Cycloaddition of Cyclohexa-2,4-dienones, Ring-Closing Metathesis, and Photochemical Reactions: A Common Stereoselective Approach to Duprezianane, Polyquinane and Sterpurane Frameworks
Vishwakarma Singh; G. D. Praveena; Kapil Karki; Shaikh M. Mobin; Journal of Organic Chemistry 72 (2007) 2058–2067; doi:10.1021/jo062416m

data_4022771
_publ_section_title
;
 Cycloaddition of Cyclohexa-2,4-dienones, Ring-Closing Metathesis,
 and Photochemical Reactions: A Common Stereoselective Approach to
 Duprezianane, Polyquinane and Sterpurane Frameworks
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              2058
_journal_page_last               2067
_journal_paper_doi               10.1021/jo062416m
_journal_volume                  72
_journal_year                    2007
_chemical_formula_sum            'C26 H27 O4'
_chemical_formula_weight         403.48
_chemical_name_common
;
 11-Methyl-8-spiroepoxy-tricyclo[5.2.2.01,5]undec-3,10-dien-9-one
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 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                 91.167(7)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.4250(6)
_cell_length_b                   12.5710(10)
_cell_length_c                   20.3350(19)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      11.8200
_cell_measurement_theta_min      5.2800
_cell_volume                     2153.2(3)
_computing_cell_refinement       'Argus (Nonius, MACH3 software)'
_computing_data_collection       'Argus (Nonius, MACH3 software)'
_computing_data_reduction        'Maxus (Nonius software)'
_computing_molecular_graphics    Ortep
_computing_publication_material  Shelx97
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.941
_diffrn_measured_fraction_theta_max 0.941
_diffrn_measurement_device_type  'Nonius MACH3'
_diffrn_measurement_method       \w/q-scan
_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  0.1232
_diffrn_reflns_av_sigmaI/netI    0.3613
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       0
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            3836
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.00
_diffrn_standards_decay_%        <3%
_diffrn_standards_interval_time  3600
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.083
_exptl_absorpt_correction_T_max  0.9796
_exptl_absorpt_correction_T_min  0.9716
_exptl_absorpt_correction_type   psi-scan
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.245
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             860
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.175
_refine_diff_density_min         -0.215
_refine_diff_density_rms         0.047
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.911
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     371
_refine_ls_number_reflns         3727
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.911
_refine_ls_R_factor_all          0.3346
_refine_ls_R_factor_gt           0.0666
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0428P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1012
_refine_ls_wR_factor_ref         0.1500
_reflns_number_gt                1088
_reflns_number_total             3727
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo062416msi20061127_041921.cif
_cod_data_source_block           compound8A
_cod_depositor_comments
;
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 2.4.1 from
2010-06-29.

'_exptl_absorpt_correction_type' value 'Psi-scan' changed to
'psi-scan' 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 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0428P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.0428P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4022771