Chiral gels derived from secondary ammonium salts of (1R,3S)-(+)-camphoric acid.
Adalder, Tapas Kumar; Adarsh, N. N.; Sankolli, Ravish; Dastidar, Parthasarathi; Beilstein journal of organic chemistry 6 (2010) 848–858; doi:10.3762/bjoc.6.100

data_4029778
_publ_section_title
;
 Chiral gels derived from secondary ammonium salts of
 (1R,3S)-(+)-camphoric acid.
;
_journal_name_full               'Beilstein journal of organic chemistry'
_journal_page_first              848
_journal_page_last               858
_journal_paper_doi               10.3762/bjoc.6.100
_journal_volume                  6
_journal_year                    2010
_chemical_absolute_configuration syn
_chemical_formula_sum            'C18 H33 N O4'
_chemical_formula_weight         327.45
_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                   8.6977(9)
_cell_length_b                   12.5877(13)
_cell_length_c                   18.8825(19)
_cell_measurement_temperature    298(2)
_cell_volume                     2067.3(4)
_computing_cell_refinement       'Bruker Apex II'
_computing_data_collection       'Bruker Apex II'
_computing_data_reduction        SAINT
_computing_molecular_graphics    'Mercury 2.3'
_computing_publication_material  Shelxl-97
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      298(2)
_diffrn_detector_area_resol_mean 3
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker Apex II'
_diffrn_measurement_method       'Phi-Omega scan'
_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  0.0368
_diffrn_reflns_av_sigmaI/netI    0.0374
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            8622
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         1.94
_exptl_absorpt_coefficient_mu    0.073
_exptl_absorpt_correction_T_max  0.9799
_exptl_absorpt_correction_T_min  0.9672
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.052
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             720
_exptl_crystal_size_max          0.46
_exptl_crystal_size_mid          0.38
_exptl_crystal_size_min          0.28
_refine_diff_density_max         0.365
_refine_diff_density_min         -0.265
_refine_diff_density_rms         0.084
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -1(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.090
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     204
_refine_ls_number_reflns         3609
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.090
_refine_ls_R_factor_all          0.0820
_refine_ls_R_factor_gt           0.0724
_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^)+(0.1594P)^2^+0.1144P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2043
_refine_ls_wR_factor_ref         0.2230
_reflns_number_gt                3015
_reflns_number_total             3609
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            1860-5397-6-100-S2.cif
_cod_data_source_block           0527nm
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               4029778