Rotationally-hindered furyl fulgides
Strübe, Frank; Mattay, Jochen; Neumann, Beate; Stammler, Hans-Georg; Acta Crystallographica Section C 67 (2011) o33–o36; doi:10.1107/S0108270110049401

data_2017931
_publ_section_title
;
 Rotationally-hindered furyl fulgides
;
_journal_coeditor_code           EG3067
_journal_issue                   1
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o33
_journal_page_last               o36
_journal_paper_doi               10.1107/S0108270110049401
_journal_volume                  67
_journal_year                    2011
_chemical_formula_iupac          'C18 H20 O4'
_chemical_formula_moiety         'C18 H20 O4'
_chemical_formula_sum            'C18 H20 O4'
_chemical_formula_weight         300.34
_chemical_name_systematic
;
3-[(<i>Z</i>)-1,3-dimethyl-5,6,7,8-tetrahydro-4<i>H</i>-\
cyclohepta[<i>c</i>]furan-4-ylidene]-4-isopropylidenetetrahydrofuran-2,5-dione
;
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
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_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   8.7024(2)
_cell_length_b                   12.8964(4)
_cell_length_c                   26.9492(7)
_cell_measurement_reflns_used    45246
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      27.485
_cell_measurement_theta_min      2.910
_cell_volume                     3024.50(14)
_computing_cell_refinement       'SCALEPACK (Otwinowski & Minor, 1997)'
_computing_data_collection       '<i>COLLECT</i> (Bruker, 2004)'
_computing_data_reduction
'SCALEPACK and DENZO (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'SHELXTL-Plus (Sheldrick, 2008)'
_computing_publication_material  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  KappaCCD
_diffrn_measurement_method       CCD
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
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_diffrn_reflns_limit_l_min       -34
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_diffrn_reflns_theta_full        27.43
_diffrn_reflns_theta_max         27.43
_diffrn_reflns_theta_min         2.92
_exptl_absorpt_coefficient_mu    0.092
_exptl_absorpt_correction_T_max  0.9764
_exptl_absorpt_correction_T_min  0.9728
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'(DENZO and SCALEPACK; Otwinowski & Minor, 1997)'
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.319
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       fragment
_exptl_crystal_F_000             1280
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.26
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_refine_diff_density_min         -0.192
_refine_ls_extinction_method     none
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_refine_ls_matrix_type           full
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_refine_ls_number_reflns         3444
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.033
_refine_ls_R_factor_all          0.0542
_refine_ls_R_factor_gt           0.0377
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0423P)^2^+0.8467P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
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_reflns_threshold_expression     I>2\s(I)
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_cod_database_code               2017931
_cod_database_fobs_code          2017931