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_4025478
_publ_section_title
;
 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         'C28 H18 O4'
_chemical_formula_sum            'C28 H18 O4'
_chemical_formula_weight         418.42
_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
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXTL
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   11.4683(16)
_cell_length_b                   9.2237(13)
_cell_length_c                   40.205(6)
_cell_measurement_reflns_used    2174
_cell_measurement_temperature    193(2)
_cell_measurement_theta_max      20.18
_cell_measurement_theta_min      4.05
_cell_volume                     4252.9(11)
_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  0.0919
_diffrn_reflns_av_sigmaI/netI    0.0521
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       48
_diffrn_reflns_limit_l_min       -48
_diffrn_reflns_number            31468
_diffrn_reflns_theta_full        25.35
_diffrn_reflns_theta_max         25.35
_diffrn_reflns_theta_min         4.05
_exptl_absorpt_coefficient_mu    0.087
_exptl_absorpt_correction_T_max  0.8620
_exptl_absorpt_correction_T_min  0.7258
_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:  0.7258  0.8620
;
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.307
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             1744
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.08
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.167
_refine_diff_density_min         -0.147
_refine_diff_density_rms         0.036
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.043
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     289
_refine_ls_number_reflns         3870
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.043
_refine_ls_R_factor_all          0.0962
_refine_ls_R_factor_gt           0.0570
_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^)+(0.0404P)^2^+1.7789P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1125
_refine_ls_wR_factor_ref         0.1280
_reflns_number_gt                2559
_reflns_number_total             3870
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo100650u_si_004.cif
_cod_data_source_block           a51p_27
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' 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        4252.9(10)
_cod_database_code               4025478