Nonbonded, Attractive Cation-π Interactions in Azide-Mediated Asymmetric Ring Expansion Reactions
Christopher E. Katz; Timothy Ribelin; Donna Withrow; Yashar Basseri; Anna K. Manukyan; Amy Bermudez; Christian G Nuera; Victor W. Day; Douglas R. Powell; Jennifer L. Poutsma; Jeffrey Aubé; Journal of Organic Chemistry 73 (2008) 3318–3327; doi:10.1021/jo800222r

data_4023391
_publ_contact_author
; 
   Prof. Jeffrey Aub\'e 
   Department of Medicinal Chemistry -- University of Kansas 
   Malott Hall 
   1251 Wescoe Hall Dr, Rm 4070 
   Lawrence, KS  66045-7582  USA 
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_publ_contact_author_email       jaube@ku.edu
_publ_contact_author_fax         1(785)8645326
_publ_contact_author_phone       1(785)8644496
_publ_section_title
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 Nonbonded, Attractive Cation-\p Interactions in
 Azide-Mediated Asymmetric Ring Expansion Reactions
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_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              3318
_journal_page_last               3327
_journal_paper_doi               10.1021/jo800222r
_journal_volume                  73
_journal_year                    2008
_chemical_formula_sum            'C18 H26 N2 O4'
_chemical_formula_weight         334.41
_space_group_IT_number           29
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2ac'
_symmetry_space_group_name_H-M   'P c a 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   22.6425(13)
_cell_length_b                   6.5325(4)
_cell_length_c                   23.7395(13)
_cell_measurement_reflns_used    4135
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      22.47
_cell_measurement_theta_min      2.49
_cell_volume                     3511.4(4)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'Bruker SHELXTL'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker SMART APEX CCD area detector'
_diffrn_measurement_method       'phi and omega 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  0.0690
_diffrn_reflns_av_sigmaI/netI    0.0667
_diffrn_reflns_limit_h_max       30
_diffrn_reflns_limit_h_min       -31
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       33
_diffrn_reflns_limit_l_min       -33
_diffrn_reflns_number            39645
_diffrn_reflns_theta_full        30.02
_diffrn_reflns_theta_max         30.02
_diffrn_reflns_theta_min         1.80
_diffrn_standards_decay_%        0.00
_exptl_absorpt_coefficient_mu    0.089
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.931
_exptl_absorpt_correction_type   multi-scan
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.265
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Rectangular
_exptl_crystal_F_000             1440
_exptl_crystal_size_max          0.46
_exptl_crystal_size_mid          0.14
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.552
_refine_diff_density_min         -0.232
_refine_diff_density_rms         0.074
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.3(11)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.999
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     447
_refine_ls_number_reflns         10196
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.999
_refine_ls_R_factor_all          0.0940
_refine_ls_R_factor_gt           0.0645
_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^)+(0.0901P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1437
_refine_ls_wR_factor_ref         0.1575
_reflns_number_gt                7451
_reflns_number_total             10196
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo800222r-File003_3.cif
_cod_data_source_block           k93a_(Compound_28b)
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Orthorhombic' changed to 'orthorhombic'
according to '/home/saulius/struct/CIF-dictionaries/cif_core.dic'
dictionary named 'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_enum 1527 2010-12-29 10:47:43Z saulius 
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_cod_database_code               4023391