The domino intramolecular Diels-Alder approach to 16-oxasteroids
Caig I Turner; Rachel M. Williamson; Peter Turner; Michael S. Sherburn; Chemical communications (Cambridge, England)  (2003) –; doi:10.1039/b303362g

data_7103727
_publ_section_title
;
The domino intramolecular Diels-Alder approach to
16-oxasteroids
;
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_paper_doi               10.1039/b303362g
_journal_year                    2003
_chemical_formula_sum            'C23 H28 O6'
_chemical_formula_weight         400.45
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      4
_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                 93.311(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   7.8232(15)
_cell_length_b                   8.2488(16)
_cell_length_c                   15.889(3)
_cell_measurement_reflns_used    872
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      26.094
_cell_measurement_theta_min      2.469
_cell_volume                     1023.7(3)
_computing_cell_refinement       'SAINT (Bruker,1995)'
_computing_data_collection       'SMART (Bruker,1995)'
_computing_data_reduction        'SAINT and XPREP (Bruker 1995)'
_computing_molecular_graphics
;
teXsan for Windows (MSC, 1997)
xtal 3.6 (Hall,du Boulay, D.J. & Olthof-Hazekamp, R. 1999)
ORTEPII  (Johnson,C.K., 1976).
WinGX (Farrugia, 1999)
;
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR97 (Altomare, et. al. 1997)'
_diffrn_ambient_temperature      150(2)
_diffrn_crystal_treatment
;
attached with Exxon Paratone N, to a short length
of fibre supported on a thin piece of copper wire
inserted in a copper mounting pin.  The crystal was
quenched in a cold nitrogen gas stream from an
Oxford Cryosystems Cryostream.
;
_diffrn_measured_fraction_theta_full 0.958
_diffrn_measured_fraction_theta_max 0.958
_diffrn_measurement_device_type  'Bruker SMART 1000 CCD'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0297
_diffrn_reflns_av_sigmaI/netI    0.0321
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            10059
_diffrn_reflns_theta_full        28.28
_diffrn_reflns_theta_max         28.28
_diffrn_reflns_theta_min         1.28
_diffrn_standards_decay_%        0.2
_diffrn_standards_number         71
_exptl_absorpt_coefficient_mu    0.093
_exptl_absorpt_correction_T_max  0.995
_exptl_absorpt_correction_T_min  0.966
_exptl_absorpt_correction_type   gaussian
_exptl_absorpt_process_details
;
Gaussian (Coppens et al., 1965)
XPREP  (Bruker, 1995)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.299
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       blade
_exptl_crystal_F_000             428
_exptl_crystal_size_max          0.398
_exptl_crystal_size_mid          0.212
_exptl_crystal_size_min          0.050
_refine_diff_density_max         0.185
_refine_diff_density_min         -0.196
_refine_diff_density_rms         0.034
_refine_ls_abs_structure_details
'Flack parameter refined to 0.0(7), so all reflections were then merged'
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.295
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     265
_refine_ls_number_reflns         2598
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.295
_refine_ls_R_factor_all          0.0485
_refine_ls_R_factor_gt           0.0354
_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^)+(0.0200P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0621
_refine_ls_wR_factor_ref         0.0641
_reflns_number_gt                2070
_reflns_number_total             2598
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b303362g.txt
_cod_data_source_block           mss25
_cod_depositor_comments
;
The following automatic conversions were performed:
'_exptl_absorpt_correction_type' value 'Gaussian' changed to 'gaussian'
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 
;
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               7103727