Crystal structures and conformations of two Diels–Alder adduct derivatives: 1,8-bis(thiophen-2-yl)-14-oxatetracyclo[6.5.1.0^2,7^.0^9,13^]tetradeca-2(7),3,5-trien-10-one and 1,8-diphenyl-14-oxatetracyclo[6.5.1.0^2,7^.0^9,13^] tetradeca-2,4,6-trien-10-one
Gopinath, S.; Narayanan, P.; Sethusankar, K.; Nandakumar, Meganathan; Mohanakrishnan, Arasambattu K.; Acta Crystallographica Section E 71 (2015) 213–216; doi:10.1107/S2056989015001073

data_2240421
_publ_section_title
;
 Crystal structures and conformations of two Diels--Alder adduct
 derivatives:
 1,8-bis(thiophen-2-yl)-14-oxatetracyclo[6.5.1.0^2,7^.0^9,13^]tetradeca-2(7),3,5-trien-10-one
 and 1,8-diphenyl-14-oxatetracyclo[6.5.1.0^2,7^.0^9,13^]
 tetradeca-2,4,6-trien-10-one
;
_journal_coeditor_code           BG2544
_journal_issue                   2
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              213
_journal_page_last               216
_journal_paper_doi               10.1107/S2056989015001073
_journal_volume                  71
_journal_year                    2015
_chemical_formula_moiety         'C25 H20 O2'
_chemical_formula_sum            'C25 H20 O2'
_chemical_formula_weight         352.41
_chemical_name_systematic
;
1,8-Diphenyl-14-oxatetracyclo[6.5.1.0^2,7^.0^9,13^] tetradeca-2,4,6-trien-10-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
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 91.583(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.8610(2)
_cell_length_b                   16.7327(5)
_cell_length_c                   14.2260(4)
_cell_measurement_reflns_used    4077
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      26.99
_cell_measurement_theta_min      1.88
_cell_volume                     1870.51(9)
_computing_cell_refinement
;
SAINT (Bruker, 2008)
;
_computing_data_collection
;
APEX2 (Bruker, 2008)
;
_computing_data_reduction
;
SAINT (Bruker, 2008)
;
_computing_molecular_graphics
;
ORTEP-3 for Windows (Farrugia, 2012) and Mercury (Macrae <i>et al.</i>,
2008)
;
_computing_publication_material
;
SHELXL97 (Sheldrick, 2015) and  PLATON  (Spek, 2009)
;
_computing_structure_refinement
;
SHELXL97 (Sheldrick, 2015)
;
_computing_structure_solution
;
SHELXS97 (Sheldrick, 2008)
;
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker APEXII CCD diffractometer'
_diffrn_measurement_method       '\w & \f scans'
_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  0.0301
_diffrn_reflns_av_sigmaI/netI    0.0272
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            16290
_diffrn_reflns_theta_full        26.99
_diffrn_reflns_theta_max         26.99
_diffrn_reflns_theta_min         1.88
_exptl_absorpt_coefficient_mu    0.078
_exptl_absorpt_correction_T_max  0.981
_exptl_absorpt_correction_T_min  0.973
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
(SADABS; Bruker, 2008)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.251
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             744
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.25
_refine_diff_density_max         0.435
_refine_diff_density_min         -0.255
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.019
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     266
_refine_ls_number_reflns         4077
_refine_ls_number_restraints     6
_refine_ls_restrained_S_all      1.019
_refine_ls_R_factor_all          0.0724
_refine_ls_R_factor_gt           0.0479
_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^)+(0.0536P)^2^+0.6324P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1195
_refine_ls_wR_factor_ref         0.1415
_reflns_number_gt                2892
_reflns_number_total             4077
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            bg2544sup1.cif
_cod_data_source_block           II
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               2240421
_cod_database_fobs_code          2240421