Synthesis of an Extremely Crowded Naphthalene via a Stable Norbornadienone
Jiajia Zhang; Douglas M. Ho; Robert A. Pascal; Journal of the American Chemical Society 123 (2001) 10919–10926; doi:10.1021/ja011453m

data_5000397
_publ_section_title
;
Synthesis of an Extremely Crowded Naphthalene via a Stable Norbornadienone
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              10919
_journal_page_last               10926
_journal_paper_doi               10.1021/ja011453m
_journal_volume                  123
_journal_year                    2001
_chemical_compound_source        'chemical synthesis'
_chemical_formula_moiety         'C42 H38'
_chemical_formula_structural     'C42 H38 . C H2 Cl2'
_chemical_formula_sum            'C43 H40 Cl2'
_chemical_formula_weight         627.65
_chemical_name_systematic
; 
 4,6-Di(t-butyl)-1,2,3-triphenylfluoranthene 
;
_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
_cell_angle_alpha                90.00
_cell_angle_beta                 102.452(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   13.3467(9)
_cell_length_b                   9.3553(5)
_cell_length_c                   27.408(2)
_cell_measurement_reflns_used    20880
_cell_measurement_temperature    200(2)
_cell_measurement_theta_max      22.44
_cell_measurement_theta_min      1.52
_cell_volume                     3341.7(4)
_computing_cell_refinement       DENZO-SMN
_computing_data_collection       'Nonius COLLECT'
_computing_data_reduction        DENZO-SMN
_computing_molecular_graphics    'Siemens SHELXTL'
_computing_publication_material  'Siemens SHELXTL'
_computing_structure_refinement  'Siemens SHELXTL'
_computing_structure_solution    'Siemens SHELXTL'
_diffrn_ambient_temperature      200(2)
_diffrn_measurement_device       'Nonius KappaCCD'
_diffrn_measurement_method
'omega scans; 860 0.5-degree frames; 240 sec/deg'
_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  0.074
_diffrn_reflns_av_sigmaI/netI    0.0703
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -29
_diffrn_reflns_number            20880
_diffrn_reflns_theta_max         22.44
_diffrn_reflns_theta_min         1.52
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.22
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            'Pale yellow'
_exptl_crystal_density_diffrn    1.248
_exptl_crystal_density_meas      ?
_exptl_crystal_description       Needle
_exptl_crystal_F_000             1328
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.234
_refine_diff_density_min         -0.173
_refine_diff_density_rms         0.043
_refine_ls_extinction_coef       none
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   0.969
_refine_ls_goodness_of_fit_obs   1.144
_refine_ls_hydrogen_treatment    'XYZ riding, U(H) = 1.2U(C) or 1.5U(Cmethyl)'
_refine_ls_matrix_type           full
_refine_ls_number_parameters     385
_refine_ls_number_reflns         4325
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.969
_refine_ls_restrained_S_obs      1.144
_refine_ls_R_factor_all          0.1065
_refine_ls_R_factor_obs          0.0575
_refine_ls_shift/esd_max         0.000
_refine_ls_shift/esd_mean        0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0903P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1543
_refine_ls_wR_factor_obs         0.1372
_reflns_number_observed          2594
_reflns_number_total             4325
_reflns_observed_criterion       >2sigma(I)
_cod_depositor_comments
;
The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'none' was changed to '?' - the
value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0903P)^2^+0.0000P] 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^)+(0.0903P)^2^+0.0000P] 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/n'
_cod_database_code               5000397