Steric Modulations in the Reversible Dimerizations of Phenalenyl Radicals via Unusually Weak Carbon-Centered π- and σ-Bonds
V. Zaitsev; S. V. Rosokha; M. Head-Gordon; J. K. Kochi; Journal of Organic Chemistry 71 (2006) 520–526; doi:10.1021/jo051612a

data_4021382
_publ_section_title
;
 Steric Modulations in the Reversible Dimerizations of Phenalenyl
 Radicals via Unusually Weak Carbon-Centered \p- and \s-Bonds
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              520
_journal_page_last               526
_journal_paper_doi               10.1021/jo051612a
_journal_volume                  71
_journal_year                    2006
_chemical_formula_sum            'C46 H54 Cl4'
_chemical_formula_weight         748.69
_chemical_name_systematic
;
  1,2-bis(3,8-di-t-butylphenalen-1-ylidene)etane
;
_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           SHELXL
_cell_angle_alpha                90.00
_cell_angle_beta                 113.023(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   11.9777(9)
_cell_length_b                   15.4966(12)
_cell_length_c                   11.5901(9)
_cell_measurement_reflns_used    1399
_cell_measurement_temperature    123(2)
_cell_measurement_theta_max      20.88
_cell_measurement_theta_min      2.27
_cell_volume                     1979.9(3)
_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  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      123(2)
_diffrn_measurement_device       'CCD area detector'
_diffrn_measurement_method       '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  0.0000
_diffrn_reflns_av_sigmaI/netI    0.1241
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       0
_diffrn_reflns_number            6380
_diffrn_reflns_theta_max         31.85
_diffrn_reflns_theta_min         1.85
_exptl_absorpt_coefficient_mu    0.331
_exptl_absorpt_correction_type   none
_exptl_crystal_density_diffrn    1.256
_exptl_crystal_F_000             796
_refine_diff_density_max         0.688
_refine_diff_density_min         -0.272
_refine_diff_density_rms         0.075
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   1.017
_refine_ls_goodness_of_fit_obs   1.183
_refine_ls_matrix_type           full
_refine_ls_number_parameters     261
_refine_ls_number_reflns         6366
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.038
_refine_ls_restrained_S_obs      1.183
_refine_ls_R_factor_all          0.2162
_refine_ls_R_factor_obs          0.0879
_refine_ls_shift/esd_max         -0.251
_refine_ls_shift/esd_mean        0.005
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.1181P)^2^+0.2153P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.2747
_refine_ls_wR_factor_obs         0.1949
_reflns_number_observed          2513
_reflns_number_total             6380
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            jo051612asi20050803_090046.cif
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.1181P)^2^+0.2153P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.1181P)^2^+0.2153P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4021382