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_7103728
_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                 90.682(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   5.565(3)
_cell_length_b                   11.204(7)
_cell_length_c                   16.075(10)
_cell_measurement_reflns_used    966
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      28.278
_cell_measurement_theta_min      2.534
_cell_volume                     1002.2(10)
_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  0.0312
_diffrn_reflns_av_sigmaI/netI    0.0237
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            9792
_diffrn_reflns_theta_full        28.28
_diffrn_reflns_theta_max         28.28
_diffrn_reflns_theta_min         1.27
_diffrn_standards_decay_%        0.07
_diffrn_standards_number         94
_exptl_absorpt_coefficient_mu    0.095
_exptl_absorpt_correction_T_max  0.995
_exptl_absorpt_correction_T_min  0.953
_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    1.327
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             428
_exptl_crystal_size_max          0.509
_exptl_crystal_size_mid          0.238
_exptl_crystal_size_min          0.051
_refine_diff_density_max         0.328
_refine_diff_density_min         -0.192
_refine_diff_density_rms         0.040
_refine_ls_abs_structure_details 'not reliably determined'
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.190
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     265
_refine_ls_number_reflns         2503
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.190
_refine_ls_R_factor_all          0.0402
_refine_ls_R_factor_gt           0.0349
_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^)+(0.05P)^2^+0.0P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0851
_refine_ls_wR_factor_ref         0.0876
_reflns_number_gt                2255
_reflns_number_total             2503
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b303362g.txt
_cod_data_source_block           mss26
_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               7103728