Synthesis of oxacalixarenes incorporating nitrogen heterocycles: evidence for thermodynamic control.
Katz, Jeffrey L.; Geller, Bram J.; Conry, Rebecca R.; Organic letters 8 (2006) 2755–2758; doi:10.1021/ol060823e

data_1506014
_publ_section_title
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 Synthesis of oxacalixarenes incorporating nitrogen heterocycles: evidence
 for thermodynamic control.
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_journal_issue                   13
_journal_name_full               'Organic letters'
_journal_page_first              2755
_journal_page_last               2758
_journal_paper_doi               10.1021/ol060823e
_journal_volume                  8
_journal_year                    2006
_chemical_formula_moiety         'C22 H16 N4 O4'
_chemical_formula_sum            'C22 H16 N4 O4'
_chemical_formula_weight         400.39
_chemical_melting_point_gt       533
_chemical_name_common            'compound 11e'
_chemical_name_systematic
;
     5,17,25,27-tetraaza-11,23-dimethyl-2,8,14,20-tetraoxacalix[4]arene
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_atom_sites_solution_hydrogens   geom
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_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.8420(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   15.6963(10)
_cell_length_b                   10.9386(7)
_cell_length_c                   22.5637(14)
_cell_measurement_reflns_used    7455
_cell_measurement_temperature    171(2)
_cell_measurement_theta_max      28.25
_cell_measurement_theta_min      2.27
_cell_volume                     3873.7(4)
_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      171(2)
_diffrn_measured_fraction_theta_full 0.965
_diffrn_measured_fraction_theta_max 0.965
_diffrn_measurement_device_type  '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  0.0989
_diffrn_reflns_av_sigmaI/netI    0.0666
_diffrn_reflns_limit_h_max       20
_diffrn_reflns_limit_h_min       -20
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_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       29
_diffrn_reflns_limit_l_min       -29
_diffrn_reflns_number            17002
_diffrn_reflns_theta_full        28.28
_diffrn_reflns_theta_max         28.28
_diffrn_reflns_theta_min         1.81
_exptl_absorpt_coefficient_mu    0.097
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.373
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             1664
_exptl_crystal_size_max          0.48
_exptl_crystal_size_mid          0.35
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.266
_refine_diff_density_min         -0.246
_refine_diff_density_rms         0.045
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.053
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     273
_refine_ls_number_reflns         4643
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.053
_refine_ls_R_factor_all          0.0555
_refine_ls_R_factor_gt           0.0461
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0681P)^2^+0.7695P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1307
_refine_ls_wR_factor_ref         0.1373
_reflns_number_gt                3714
_reflns_number_total             4643
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol060823esi20060405_025711.cif
_cod_data_source_block           katz56m
_cod_depositor_comments
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The following automatic conversions were performed:

'_chemical_melting_point' tag was changed to
'_chemical_melting_point_gt' since the value was specified 'more
than' ('>') a certain temperature. The value '>533K' was changed to
'533' - it should be numeric and without a unit
designator.

'_symmetry_cell_setting' value 'Monoclinic' changed to
'monoclinic' 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 

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not_measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
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_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               1506014