Stereochemical studies of the opening of chloro vinyl epoxides: cyclic chloronium ions as intermediates.
Shemet, Andrej; Sarlah, David; Carreira, Erick M.; Organic letters 17 (2015) 1878–1881; doi:10.1021/acs.orglett.5b00558

data_1554890
_publ_section_title
;
 Stereochemical studies of the opening of chloro vinyl epoxides: cyclic
 chloronium ions as intermediates.
;
_journal_issue                   8
_journal_name_full               'Organic letters'
_journal_page_first              1878
_journal_page_last               1881
_journal_paper_doi               10.1021/acs.orglett.5b00558
_journal_volume                  17
_journal_year                    2015
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C13 H16 Br Cl2 N O3'
_chemical_formula_sum            'C13 H16 Br Cl2 N O3'
_chemical_formula_weight         385.08
_chemical_name_systematic
'(2R,4R,5R)-2,5-dichlorohexane-1,3-diyl bis((4-bromophenyl)carbamate)'
_space_group_crystal_system      monoclinic
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_audit_creation_date             2013-07-04
_audit_creation_method
;
  Olex2 1.2
  (compiled Apr  9 2013 14:10:59, GUI svn.r4458)
;
_cell_angle_alpha                90
_cell_angle_beta                 107.952(4)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   10.669(3)
_cell_length_b                   4.7706(14)
_cell_length_c                   15.964(5)
_cell_measurement_reflns_used    7344
_cell_measurement_temperature    100
_cell_measurement_theta_max      27.58
_cell_measurement_theta_min      2.68
_cell_volume                     773.0(4)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics
;
O. V. Dolomanov, L. J. Bourhis, R. J. Gildea, J. A. K. Howard and H. Puschmann,
OLEX2: a complete structure solution, refinement and analysis program.
J. Appl. Cryst. (2009). 42, 339-341.
;
_computing_publication_material
;
O. V. Dolomanov, L. J. Bourhis, R. J. Gildea, J. A. K. Howard and H. Puschmann,
OLEX2: a complete structure solution, refinement and analysis program.
J. Appl. Cryst. (2009). 42, 339-341.
;
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100.0
_diffrn_detector                 'Bruker APEX2 area detector'
_diffrn_detector_area_resol_mean 8.33
_diffrn_detector_type            'CCD area detector'
_diffrn_measured_fraction_theta_full 0.978
_diffrn_measured_fraction_theta_max 0.975
_diffrn_measurement_device       'kappa-stage diffractometer'
_diffrn_measurement_device_type  'Bruker Kappa Apex2 Duo'
_diffrn_measurement_method       '\w and \f scans'
_diffrn_radiation_monochromator  'focusing graphite'
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_radiation_xray_symbol    K-L~3~
_diffrn_reflns_av_R_equivalents  0.0315
_diffrn_reflns_av_unetI/netI     0.0482
_diffrn_reflns_Laue_measured_fraction_full 0.978
_diffrn_reflns_Laue_measured_fraction_max 0.975
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       6
_diffrn_reflns_limit_k_min       -6
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            13688
_diffrn_reflns_point_group_measured_fraction_full 0.980
_diffrn_reflns_point_group_measured_fraction_max 0.978
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.600
_diffrn_reflns_theta_min         2.007
_diffrn_source                   'sealed tube'
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    3.010
_exptl_absorpt_correction_T_max  0.7456
_exptl_absorpt_correction_T_min  0.6172
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2008/1 (Bruker,2008) was used for absorption correction.
wR2(int) was 0.0792 before and 0.0640 after correction.
The Ratio of minimum to maximum transmission is 0.8278.
The \l/2 correction factor is 0.0000.
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.655
_exptl_crystal_description       needle
_exptl_crystal_F_000             388
_exptl_crystal_size_max          0.25
_exptl_crystal_size_mid          0.035
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.293
_refine_diff_density_min         -0.260
_refine_diff_density_rms         0.054
_refine_ls_abs_structure_details
;
 Flack x determined using 1323 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons and Flack (2004), Acta Cryst. A60, s61).
;
_refine_ls_abs_structure_Flack   0.029(4)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.899
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     183
_refine_ls_number_reflns         3517
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.899
_refine_ls_R_factor_all          0.0266
_refine_ls_R_factor_gt           0.0214
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
;
 w=1/[\s^2^(Fo^2^)]
 where P=(Fo^2^+2Fc^2^)/3
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0390
_refine_ls_wR_factor_ref         0.0399
_reflns_Friedel_coverage         0.792
_reflns_Friedel_fraction_full    0.984
_reflns_Friedel_fraction_max     0.982
_reflns_number_gt                3196
_reflns_number_total             3517
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ol5b00558_si_005.cif
_cod_data_source_block           mo_ca010713_0ma
_cod_original_cell_volume        772.9(4)
_cod_database_code               1554890
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,H) groups, All N(H) groups
 At 1.5 times of:
  All C(H,H,H) groups, All O(H) groups
2.a Ternary CH refined with riding coordinates:
 C3(H3A), C5(H5), C6(H6)
2.b Secondary CH2 refined with riding coordinates:
 C4(H4A,H4B), C7(H7A,H7B)
2.c Aromatic/amide H refined with riding coordinates:
 N1(H1), C9(H9), C10(H10), C12(H12), C13(H13)
2.d Idealised Me refined as rotating group:
 C1(H1A,H1B,H1C)
2.e Idealised tetrahedral OH refined as rotating group:
 O3(H3)
;
_shelx_estimated_absorpt_t_max   0.942
_shelx_estimated_absorpt_t_min   0.520
_shelxl_version_number           2013-2