A simple chiral recognition system to investigate substituent effects on π-π interactions.
Snyder, Seth E.; Huang, Bin-Syuan; Chen, Yu-Tzu; Lin, Huei-Shian; Carey, James R.; Organic letters 14 (2012) 3442–3445; doi:10.1021/ol3014057

data_1507869
_publ_section_title
;
 A simple chiral recognition system to investigate substituent effects on
 \p-\p interactions.
;
_journal_issue                   13
_journal_name_full               'Organic letters'
_journal_page_first              3442
_journal_page_last               3445
_journal_paper_doi               10.1021/ol3014057
_journal_volume                  14
_journal_year                    2012
_chemical_formula_moiety         'C18 H28 N2 O2'
_chemical_formula_sum            'C18 H28 N2 O2'
_chemical_formula_weight         304.42
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
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_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 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                 117.843(6)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   19.5529(9)
_cell_length_b                   10.7474(4)
_cell_length_c                   19.5495(10)
_cell_measurement_reflns_used    3680
_cell_measurement_temperature    110(2)
_cell_measurement_theta_max      28.9958
_cell_measurement_theta_min      3.0804
_cell_volume                     3632.6(3)
_computing_cell_refinement
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CrysAlis RED, Oxford Diffraction Ltd., 
Version 1.171.32.29 (release 10-06-2008 CrysAlis171 .NET) 
(compiled Jun 10 2008,16:49:55) 
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_computing_data_collection
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CrysAlis CCD, Oxford Diffraction Ltd., 
Version 1.171.32.29 (release 10-06-2008 CrysAlis171 .NET) 
(compiled Jun 10 2008,16:49:55) 
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_computing_data_reduction
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CrysAlis RED, Oxford Diffraction Ltd., 
Version 1.171.32.29 (release 10-06-2008 CrysAlis171 .NET) 
(compiled Jun 10 2008,16:49:55) 
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_computing_molecular_graphics    'Bruker SHELXTL'
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_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      110(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.860
_diffrn_measurement_device_type  'CCD detector'
_diffrn_measurement_method       'omega scan'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
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_diffrn_reflns_av_R_equivalents  0.0161
_diffrn_reflns_av_sigmaI/netI    0.0367
_diffrn_reflns_limit_h_max       25
_diffrn_reflns_limit_h_min       -25
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            8203
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         29.05
_diffrn_reflns_theta_min         3.62
_diffrn_source                   'fine-focus sealed tube'
_exptl_absorpt_coefficient_mu    0.072
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.98725
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CrysAlisPro, Oxford Diffraction Ltd., 
Version 1.171.33.46 (release 27-08-2009 CrysAlis171 .NET) 
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Empirical absorption correction using spherical harmonics, 
 implemented in SCALE3 ABSPACK scaling algorithm. 
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.113
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       parallelepiped
_exptl_crystal_F_000             1328
_exptl_crystal_size_max          0.60
_exptl_crystal_size_mid          0.45
_exptl_crystal_size_min          0.42
_refine_diff_density_max         0.349
_refine_diff_density_min         -0.310
_refine_diff_density_rms         0.039
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.030
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     219
_refine_ls_number_reflns         4184
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.030
_refine_ls_R_factor_all          0.0848
_refine_ls_R_factor_gt           0.0549
_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^)+(0.0998P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1556
_refine_ls_wR_factor_ref         0.1670
_reflns_number_gt                2696
_reflns_number_total             4184
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol3014057_si_002.cif
_cod_data_source_block           1b
_cod_depositor_comments
'Adding full bibliography for 1507868--1507878.cif.'
_cod_original_sg_symbol_H-M      'C 2/c'
_cod_database_code               1507869