1,5,7,11-Tetraoxaspiro[5.5]undecane, 3,9-Dimethylidene-1,5,7,11-tetraoxaspiro[5.5]undecane and 1,5-Dioxa-7,11-dithiaspiro[5.5]undecane
Bromley, Mark K.; Looney, Mark G.; Solomon, David H.; Gable, Robert W.; Helliwell, Madeleine; Hodge, Philip; Acta Crystallographica Section C 54 (1998) 1019–1023; doi:10.1107/S0108270198000274

data_2007470
_publ_section_title
;
 1,5,7,11-Tetraoxaspiro[5.5]undecane,
 3,9-Dimethylidene-1,5,7,11-tetraoxaspiro[5.5]undecane and
 1,5-Dioxa-7,11-dithiaspiro[5.5]undecane
;
_journal_issue                   7
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              1019
_journal_page_last               1023
_journal_paper_doi               10.1107/S0108270198000274
_journal_volume                  54
_journal_year                    1998
_chemical_formula_sum            'C7 H12 O4'
_chemical_formula_weight         160.17
_space_group_IT_number           60
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2n 2ab'
_symmetry_space_group_name_H-M   'P b c n'
_audit_creation_method           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.7068(11)
_cell_length_b                   10.1645(12)
_cell_length_c                   9.691(2)
_cell_measurement_reflns_used    16
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      15.8
_cell_measurement_theta_min      12.0
_cell_volume                     759.2(2)
_computing_cell_refinement       'MSC/AFC Diffractometer Control Software'
_computing_data_collection
;
MSC/AFC Diffractometer Control Software
(Molecular Structure Corporation, 1994)
;
_computing_data_reduction
'TEXSAN (Molecular Structure Corporation, 1995)'
_computing_molecular_graphics    TEXSAN
_computing_publication_material  TEXSAN
_computing_structure_refinement  'SHELXL93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measurement_device       'Rigaku AFC-5R'
_diffrn_measurement_method       \w-2\q
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Rigaku rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71069
_diffrn_reflns_av_R_equivalents  0.000
_diffrn_reflns_av_sigmaI/netI    0.019
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       0
_diffrn_reflns_limit_l_min       -11
_diffrn_reflns_number            672
_diffrn_reflns_theta_max         25.04
_diffrn_reflns_theta_min         3.32
_diffrn_standards_decay_%        0.71
_diffrn_standards_interval_count 150
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.116
_exptl_absorpt_correction_T_max  0.988
_exptl_absorpt_correction_T_min  0.969
_exptl_absorpt_correction_type   '\y scans (North et al., 1968)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.437
_exptl_crystal_density_meas      ?
_exptl_crystal_description       tabular
_exptl_crystal_F_000             360
_exptl_crystal_size_max          0.40
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.156
_refine_diff_density_min         -0.131
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   1.147
_refine_ls_goodness_of_fit_obs   1.193
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     75
_refine_ls_number_reflns         671
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.155
_refine_ls_restrained_S_obs      1.193
_refine_ls_R_factor_all          0.048
_refine_ls_R_factor_obs          .035
_refine_ls_shift/esd_max         0.000
_refine_ls_shift/esd_mean        0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w = 1/[\s^2^(Fo^2^)+(0.0406P)^2^+0.0735P] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.088
_refine_ls_wR_factor_obs         .079
_reflns_number_observed          533
_reflns_number_total             672
_reflns_observed_criterion       I>2\s(I)
_cod_data_source_file            os1000.cif
_cod_data_source_block           s476
_cod_depositor_comments
;
The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc w =
1/[\s^2^(Fo^2^)+(0.0406P)^2^+0.0735P] 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^)+(0.0406P)^2^+0.0735P] where P = (Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_database_code               2007470