Heterocyclization of Enediynes Promoted by Sodium Azide: A Case of Ambiguity of X-ray Data and Structure Revision.
Gulevskaya, Anna V.; Tyaglivy, Alexander S.; Pozharskii, Alexander F.; Nelina-Nemtseva, Julia I; Steglenko, Dmitry V.; Organic letters 16 (2014) 1582–1585; doi:10.1021/ol500125j

data_1513943
_publ_section_title
;
 Heterocyclization of Enediynes Promoted by Sodium Azide: A Case of
 Ambiguity of X-ray Data and Structure Revision.
;
_journal_issue                   6
_journal_name_full               'Organic letters'
_journal_page_first              1582
_journal_page_last               1585
_journal_paper_doi               10.1021/ol500125j
_journal_volume                  16
_journal_year                    2014
_chemical_formula_moiety         'C20 H17 N3'
_chemical_formula_sum            'C20 H17 N3'
_chemical_formula_weight         299.37
_chemical_name_systematic
; 
 ? 
;
_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-97
_cell_angle_alpha                90.00
_cell_angle_beta                 108.566(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   13.0279(10)
_cell_length_b                   11.2610(9)
_cell_length_c                   11.0155(9)
_cell_measurement_reflns_used    385
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      29
_cell_measurement_theta_min      3
_cell_volume                     1531.9(2)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX II'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker APEX II 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  0.0312
_diffrn_reflns_av_sigmaI/netI    0.0248
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            17865
_diffrn_reflns_theta_full        29.00
_diffrn_reflns_theta_max         29.00
_diffrn_reflns_theta_min         1.65
_exptl_absorpt_coefficient_mu    0.078
_exptl_absorpt_correction_T_max  0.985
_exptl_absorpt_correction_T_min  0.966
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            pale-yellow
_exptl_crystal_density_diffrn    1.298
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             632
_exptl_crystal_size_max          0.45
_exptl_crystal_size_mid          0.33
_exptl_crystal_size_min          0.20
_refine_diff_density_max         0.231
_refine_diff_density_min         -0.244
_refine_diff_density_rms         0.041
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.006
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     208
_refine_ls_number_reflns         4082
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.006
_refine_ls_R_factor_all          0.0604
_refine_ls_R_factor_gt           0.0412
_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^)+(0.0242P)^2^+0.7567P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0848
_refine_ls_wR_factor_ref         0.0952
_reflns_number_gt                3075
_reflns_number_total             4082
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ol500125j_si_005.cif
_cod_data_source_block           p21c
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/usr/data/users/saulius/crontab/automatic-downloads/current/ACS/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_sg_symbol_H-M      'P 21/c'
_cod_database_code               1513943