7,11,18,21-Tetraoxatrispiro[5.2.2.5.2.2]heneicosane
Shi, Jiang-Hua; Yuan, Xian-You; Zhang, Min; Ng, Seik Weng; Acta Crystallographica Section E 65 (2009) o2712–; doi:10.1107/S1600536809040884

data_2224037
_publ_section_title
;
 7,11,18,21-Tetraoxatrispiro[5.2.2.5.2.2]heneicosane
;
_journal_coeditor_code           TK2552
_journal_issue                   11
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o2712
_journal_paper_doi               10.1107/S1600536809040884
_journal_volume                  65
_journal_year                    2009
_chemical_formula_iupac          'C17 H28 O4'
_chemical_formula_moiety         'C17 H28 O4'
_chemical_formula_sum            'C17 H28 O4'
_chemical_formula_weight         296.39
_chemical_name_systematic
;
7,11,18,21-Tetraoxatrispiro[5.2.2.5.2.2]heneicosane
;
_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
_cell_angle_beta                 118.0020(10)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   11.1256(5)
_cell_length_b                   13.9106(7)
_cell_length_c                   11.6500(6)
_cell_measurement_reflns_used    6307
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      27.1
_cell_measurement_theta_min      2.1
_cell_volume                     1591.92(14)
_computing_cell_refinement       'SAINT (Bruker, 2003)'
_computing_data_collection       'SMART (Bruker, 1997)'
_computing_data_reduction        'SAINT (Bruker, 2003)'
_computing_molecular_graphics    'X-SEED (Barbour, 2001)'
_computing_publication_material  'publCIF (Westrip, 2009)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'Bruker SMART'
_diffrn_measurement_method       '\f and \w'
_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  0.031
_diffrn_reflns_av_sigmaI/netI    0.028
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            11846
_diffrn_reflns_theta_full        27.1
_diffrn_reflns_theta_max         27.1
_diffrn_reflns_theta_min         2.1
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.086
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.237
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Block
_exptl_crystal_F_000             648
_exptl_crystal_size_max          0.48
_exptl_crystal_size_mid          0.42
_exptl_crystal_size_min          0.26
_refine_diff_density_max         0.23
_refine_diff_density_min         -0.22
_refine_ls_abs_structure_details nd
_refine_ls_extinction_coef       0.118(7)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL97 (Sheldrick, 2008)'
_refine_ls_goodness_of_fit_ref   1.01
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     380
_refine_ls_number_reflns         3620
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.01
_refine_ls_R_factor_all          0.044
_refine_ls_R_factor_gt           0.039
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0742P)^2^+0.1289P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.104
_refine_ls_wR_factor_ref         0.110
_reflns_number_gt                3268
_reflns_number_total             3620
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            tk2552.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.

'_exptl_absorpt_correction_type' value 'None' changed to
'none' 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.

'_exptl_absorpt_correction_type' value 'None' changed to
'none' 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               2224037
_cod_database_fobs_code          2224037