4,4-Dimethyl-3,5,8,10-tetraoxatricyclo[5.2.1.0^2,6^]decane
Light, Mark E.; Murphy, Patrick J.; Brown, Paul M.; Hursthouse, Michael B.; Acta Crystallographica Section E 58 (2002) o560–o561; doi:10.1107/S160053680200661X

data_2201223
_publ_section_title
;
 4,4-Dimethyl-3,5,8,10-tetraoxatricyclo[5.2.1.0^2,6^]decane
;
_journal_issue                   5
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o560
_journal_page_last               o561
_journal_paper_doi               10.1107/S160053680200661X
_journal_volume                  58
_journal_year                    2002
_chemical_formula_iupac          'C8 H12 O4'
_chemical_formula_moiety         'C8 H12 O4'
_chemical_formula_sum            'C8 H12 O4'
_chemical_formula_weight         172.18
_chemical_name_systematic
;
4,4-Dimethyl-3,5,8,10-tetraoxatricyclo[5.2.1.0^2,6^]decane
;
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_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                 113.000(7)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   8.1183(7)
_cell_length_b                   5.9280(5)
_cell_length_c                   9.0398(7)
_cell_measurement_reflns_used    3809
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      25.0
_cell_measurement_theta_min      4.2
_cell_volume                     400.46(6)
_computing_cell_refinement
'SCALEPACK (Otwinowski & Minor, 1997) and COLLECT (Hooft, 1998)'
_computing_data_collection       'COLLECT (Hooft, 1998)'
_computing_data_reduction
'DENZO (Otwinowski & Minor, 1997), COLLECT and MAXUS (Mackay et al., 1998)'
_computing_molecular_graphics    'CAMERON (Watkin et al., 1993)'
_computing_publication_material  'WINGX (Farrugia, 1998)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      120(2)
_diffrn_detector_area_resol_mean '9.091 pixels mm^1^'
_diffrn_measured_fraction_theta_full 0.992
_diffrn_measured_fraction_theta_max 0.992
_diffrn_measurement_device_type  'Bruker--Nonius KappaCCD area-detector'
_diffrn_measurement_method       '\f and \w scans to fill the asymmetric unit'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Bruker Nonius FR591 Rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.069
_diffrn_reflns_av_sigmaI/netI    0.053
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            3809
_diffrn_reflns_theta_full        25.0
_diffrn_reflns_theta_max         25.0
_diffrn_reflns_theta_min         4.2
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.115
_exptl_absorpt_correction_T_max  0.989
_exptl_absorpt_correction_T_min  0.977
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SORTAV; Blessing, 1997)'
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.428
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             184
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.16
_refine_diff_density_min         -0.17
_refine_ls_abs_structure_details 'Flack (1983) '
_refine_ls_extinction_coef       0.051(9)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL97
_refine_ls_goodness_of_fit_ref   1.03
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     112
_refine_ls_number_reflns         771
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.03
_refine_ls_R_factor_all          0.052
_refine_ls_R_factor_gt           0.033
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.0343P)^2^] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.063
_refine_ls_wR_factor_ref         0.069
_reflns_number_gt                620
_reflns_number_total             771
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ya6101.cif
_cod_data_source_block           I
_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.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 

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.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      'P 21'
_cod_database_code               2201223
_cod_database_fobs_code          2201223