Studies of intramolecular cyclizations of N-acyliminium ions derived from acyclic ketones: unanticipated stereochemical and structural results.
Chao, Wenchun; Waldman, Jacob H.; Weinreb, Steven M.; Organic letters 5 (2003) 2915–2918; doi:10.1021/ol035046m

data_1507353
_publ_section_title
;
 Studies of intramolecular cyclizations of N-acyliminium ions derived from
 acyclic ketones: unanticipated stereochemical and structural results.
;
_journal_issue                   16
_journal_name_full               'Organic letters'
_journal_page_first              2915
_journal_page_last               2918
_journal_paper_doi               10.1021/ol035046m
_journal_volume                  5
_journal_year                    2003
_chemical_formula_sum            'C15 H19 N O'
_chemical_formula_weight         229.31
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 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            4
_cell_length_a                   9.661(6)
_cell_length_b                   10.475(7)
_cell_length_c                   12.720(8)
_cell_measurement_temperature    98(2)
_cell_volume                     1287.3(14)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      98(2)
_diffrn_measured_fraction_theta_full 0.989
_diffrn_measured_fraction_theta_max 0.989
_diffrn_measurement_device_type  'CCD area detector'
_diffrn_measurement_method       '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  0.0318
_diffrn_reflns_av_sigmaI/netI    0.0292
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            11791
_diffrn_reflns_theta_full        28.30
_diffrn_reflns_theta_max         28.30
_diffrn_reflns_theta_min         2.52
_exptl_absorpt_coefficient_mu    0.073
_exptl_crystal_colour            Clear
_exptl_crystal_density_diffrn    1.183
_exptl_crystal_density_meas      0
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Plate
_exptl_crystal_F_000             496
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.382
_refine_diff_density_min         -0.295
_refine_diff_density_rms         0.049
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   2(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.100
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     240
_refine_ls_number_reflns         3113
_refine_ls_number_restraints     623
_refine_ls_restrained_S_all      1.050
_refine_ls_R_factor_all          0.0774
_refine_ls_R_factor_gt           0.0679
_refine_ls_shift/su_max          0.245
_refine_ls_shift/su_mean         0.030
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0948P)^2^+0.3253P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1714
_refine_ls_wR_factor_ref         0.1789
_reflns_number_gt                2710
_reflns_number_total             3113
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol035046msi20030704_101319.cif
_cod_data_source_block           jhw2s
_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_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_cell_volume        1287.3(15)
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               1507353