Cooperative benzylic–oxyallylic stabilized cations: regioselective construction of α-quaternary centers in ketone-derived compounds
Dange, Nitin S.; Stepherson, Jacob R.; Ayala, Caitlan E.; Fronczek, Frank R.; Kartika, Rendy; Chem. Sci. 6 (2015) 6312–; doi:10.1039/C5SC01914A

data_1529261
_publ_section_title
;
 Cooperative benzylic--oxyallylic stabilized cations: regioselective
 construction of \a-quaternary centers in ketone-derived compounds
;
_journal_issue                   11
_journal_name_full               'Chem. Sci.'
_journal_page_first              6312
_journal_paper_doi               10.1039/C5SC01914A
_journal_volume                  6
_journal_year                    2015
_chemical_formula_moiety         'C20 H19 N O'
_chemical_formula_sum            'C20 H19 N O'
_chemical_formula_weight         306.60
_space_group_IT_number           148
_symmetry_cell_setting           trigonal
_symmetry_space_group_name_Hall  '-R 3'
_symmetry_space_group_name_H-M   'R -3 :H'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_audit_update_record
;
2015-04-01 deposited with the CCDC.
2015-07-22 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                120
_cell_formula_units_Z            18
_cell_length_a                   25.0795(18)
_cell_length_b                   25.0795(18)
_cell_length_c                   13.9752(13)
_cell_measurement_reflns_used    3430
_cell_measurement_temperature    135.0(5)
_cell_measurement_theta_max      26.39
_cell_measurement_theta_min      2.37
_cell_volume                     7612.5(10)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'ORTEP-3 for Windows (Farrugia, 2012)'
_computing_publication_material  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      135.0(5)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.983
_diffrn_measurement_device_type  'Bruker Kappa APEX-II DUO'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  'TRIUMPH curved graphite'
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0325
_diffrn_reflns_av_sigmaI/netI    0.0379
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -31
_diffrn_reflns_limit_k_max       31
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            12232
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         27.09
_diffrn_reflns_theta_min         1.62
_exptl_absorpt_coefficient_mu    0.073
_exptl_absorpt_correction_T_max  0.9934
_exptl_absorpt_correction_T_min  0.8793
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2004)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.204
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       fragment
_exptl_crystal_F_000             2952
_exptl_crystal_recrystallization_method
'Re-crystallisation from solvent: hexane/dichloromethane'
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.21
_exptl_crystal_size_min          0.09
_platon_squeeze_details
;
The 179 electrons removed by SQUEEZE correspond to 3.6 molecules
of disordered hexane per unit cell or 0.2 per main molecule. This
solvent is included in the density, FW, etc., but is not in the model.
;
_refine_diff_density_max         0.343
_refine_diff_density_min         -0.323
_refine_diff_density_rms         0.041
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.071
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     203
_refine_ls_number_reflns         3678
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.071
_refine_ls_R_factor_all          0.0699
_refine_ls_R_factor_gt           0.0483
_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^)+(0.0571P)^2^+4.8033P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1181
_refine_ls_wR_factor_ref         0.1262
_reflns_number_gt                2685
_reflns_number_total             3678
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            c5sc01914a2.cif
_cod_data_source_block           NDange3
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Trigonal' changed to 'trigonal'
according to
/usr/data/users/saulius/crontab/automatic-downloads/rss-feeds/RSC/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 3271 2015-04-21 07:52:19Z andrius 

 Adding full bibliography for 1529260--1529265.cif.
;
_cod_original_sg_symbol_Hall     '-R 3 '
_cod_original_sg_symbol_H-M      'R -3   '
_cod_database_code               1529261