7b-<i>tert</i>-Butyl-1a,2,5,6-tetrahydro-2-hydroxy-2-methyl-4<i>H</i>-oxireno[2,3-<i>h</i>]chromen-3(7b<i>H</i>)-one
Chun-Hui Mao; Hai-Bin Song; Qing-Min Wang; Run-Qiu Huang; Li Chen; Jian Shang; Acta Crystallographica Section E 60 (2004) o2264–o2265; doi:10.1107/S1600536804028016

data_2204601
_publ_section_title
7b-<i>tert</i>-Butyl-1a,2,5,6-tetrahydro-2-hydroxy-2-methyl-4<i>H</i>-oxireno[2,3-<i>h</i>]chromen-3(7b<i>H</i>)-one
_journal_issue                   12
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              o2264
_journal_page_last               o2265
_journal_paper_doi               10.1107/S1600536804028016
_journal_volume                  60
_journal_year                    2004
_chemical_formula_iupac          'C14 H20 O4'
_chemical_formula_moiety         'C14 H20 O4'
_chemical_formula_sum            'C14 H20 O4'
_chemical_formula_weight         252.30
_chemical_name_systematic
;
7b-tert-Butyl-1a,2,5,6-tetrahydro-2-hydroxy-2-methyl-4H-
oxireno[2,3-h]chromen-3(7bH)-one
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90.00
_cell_angle_beta                 99.132(5)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.204(3)
_cell_length_b                   8.775(3)
_cell_length_c                   15.128(4)
_cell_measurement_reflns_used    972
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      25.73
_cell_measurement_theta_min      2.32
_cell_volume                     1337.4(7)
_computing_cell_refinement       'SAINT (Bruker, 1999)'
_computing_data_collection       'SMART (Bruker, 1998)'
_computing_data_reduction        SAINT
_computing_molecular_graphics    'SHELXTL (Bruker, 1999)'
_computing_publication_material  SHELXTL
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker SMART CCD area-detector'
_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  0.0370
_diffrn_reflns_av_sigmaI/netI    0.0451
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            7503
_diffrn_reflns_theta_full        26.45
_diffrn_reflns_theta_max         26.45
_diffrn_reflns_theta_min         2.25
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.091
_exptl_absorpt_correction_T_max  0.984
_exptl_absorpt_correction_T_min  0.960
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 1996)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.253
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             544
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.488
_refine_diff_density_min         -0.221
_refine_ls_extinction_coef       0.019(3)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.014
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     169
_refine_ls_number_reflns         2745
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.014
_refine_ls_R_factor_all          0.0943
_refine_ls_R_factor_gt           0.0534
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w = 1/[\s^2^(Fo^2^)+(0.0637P)^2^+0.4916P] where P = (Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1271
_refine_ls_wR_factor_ref         0.1468
_reflns_number_gt                1733
_reflns_number_total             2745
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ac6131.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 

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'none' 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_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               2204601
_cod_database_fobs_code          2204601