Are Terminal Aryl Butadiynes Stable? Synthesis and X-ray Crystal Structures of a Series of Aryl- and Heteroaryl-butadiynes (Ar-C\τbC-C\τbC-H)
Kara West; Changsheng Wang; Andrei S. Batsanov; Martin R. Bryce; Journal of Organic Chemistry 71 (2006) 8541–8544; doi:10.1021/jo0615697

data_4022059
_publ_contact_author             'Andrei S.Batsanov'
_publ_contact_author_email       a.s.batsanov@durham.ac.uk
_publ_section_title
;
 Are Terminal Aryl Butadiynes Stable? Synthesis and X-ray Crystal
 Structures of a Series of Aryl- and Heteroaryl-butadiynes
 (Ar-C\\tbC-C\\tbC-H)
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              8541
_journal_page_last               8544
_journal_paper_doi               10.1021/jo0615697
_journal_volume                  71
_journal_year                    2006
_chemical_formula_moiety         'C8 H4 N2'
_chemical_formula_sum            'C8 H4 N2'
_chemical_formula_weight         128.13
_chemical_name_systematic        ' 2-(Buta-1,3-diynyl)pyrazine  '
_space_group_IT_number           7
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P -2yac'
_symmetry_space_group_name_H-M   'P 1 n 1'
_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                 94.48(1)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   3.8182(7)
_cell_length_b                   17.949(3)
_cell_length_c                   9.4768(16)
_cell_measurement_reflns_used    2884
_cell_measurement_temperature    120(2)
_cell_measurement_theta_max      28.98
_cell_measurement_theta_min      2.44
_cell_volume                     647.5(2)
_computing_cell_refinement       'SAINT version 6.28A (Bruker, 2002)'
_computing_data_collection       'SMART version 5.625 (Bruker, 2001)'
_computing_data_reduction        'SAINT version 6.28A (Bruker, 2002)'
_computing_molecular_graphics    'SHELXTL version 6.14 (Bruker, 2003)'
_computing_publication_material  'SHELXTL version 6.14 (Bruker, 2003)'
_computing_structure_refinement  'SHELXTL version 6.14 (Bruker, 2003)'
_computing_structure_solution    'SHELXTL version 6.14 (Bruker, 2003)'
_diffrn_ambient_temperature      120(2)
_diffrn_detector_area_resol_mean 8
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'ProteumM APEX CCD area detector'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source
'60W microfocus Bede Microsource with glass polycapillary optics'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0703
_diffrn_reflns_av_sigmaI/netI    0.0455
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       24
_diffrn_reflns_limit_k_min       -24
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            7171
_diffrn_reflns_theta_full        29.00
_diffrn_reflns_theta_max         29.00
_diffrn_reflns_theta_min         2.27
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.083
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            off-white
_exptl_crystal_density_diffrn    1.314
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             264
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.340
_refine_diff_density_min         -0.447
_refine_diff_density_rms         0.069
_refine_ls_abs_structure_details
'undefinable, all \Df" set to 0, Friedel equivalents merged'
_refine_ls_extinction_coef       0.084(16)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.054
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     172
_refine_ls_number_reflns         1717
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.053
_refine_ls_R_factor_all          0.0625
_refine_ls_R_factor_gt           0.0553
_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^)+(0.1009P)^2^+0.0983P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1505
_refine_ls_wR_factor_ref         0.1566
_reflns_number_gt                1510
_reflns_number_total             1717
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            jo0615697si20060728_103547_7.cif
_cod_depositor_comments
;
The following automatic conversions were performed:
'_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_enum 1527 2010-12-29 10:47:43Z saulius 
;
_cod_original_sg_symbol_H-M      'P n'
_cod_database_code               4022059