A Colorimetric Proton Sponge
Charles D. Swor; Lev N. Zakharov; David R. Tyler; Journal of Organic Chemistry 75 (2010) 6977–6979; doi:10.1021/jo101381r

data_4025726
_publ_section_title
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 A Colorimetric Proton Sponge
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_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              6977
_journal_page_last               6979
_journal_paper_doi               10.1021/jo101381r
_journal_volume                  75
_journal_year                    2010
_chemical_formula_sum            'C18 H18 N2 O3'
_chemical_formula_weight         310.34
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXLTL
_cell_angle_alpha                90.00
_cell_angle_beta                 96.697(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.0429(6)
_cell_length_b                   17.4903(16)
_cell_length_c                   12.7831(11)
_cell_measurement_reflns_used    3216
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      21.96
_cell_measurement_theta_min      2.33
_cell_volume                     1563.9(2)
_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      173(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'CCD area detector Bruker Apex'
_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  0.0362
_diffrn_reflns_av_sigmaI/netI    0.0501
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       22
_diffrn_reflns_limit_k_min       -22
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            17571
_diffrn_reflns_theta_full        27.00
_diffrn_reflns_theta_max         27.00
_diffrn_reflns_theta_min         1.60
_exptl_absorpt_coefficient_mu    0.091
_exptl_absorpt_correction_T_max  0.9982
_exptl_absorpt_correction_T_min  0.9750
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            dark-blue
_exptl_crystal_density_diffrn    1.318
_exptl_crystal_density_meas      0
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             656
_exptl_crystal_size_max          0.28
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.156
_refine_diff_density_min         -0.145
_refine_diff_density_rms         0.034
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.5(9)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.059
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     559
_refine_ls_number_reflns         6786
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.059
_refine_ls_R_factor_all          0.0608
_refine_ls_R_factor_gt           0.0446
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0294P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0747
_refine_ls_wR_factor_ref         0.0811
_reflns_number_gt                5506
_reflns_number_total             6786
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo101381r_si_002.cif
_cod_data_source_block           char8
_cod_depositor_comments
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The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to the built-in table from CIF Core dictionary named
'cif_core.dic' version 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1646 2011-03-28 12:23:43Z adriana 
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_cod_database_code               4025726