Isolable Analogues of the Breslow Intermediate Derived from Chiral Triazolylidene Carbenes
Daniel A. DiRocco; Kevin M. Oberg; Tomislav Rovis; Journal of the American Chemical Society 134 (2012) 6143–6145; doi:10.1021/ja302031v

data_4117812
_publ_section_title
;
 Isolable Analogues of the Breslow Intermediate Derived from Chiral
 Triazolylidene Carbenes
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              6143
_journal_page_last               6145
_journal_paper_doi               10.1021/ja302031v
_journal_volume                  134
_journal_year                    2012
_chemical_absolute_configuration rmad
_chemical_formula_sum            'C34 H27 Br3 N4 O'
_chemical_formula_weight         747.33
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 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                 90.677(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   9.8520(4)
_cell_length_b                   8.8052(4)
_cell_length_c                   17.8104(7)
_cell_measurement_reflns_used    9549
_cell_measurement_temperature    120
_cell_measurement_theta_max      23.98
_cell_measurement_theta_min      2.35
_cell_volume                     1544.92(11)
_computing_cell_refinement       'APEX2 (Bruker, 2009)'
_computing_data_collection       'APEX2 (Bruker, 2009)'
_computing_data_reduction        'APEX2 (Bruker, 2009)'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      120
_diffrn_measured_fraction_theta_full 0.968
_diffrn_measured_fraction_theta_max 0.968
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w 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  0.0534
_diffrn_reflns_av_sigmaI/netI    0.0924
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       24
_diffrn_reflns_limit_l_min       -24
_diffrn_reflns_number            29601
_diffrn_reflns_theta_full        29.58
_diffrn_reflns_theta_max         29.58
_diffrn_reflns_theta_min         2.07
_exptl_absorpt_coefficient_mu    3.951
_exptl_absorpt_correction_T_max  0.8091
_exptl_absorpt_correction_T_min  0.3807
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'Sheldrick, G. M. (2008) SADABS. University of G\"ottingen, Germany.'
_exptl_crystal_colour            gold
_exptl_crystal_density_diffrn    1.607
_exptl_crystal_description       plate
_exptl_crystal_F_000             744
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.06
_refine_diff_density_max         1.528
_refine_diff_density_min         -0.620
_refine_diff_density_rms         0.088
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.015(13)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.031
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     381
_refine_ls_number_reflns         8429
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.031
_refine_ls_R_factor_all          0.1373
_refine_ls_R_factor_gt           0.0618
_refine_ls_shift/su_max          0.006
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0864P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1507
_refine_ls_wR_factor_ref         0.1760
_reflns_number_gt                4498
_reflns_number_total             8429
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja302031v_si_003.cif
_cod_data_source_block           rovis140
_cod_database_code               4117812