Formation of an Endoperoxide upon Chromium-Catalyzed Allylic Oxidation of a Triterpene by Oxygen.
Chung, Abbie; Miner, Matthew R.; Richert, Kathleen J.; Rieder, Curtis J.; Woerpel, K. A.; The Journal of organic chemistry 80 (2014) 266–; doi:10.1021/jo502344x

data_4030294
_publ_section_title
;
 Formation of an Endoperoxide upon Chromium-Catalyzed Allylic Oxidation of
 a Triterpene by Oxygen.
;
_journal_issue                   1
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              266
_journal_paper_doi               10.1021/jo502344x
_journal_volume                  80
_journal_year                    2014
_chemical_absolute_configuration rm
_chemical_formula_sum            'C32 H48 O3'
_chemical_formula_weight         480.70
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_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
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_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
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_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.0603(9)
_cell_length_b                   16.009(2)
_cell_length_c                   23.988(3)
_cell_measurement_reflns_used    761
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      16.17
_cell_measurement_theta_min      2.68
_cell_volume                     2711.3(6)
_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, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\w 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  0.1605
_diffrn_reflns_av_sigmaI/netI    0.0971
_diffrn_reflns_limit_h_max       7
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_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            22276
_diffrn_reflns_theta_full        22.02
_diffrn_reflns_theta_max         22.02
_diffrn_reflns_theta_min         1.53
_exptl_absorpt_coefficient_mu    0.073
_exptl_absorpt_correction_T_max  0.9978
_exptl_absorpt_correction_T_min  0.9877
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.178
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             1056
_exptl_crystal_size_max          0.17
_exptl_crystal_size_mid          0.04
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.195
_refine_diff_density_min         -0.236
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_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -2(3)
_refine_ls_extinction_method     none
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_refine_ls_matrix_type           full
_refine_ls_number_parameters     324
_refine_ls_number_reflns         3337
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.020
_refine_ls_R_factor_all          0.1009
_refine_ls_R_factor_gt           0.0550
_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^)+(0.0549P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1077
_refine_ls_wR_factor_ref         0.1284
_reflns_number_gt                2307
_reflns_number_total             3337
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo502344x_si_005.cif
_cod_data_source_block           14kaw10h
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' according to
/home/saulius/struct/COD-crude-data--automatic-downloads/rss-feeds/ACS/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2935 2014-11-11 08:27:57Z andrius 

 Adding full bibliography for 4030293--4030296.cif.
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_cod_database_code               4030294