Synthesis, structure, and properties of benzoquinone dimer and trimers bearing t-Bu substituents.
Hayashi, Naoto; Yoshikawa, Takahiro; Ohnuma, Takahiro; Higuchi, Hiroyuki; Sako, Katsuya; Uekusa, Hidehiro; Organic letters 9 (2007) 5417–5420; doi:10.1021/ol702289u

data_1505620
_publ_section_title
;
 Synthesis, structure, and properties of benzoquinone dimer and trimers
 bearing t-Bu substituents.
;
_journal_issue                   26
_journal_name_full               'Organic letters'
_journal_page_first              5417
_journal_page_last               5420
_journal_paper_doi               10.1021/ol702289u
_journal_volume                  9
_journal_year                    2007
_chemical_formula_sum            'C14 H20 O2'
_chemical_formula_weight         220.30
_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                 92.660(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   6.7308(8)
_cell_length_b                   10.0398(12)
_cell_length_c                   10.0115(12)
_cell_measurement_temperature    173(2)
_cell_volume                     675.81(14)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_detector_area_resol_mean 8.333
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Siemens SMART CCD'
_diffrn_measurement_method       \w-scan
_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  0.0590
_diffrn_reflns_av_sigmaI/netI    0.0314
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            8912
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         2.87
_exptl_absorpt_coefficient_mu    0.071
_exptl_absorpt_correction_T_max  0.6889
_exptl_absorpt_correction_T_min  1.0000
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_density_diffrn    1.083
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             240
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.286
_refine_diff_density_min         -0.137
_refine_diff_density_rms         0.041
_refine_ls_extinction_coef       0.061(14)
_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   1.045
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     105
_refine_ls_number_reflns         1547
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.045
_refine_ls_R_factor_all          0.0639
_refine_ls_R_factor_gt           0.0493
_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^)+(0.0757P)^2^+0.1171P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1304
_refine_ls_wR_factor_ref         0.1387
_reflns_number_gt                1180
_reflns_number_total             1547
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol702289u-file003.cif
_cod_data_source_block           dtbq
_cod_original_sg_symbol_H-M      P21/n
_cod_database_code               1505620