Axially Chiral Enamides: Substituent Effects, Rotation Barriers, and Implications for their Cyclization Reactions.
Clark, Andrew J.; Curran, Dennis P.; Fox, David J.; Ghelfi, Franco; Guy, Collette S.; Hay, Benjamin; James, Natalie; Phillips, Jessica M.; Roncaglia, Fabrizio; Sellars, Philip B.; Wilson, Paul; Zhang, Hanmo; The Journal of organic chemistry 81 (2016) 5547–5565; doi:10.1021/acs.joc.6b00889

data_4036907
_publ_section_title
;
 Axially Chiral Enamides: Substituent Effects, Rotation Barriers, and
 Implications for their Cyclization Reactions.
;
_journal_issue                   13
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              5547
_journal_page_last               5565
_journal_paper_doi               10.1021/acs.joc.6b00889
_journal_volume                  81
_journal_year                    2016
_chemical_formula_moiety         'C22 H25 N O'
_chemical_formula_sum            'C22 H25 N O'
_chemical_formula_weight         319.43
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_date             2016-04-21
_audit_creation_method
;
Olex2 1.2
(compiled 2016.02.16 svn.r3265 for OlexSys, GUI svn.r5155)
;
_cell_angle_alpha                90.00
_cell_angle_beta                 112.960(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   14.9540(3)
_cell_length_b                   8.16087(11)
_cell_length_c                   15.9498(3)
_cell_measurement_reflns_used    4649
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      61.91
_cell_measurement_theta_min      3.43
_cell_volume                     1792.27(6)
_computing_cell_refinement       'CrysAlis RED, Oxford Diffraction Ltd'
_computing_data_collection       'CrysAlis CCD, Oxford Diffraction Ltd'
_computing_data_reduction        'CrysAlis RED, Oxford Diffraction Ltd'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
_computing_structure_refinement  'ShelXH-1997 (Sheldrick, 2008)'
_computing_structure_solution    'ShelXS-1997 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 10.2833
_diffrn_measured_fraction_theta_full 0.980
_diffrn_measured_fraction_theta_max 0.980
_diffrn_measurement_device_type  'Oxford Diffraction Gemini R'
_diffrn_measurement_method       '\f & \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0131
_diffrn_reflns_av_unetI/netI     0.0138
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            6068
_diffrn_reflns_theta_full        62.01
_diffrn_reflns_theta_max         62.01
_diffrn_reflns_theta_min         5.61
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    0.552
_exptl_absorpt_correction_T_max  1.00
_exptl_absorpt_correction_T_min  0.88
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'ABSPACK(CrysAlis, Oxford Diffraction)'
_exptl_crystal_colour            colourless
_exptl_crystal_colour_primary    colourless
_exptl_crystal_density_diffrn    1.184
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             688
_exptl_crystal_size_max          0.1
_exptl_crystal_size_mid          0.1
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.134
_refine_diff_density_min         -0.161
_refine_diff_density_rms         0.027
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.060
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     218
_refine_ls_number_reflns         2768
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.060
_refine_ls_R_factor_all          0.0326
_refine_ls_R_factor_gt           0.0285
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0340P)^2^+0.4406P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0722
_refine_ls_wR_factor_ref         0.0741
_reflns_number_gt                2458
_reflns_number_total             2768
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo6b00889_si_002.cif
_cod_data_source_block           cg1
_cod_original_cell_volume        1792.27(5)
_cod_database_code               4036907
_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
2.a Secondary CH2 refined with riding coordinates:
 C4(H4A,H4B), C13(H13A,H13B), C14(H14A,H14B), C15(H15A,H15B), C16(H16A,H16B),
 C17(H17A,H17B)
2.b Aromatic/amide H refined with riding coordinates:
 C6(H6), C7(H7), C8(H8), C9(H9), C10(H10), C19(H19), C20(H20), C21(H21),
 C22(H22), C23(H23)
2.c Idealised Me refined as rotating group:
 C1(H1A,H1B,H1C)
;
_olex2_submission_special_instructions 'No special instructions were received'
_shelx_res_checksum              6276