.981
_diffrn_measured_fraction_theta_max 0.972
_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  0.0143
_diffrn_reflns_av_sigmaI/netI    0.0228
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            7059
_diffrn_reflns_theta_full        26.50
_diffrn_reflns_theta_max         28.02
_diffrn_reflns_theta_min         4.22
_exptl_absorpt_coefficient_mu    0.091
_exptl_absorpt_correction_T_max  0.9955
_exptl_absorpt_correction_T_min  0.9530
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Sadabs (Bruker)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.313
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       platelet
_exptl_crystal_F_000             344
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.194
_refine_diff_density_min         -0.181
_refine_diff_density_rms         0.044
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.030
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     210
_refine_ls_number_reflns         3792
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.030
_refine_ls_R_factor_all          0.0482
_refine_ls_R_factor_gt           0.0407
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0513P)^2^+0.3372P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1026
_refine_ls_wR_factor_ref         0.1088
_reflns_number_gt                3264
_reflns_number_total             3792
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo101242e_si_003.cif
_cod_data_source_block           jung108s
_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 
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_cod_database_code               4025754