Bonded peri-interactions govern the rate of racemisation of atropisomeric 8-substituted 1-naphthamides†
Clayden, Jonathan; McCarthy, Catherine; Helliwell, Madeleine; Chemical Communications  (1999) 2059–; doi:10.1039/a906398f

data_7110681
_publ_section_title
;
 Bonded peri-interactions govern the rate of racemisation of atropisomeric
 8-substituted 1-naphthamides&#x2020;
;
_journal_issue                   20
_journal_name_full               'Chemical Communications'
_journal_page_first              2059
_journal_paper_doi               10.1039/a906398f
_journal_year                    1999
_chemical_formula_sum            'C20 H28 N2 O'
_chemical_formula_weight         312.45
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_Int_Tables_number      2
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_audit_creation_date             1998-05-20
_audit_creation_method           'by teXsan v1.7'
_audit_update_record             ?
_cell_angle_alpha                96.95(1)
_cell_angle_beta                 101.14(2)
_cell_angle_gamma                73.22(1)
_cell_formula_units_Z            4
_cell_length_a                   11.245(2)
_cell_length_b                   16.635(2)
_cell_length_c                   10.714(2)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    296.2
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      15.0
_cell_volume                     1878.1(6)
_computing_cell_refinement       'MSC/AFC Diffractometer Control'
_computing_data_collection       'MSC/AFC Diffractometer Control'
_computing_data_reduction        'teXsan (MSC, 1995)'
_computing_publication_material  'teXsan (MSC, 1995)'
_computing_structure_refinement  'teXsan (MSC, 1995)'
_diffrn_ambient_temperature      296.2
_diffrn_measurement_device       'Rigaku AFC5R'
_diffrn_measurement_method       \w-2\q
_diffrn_orient_matrix_UB_11      0.06456
_diffrn_orient_matrix_UB_12      -0.05420
_diffrn_orient_matrix_UB_13      -0.01550
_diffrn_orient_matrix_UB_21      -0.04071
_diffrn_orient_matrix_UB_22      -0.02950
_diffrn_orient_matrix_UB_23      0.04824
_diffrn_orient_matrix_UB_31      -0.05521
_diffrn_orient_matrix_UB_32      -0.01238
_diffrn_orient_matrix_UB_33      -0.08078
_diffrn_radiation_detector       'scintillation counter'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Rigaku rotating anode'
_diffrn_radiation_type           'Cu K\a'
_diffrn_radiation_wavelength     1.5418
_diffrn_reflns_av_R_equivalents  0.03849
_diffrn_reflns_av_sigmaI/netI    0.110
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -20
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            8399
_diffrn_reflns_reduction_process 'Lp corrections applied'
_diffrn_reflns_theta_max         79.86
_diffrn_reflns_theta_min         2.78
_diffrn_standards_decay_%        0.44
_diffrn_standards_interval_count 150
_diffrn_standards_number         3
_exptl_absorpt_coefficient_mu    0.495
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.896
_exptl_absorpt_correction_type
;
\y scans (North,Phillips & Matthews, 1968)
;
_exptl_crystal_colour            colourlessneedle
_exptl_crystal_density_diffrn    1.105
_exptl_crystal_density_meas      ?
_exptl_crystal_description       needle
_exptl_crystal_F_000             680.00
_exptl_crystal_size_max          0.50
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.34
_refine_diff_density_min         -0.23
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   2.158
_refine_ls_goodness_of_fit_obs   2.943
_refine_ls_hydrogen_treatment    noref
_refine_ls_matrix_type           full
_refine_ls_number_constraints    0
_refine_ls_number_parameters     415
_refine_ls_number_reflns         3757
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.1707
_refine_ls_R_factor_obs          0.0744
_refine_ls_shift/esd_max         0.0010
_refine_ls_shift/esd_mean        0.0150
_refine_ls_structure_factor_coef F
_refine_ls_weighting_details     'w = 1/[\s^2^(Fo) + 0.00002|Fo|^2^]'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0595
_refine_ls_wR_factor_obs         0.0551
_reflns_number_observed          3757
_reflns_number_total             7668
_reflns_observed_criterion       >2.00\s(I)
_cod_data_source_file            906398fsup1.cif
_cod_data_source_block           1
_cod_depositor_comments
;
 Renaming the _geom_torsion_site_symmetry_4 data item to _geom_torsion.
 The initial data name misassignment was cause by the incorrect data name
 order in the loop and the removal of data items containing only unknown
 ('?') or inapplicable ('.') values.

 Antanas Vaitkus,
 2018-08-08

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' 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 'w = 1/[\s^2^(Fo) +
0.00002|Fo|^2^]' 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) + 0.00002|Fo|^2^]'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        1878.0(6)
_cod_original_sg_symbol_H-M      'P -1       '
_cod_original_formula_sum        'C20 H28 N2 O '
_cod_database_code               7110681