α-Crotyl-α-difluoroboranyloxy-amides: Structure and Reactivity of Isolable Intermediates in Stereospecific α-Ketol Rearrangements.
Roßbach, Jan; Harms, Klaus; Koert, Ulrich; Organic letters 17 (2015) 3122–3125; doi:10.1021/acs.orglett.5b01427

data_1520308
_publ_section_title
;
 \a-Crotyl-\a-difluoroboranyloxy-amides: Structure and Reactivity of
 Isolable Intermediates in Stereospecific \a-Ketol Rearrangements.
;
_journal_issue                   12
_journal_name_full               'Organic letters'
_journal_page_first              3122
_journal_page_last               3125
_journal_paper_doi               10.1021/acs.orglett.5b01427
_journal_volume                  17
_journal_year                    2015
_chemical_formula_moiety         'C12 H20 B F2 N O3'
_chemical_formula_sum            'C12 H20 B F2 N O3'
_chemical_formula_weight         275.10
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2014
_cell_angle_alpha                90
_cell_angle_beta                 91.6599(14)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   7.8638(3)
_cell_length_b                   14.0418(5)
_cell_length_c                   12.6427(5)
_cell_measurement_reflns_used    9912
_cell_measurement_temperature    115(2)
_cell_measurement_theta_max      25.2972
_cell_measurement_theta_min      2.1681
_cell_volume                     1395.45(9)
_computing_cell_refinement       'SAINT V8.34A (Bruker AXS Inc., 2013)'
_computing_data_collection       'BRUKER APEX2 2014.1-1'
_computing_data_reduction        'SAINT V8.34A (Bruker AXS Inc., 2013)'
_computing_molecular_graphics    'DIAMOND (Crystal Impact)'
_computing_structure_refinement  'SHELXL-2014 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      115(2)
_diffrn_detector_area_resol_mean 10.4167
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker D8 QUEST area detector'
_diffrn_measurement_method       '\w and \f scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0288
_diffrn_reflns_av_unetI/netI     0.0140
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.998
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            23813
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.998
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         25.322
_diffrn_reflns_theta_min         2.168
_diffrn_source                   'microfocus sealed X-ray tube'
_exptl_absorpt_coefficient_mu    0.108
_exptl_absorpt_correction_T_max  0.98
_exptl_absorpt_correction_T_min  0.93
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details   'SADABS V2014/2 (Bruker AXS Inc.)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.309
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             584
_exptl_crystal_size_max          0.380
_exptl_crystal_size_mid          0.310
_exptl_crystal_size_min          0.190
_refine_diff_density_max         0.262
_refine_diff_density_min         -0.226
_refine_diff_density_rms         0.043
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.076
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     176
_refine_ls_number_reflns         2545
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.076
_refine_ls_R_factor_all          0.0353
_refine_ls_R_factor_gt           0.0316
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0369P)^2^+0.5286P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0768
_refine_ls_wR_factor_ref         0.0794
_reflns_Friedel_coverage         0.000
_reflns_number_gt                2297
_reflns_number_total             2545
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ol5b01427_si_002.cif
_cod_data_source_block           jr2050a_0m
_cod_depositor_comments
'Adding full bibliography for 1520305--1520319.cif.'
_cod_database_code               1520308
_shelx_estimated_absorpt_t_min   0.960
_shelx_estimated_absorpt_t_max   0.980
_shelxl_version_number           2014-3
_shelx_res_checksum              27720
_shelx_hkl_checksum              56384