Two new heterocyclic [3.3.3.0^1,5^]-propellanoid compounds: 2,8-dioxatricyclo[3.3.3.0^1,5^]undecane-3,7-dione and a related dimer
Tsao, Jonglin F.; Faruqi, Sana R.; Thompson, Hugh W.; Lalancette, Roger A.; Acta Crystallographica Section C 59 (2003) o57–o59; doi:10.1107/S0108270102022369

data_2013145
_publ_section_title
;
 Two new heterocyclic [3.3.3.0^1,5^]-propellanoid compounds:
 2,8-dioxatricyclo[3.3.3.0^1,5^]undecane-3,7-dione and a related dimer
;
_journal_issue                   2
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o57
_journal_page_last               o59
_journal_paper_doi               10.1107/S0108270102022369
_journal_volume                  59
_journal_year                    2003
_chemical_formula_moiety         'C18 H22 O7'
_chemical_formula_sum            'C18 H22 O7'
_chemical_formula_weight         350.36
_chemical_melting_point          465
_chemical_name_systematic
;
7,7'-Oxybis(2,8-dioxatricyclo[3.3.3.0^1,5^]undecan-3-one)
;
_space_group_IT_number           43
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'F 2 -2d'
_symmetry_space_group_name_H-M   'F d d 2'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL97
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            8
_cell_length_a                   11.571(5)
_cell_length_b                   27.069(10)
_cell_length_c                   10.754(5)
_cell_measurement_reflns_used    20
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      6.2
_cell_measurement_theta_min      2.7
_cell_volume                     3368(2)
_computing_cell_refinement       XSCANS
_computing_data_collection       'XSCANS (Siemens, 1996)'
_computing_data_reduction        XSCANS
_computing_molecular_graphics    SHELXTL
_computing_publication_material  SHELXTL
_computing_structure_refinement  SHELXTL
_computing_structure_solution    'SHELXTL (Sheldrick, 1997)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Siemens P4'
_diffrn_measurement_method       2\q/\q
_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  0.061
_diffrn_reflns_av_sigmaI/netI    0.084
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       32
_diffrn_reflns_limit_k_min       -32
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            1578
_diffrn_reflns_theta_full        24.99
_diffrn_reflns_theta_max         25.0
_diffrn_reflns_theta_min         2.69
_diffrn_standards_decay_%        'variation <1.6'
_diffrn_standards_interval_count 97
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.106
_exptl_absorpt_correction_T_max  0.99
_exptl_absorpt_correction_T_min  0.96
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details   '(SHELXTL; Sheldrick, 1997)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.382
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       parallelepiped
_exptl_crystal_F_000             1488
_exptl_crystal_size_max          0.44
_exptl_crystal_size_mid          0.38
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.11
_refine_diff_density_min         -0.13
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.00
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     114
_refine_ls_number_reflns         789
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.00
_refine_ls_R_factor_all          0.105
_refine_ls_R_factor_gt           0.050
_refine_ls_shift/su_max          <0.001
_refine_ls_shift/su_mean         0.00
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.0143P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.070
_refine_ls_wR_factor_ref         0.082
_reflns_number_gt                463
_reflns_number_total             789
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            fr1401.cif
_cod_data_source_block           II
_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 
;
_cod_database_code               2013145
_cod_database_fobs_code          2013145