Photochemistry of 1,n-Dibenzyloxy-9,10-anthraquinones
Saurav J. Sarma; Paul B. Jones; Journal of Organic Chemistry 75 (2010) 3806–3813; doi:10.1021/jo100650u

data_4025481
_publ_section_title
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 Photochemistry of 1,n-Dibenzyloxy-9,10-anthraquinones
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              3806
_journal_page_last               3813
_journal_paper_doi               10.1021/jo100650u
_journal_volume                  75
_journal_year                    2010
_chemical_formula_moiety         'C22 H16 O4'
_chemical_formula_sum            'C22 H16 O4'
_chemical_formula_weight         344.35
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXTL
_cell_angle_alpha                90.00
_cell_angle_beta                 108.757(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.720(2)
_cell_length_b                   16.457(3)
_cell_length_c                   8.8734(17)
_cell_measurement_reflns_used    2827
_cell_measurement_temperature    193(2)
_cell_measurement_theta_max      24.39
_cell_measurement_theta_min      3.88
_cell_volume                     1620.6(5)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'Bruker SHELXTL'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      193(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker APEX CCD area detector'
_diffrn_measurement_method       'phi and omega 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  0.0455
_diffrn_reflns_av_sigmaI/netI    0.0392
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            13235
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         26.00
_diffrn_reflns_theta_min         3.88
_exptl_absorpt_coefficient_mu    0.097
_exptl_absorpt_correction_T_max  0.8622
_exptl_absorpt_correction_T_min  0.6844
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
 Data were corrected for absorption effects using the 
 multi-scan technique (SADABS).  The estimated 
 minimum and maximum transmission:   0.6844  0.8622
;
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.411
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             720
_exptl_crystal_size_max          0.23
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.249
_refine_diff_density_min         -0.171
_refine_diff_density_rms         0.049
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.083
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     240
_refine_ls_number_reflns         3166
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.083
_refine_ls_R_factor_all          0.0692
_refine_ls_R_factor_gt           0.0538
_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^)+(0.0627P)^2^+0.3597P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1263
_refine_ls_wR_factor_ref         0.1340
_reflns_number_gt                2505
_reflns_number_total             3166
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo100650u_si_007.cif
_cod_data_source_block           a77p_35
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to the built-in table from CIF Core dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1646 2011-03-28 12:23:43Z adriana 
;
_cod_original_cell_volume        1620.5(5)
_cod_database_code               4025481