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_1554902
_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         'C6 H12 Cl2 O2'
_chemical_formula_sum            'C6 H12 Cl2 O2'
_chemical_formula_weight         187.06
_chemical_name_systematic        (3S,4R)-2,4-dichlorohexane-1,3-diol
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_atom_sites_solution_hydrogens   geom
_audit_creation_date             2013-09-20
_audit_creation_method
;
Olex2 1.2
(compiled 2013.09.17 svn.r2790 for OlexSys, GUI svn.r4601)
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   5.8932(6)
_cell_length_b                   9.8358(10)
_cell_length_c                   14.7998(15)
_cell_measurement_reflns_used    9984
_cell_measurement_temperature    100
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      2.75
_cell_volume                     857.86(15)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    OLEX2
_computing_publication_material  OLEX2
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      99.98
_diffrn_detector                 'Bruker APEX2 area detector'
_diffrn_detector_area_resol_mean 8.33
_diffrn_detector_type            'CCD area detector'
_diffrn_measured_fraction_theta_full 0.983
_diffrn_measured_fraction_theta_max 0.984
_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  0.0202
_diffrn_reflns_av_unetI/netI     0.0136
_diffrn_reflns_Laue_measured_fraction_full 0.983
_diffrn_reflns_Laue_measured_fraction_max 0.984
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -3
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            13679
_diffrn_reflns_point_group_measured_fraction_full 0.988
_diffrn_reflns_point_group_measured_fraction_max 0.987
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.518
_diffrn_reflns_theta_min         2.486
_diffrn_source                   'sealed tube'
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.698
_exptl_absorpt_correction_T_max  0.7456
_exptl_absorpt_correction_T_min  0.6668
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
SADABS-2008/1 (Bruker,2008) was used for absorption correction.
wR2(int) was 0.0386 before and 0.0305 after correction.
The Ratio of minimum to maximum transmission is 0.8943.
The \l/2 correction factor is 0.0000.
;
_exptl_crystal_colour            colourless
_exptl_crystal_colour_lustre     clear
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.448
_exptl_crystal_description       needle
_exptl_crystal_F_000             392
_exptl_crystal_size_max          0.34
_exptl_crystal_size_mid          0.13
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.307
_refine_diff_density_min         -0.180
_refine_diff_density_rms         0.036
_refine_ls_abs_structure_details
;
 Flack x determined using 777 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons and Flack (2004), Acta Cryst. A60, s61).
;
_refine_ls_abs_structure_Flack   0.014(15)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.100
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     94
_refine_ls_number_reflns         1952
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.100
_refine_ls_R_factor_all          0.0179
_refine_ls_R_factor_gt           0.0172
_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^)+(0.0251P)^2^+0.1104P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0441
_refine_ls_wR_factor_ref         0.0445
_reflns_Friedel_coverage         0.696
_reflns_Friedel_fraction_full    0.995
_reflns_Friedel_fraction_max     0.993
_reflns_number_gt                1907
_reflns_number_total             1952
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ol5b00558_si_010.cif
_cod_data_source_block           mo_ca190913_0m
_cod_database_code               1554902
_shelxl_version_number           2013-3
_shelx_estimated_absorpt_t_max   0.973
_shelx_estimated_absorpt_t_min   0.797
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups, All C(H,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(H3), C4(H4), C5(H5)
2.b Secondary CH2 refined with riding coordinates:
 C2(H2A,H2B), C6(H6A,H6B)
2.c Idealised Me refined as rotating group:
 C1(H1A,H1B,H1C)
2.d Idealised tetrahedral OH refined as rotating group:
 O1(H1), O2(H2)
;