Functionalisation reactions of 2,5-diphenyl-1,3,4-oxadiazoles bearing a terminal ethynyl or butadiynyl substituent: X-ray crystal structures of the products.
Kreher, David; Batsanov, Andrei S.; Wang, Changsheng; Bryce, Martin R.; Organic & biomolecular chemistry 2 (2004) 858–862; doi:10.1039/b315694j

data_7150348
_publ_section_title
;
 Functionalisation reactions of 2,5-diphenyl-1,3,4-oxadiazoles bearing
 a terminal ethynyl or butadiynyl substituent: X-ray crystal structures
 of the products.
;
_journal_issue                   6
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              858
_journal_page_last               862
_journal_paper_doi               10.1039/b315694j
_journal_volume                  2
_journal_year                    2004
_chemical_formula_moiety         'C21 H18 N2 O2'
_chemical_formula_sum            'C21 H18 N2 O2'
_chemical_formula_weight         330.37
_chemical_name_systematic
; {3-[5-(4-tert-Butylphenyl)-1,3,4-oxadiazol-2-yl]-phenyl}-
propynal
;
_chemical_temperature_decomposition 426.6(15)
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 97.94(1)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.945(2)
_cell_length_b                   6.183(1)
_cell_length_c                   23.460(5)
_cell_measurement_reflns_used    915
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      20.47
_cell_measurement_theta_min      10.24
_cell_volume                     1716.0(5)
_computing_cell_refinement       'SMART version 5.625 (Bruker, 2001)'
_computing_data_collection       'SMART version 5.625 (Bruker, 2001)'
_computing_data_reduction        'SAINT version 6.02A (Bruker, 2001)'
_computing_molecular_graphics    'SHELXTL version 6.12 (Bruker, 2001)'
_computing_publication_material  'SHELXTL version 6.12 (Bruker, 2001)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      120(2)
_diffrn_detector_area_resol_mean 8
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'SMART 1K CCD area detector'
_diffrn_measurement_method       '\w 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  0.0599
_diffrn_reflns_av_sigmaI/netI    0.0375
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       30
_diffrn_reflns_limit_l_min       -30
_diffrn_reflns_number            19480
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.50
_diffrn_reflns_theta_min         1.72
_diffrn_standards_decay_%        0
_exptl_absorpt_coefficient_mu    0.083
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.279
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    .
_exptl_crystal_description       prism
_exptl_crystal_F_000             696
_exptl_crystal_size_max          0.43
_exptl_crystal_size_mid          0.17
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.313
_refine_diff_density_min         -0.349
_refine_diff_density_rms         0.054
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.051
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     298
_refine_ls_number_reflns         3935
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.051
_refine_ls_R_factor_all          0.0737
_refine_ls_R_factor_gt           0.0525
_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^)+(0.0969P)^2^+0.1289P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1459
_refine_ls_wR_factor_ref         0.1606
_reflns_number_gt                2788
_reflns_number_total             3935
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            b315694j.txt
_cod_data_source_block           (5)
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to '/home/adriana/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 1555 2011-01-17 13:19:09Z saulius 

'_chemical_melting_point' tag was changed to
'_chemical_temperature_decomposition' since the value had been given
as '152--155\% C (decomp.)'. The value was changed to '426.6(15)' - 
it was converted from degrees Celsius(C) to Kelvins(K), 
the average value was taken and precision was estimated.

Adriana Da\<skevi\<c, 2011-06-14
;
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               7150348