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_2017476
_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          'C16 H16 O'
_chemical_formula_moiety         'C16 H16 O'
_chemical_formula_sum            'C16 H16 O'
_chemical_formula_weight         224.29
_chemical_name_systematic
;
1,3-diphenylbutan-1-one
;
_space_group_IT_number           29
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2ac'
_symmetry_space_group_name_H-M   'P c a 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.7926(18)
_cell_length_b                   14.931(2)
_cell_length_c                   7.8275(11)
_cell_measurement_reflns_used    1527
_cell_measurement_temperature    299(2)
_cell_measurement_theta_max      18.79
_cell_measurement_theta_min      2.42
_cell_volume                     1261.4(3)
_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 0.998
_diffrn_measured_fraction_theta_max 0.998
_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  0.0285
_diffrn_reflns_av_sigmaI/netI    0.0181
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       6
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            6471
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         3.32
_exptl_absorpt_coefficient_mu    0.072
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.181
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             480
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.106
_refine_diff_density_min         -0.112
_refine_ls_abs_structure_details
;
Absolute configuration is unknown.
An arbitrary choice of enantiomer has been made.
;
_refine_ls_abs_structure_Flack   0(10)
_refine_ls_extinction_coef       0.020(5)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL97
_refine_ls_goodness_of_fit_ref   1.052
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     155
_refine_ls_number_reflns         1201
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.051
_refine_ls_R_factor_all          0.0438
_refine_ls_R_factor_gt           0.0382
_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^)+(0.0774P)^2^+0.0454P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1088
_refine_ls_wR_factor_ref         0.1152
_reflns_number_gt                1050
_reflns_number_total             1201
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            gz3170.cif
_cod_data_source_block           II
_cod_database_code               2017476
_cod_database_fobs_code          2017476