Monitoring structural transformations in crystals. 13. On photocyclization in 2,3,4,5,6-pentamethylbenzophenone, 1,3-diphenylbutan-1-one and 2,4,6-triisopropyl-4'-methoxybenzophenone
Bakowicz, Julia; Turowska-Tyrk, Ilona; Acta Crystallographica Section C 66 (2010) o29–o32; doi:10.1107/S0108270109052858

data_2017475
_publ_section_title
;
 Monitoring structural transformations in crystals. 13. On
 photocyclization in 2,3,4,5,6-pentamethylbenzophenone,
 1,3-diphenylbutan-1-one and 2,4,6-triisopropyl-4'-methoxybenzophenone
;
_journal_coeditor_code           GZ3170
_journal_issue                   1
_journal_name_full               'Acta Crystallographica Section C'
_journal_page_first              o29
_journal_page_last               o32
_journal_paper_doi               10.1107/S0108270109052858
_journal_volume                  66
_journal_year                    2010
_chemical_formula_iupac          'C18 H20 O'
_chemical_formula_moiety         'C18 H20 O'
_chemical_formula_sum            'C18 H20 O'
_chemical_formula_weight         252.34
_chemical_name_systematic
;
2,3,4,5,6-pentamethylbenzophenone
;
_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                 97.28(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.3784(15)
_cell_length_b                   12.793(2)
_cell_length_c                   18.014(5)
_cell_measurement_reflns_used    1312
_cell_measurement_temperature    299(2)
_cell_measurement_theta_max      20.68
_cell_measurement_theta_min      2.80
_cell_volume                     1458.1(6)
_computing_cell_refinement       'CrysAlis CCD (Oxford Diffraction, 2003)'
_computing_data_collection       'CrysAlis CCD (Oxford Diffraction, 2003)'
_computing_data_reduction        'CrysAlis RED (Oxford Diffraction, 2003)'
_computing_molecular_graphics    'ORTEP-3 for Windows (Farrugia, 1997)'
_computing_publication_material  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      299(2)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'Kuma KM-4 CCD diffractometer'
_diffrn_measurement_method       '\w 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  0.0356
_diffrn_reflns_av_sigmaI/netI    0.0309
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -3
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            7742
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         3.18
_exptl_absorpt_coefficient_mu    0.069
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.150
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             544
_exptl_crystal_size_max          0.60
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.13
_refine_diff_density_max         0.172
_refine_diff_density_min         -0.205
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.038
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     177
_refine_ls_number_reflns         2553
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.038
_refine_ls_R_factor_all          0.0786
_refine_ls_R_factor_gt           0.0566
_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^)+(0.1124P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1572
_refine_ls_wR_factor_ref         0.1772
_reflns_number_gt                1751
_reflns_number_total             2553
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            gz3170.cif
_cod_data_source_block           I
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               2017475
_cod_database_fobs_code          2017475