Cerberus-type N-heterocyclic carbenes: synthesis and study of the first tritopic carbenes with D(3h)-symmetry.
Williams, Kyle A.; Bielawski, Christopher W.; Chemical communications (Cambridge, England) 46 (2010) 5166–5168; doi:10.1039/c0cc01070g

data_7113051
_publ_section_title
;
 Cerberus-type N-heterocyclic carbenes: synthesis and study of the first
 tritopic carbenes with D(3h)-symmetry.
;
_journal_issue                   28
_journal_name_full
'Chemical communications (Cambridge, England)'
_journal_page_first              5166
_journal_page_last               5168
_journal_paper_doi               10.1039/c0cc01070g
_journal_volume                  46
_journal_year                    2010
_chemical_formula_moiety         9,10-(C6H13)2-C20H12
_chemical_formula_sum            'C32 H38'
_chemical_formula_weight         422.62
_chemical_name_common            9,10-dihexyl-triptycene
_chemical_name_systematic
;
?
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 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                 117.24(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            28
_cell_length_a                   69.417(14)
_cell_length_b                   8.3391(17)
_cell_length_c                   33.478(7)
_cell_measurement_temperature    150(2)
_cell_volume                     17230(8)
_computing_cell_refinement       'Collect software, Nonius B.V. 1998'
_computing_data_collection       'Collect software, Nonius B.V. 1998'
_computing_data_reduction
'DENZO and Scalepack (Otwinoski and Minor, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       'phi 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  0.0566
_diffrn_reflns_av_sigmaI/netI    0.0689
_diffrn_reflns_limit_h_max       82
_diffrn_reflns_limit_h_min       -81
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       39
_diffrn_reflns_limit_l_min       -39
_diffrn_reflns_number            29014
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.91
_exptl_absorpt_coefficient_mu    0.064
_exptl_absorpt_correction_type   none
_exptl_absorpt_process_details   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.140
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             6440
_exptl_crystal_size_max          0.53
_exptl_crystal_size_mid          0.32
_exptl_crystal_size_min          0.28
_refine_diff_density_max         1.208
_refine_diff_density_min         -0.990
_refine_diff_density_rms         0.050
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.994
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     1036
_refine_ls_number_reflns         15111
_refine_ls_number_restraints     62
_refine_ls_restrained_S_all      1.004
_refine_ls_R_factor_all          0.1245
_refine_ls_R_factor_gt           0.0753
_refine_ls_shift/su_max          0.038
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0555P)^2^+57.1491P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1613
_refine_ls_wR_factor_ref         0.1857
_reflns_number_gt                9689
_reflns_number_total             15111
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c0cc01070g.txt
_cod_data_source_block           9,10-dihexyltriptycene
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/usr/data/users/saulius/automatic-downloads/retrospective/RSC/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 
;
_cod_original_cell_volume        17231(6)
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               7113051