Elusive ethynyl azides: trapping by 1,3-dipolar cycloaddition and decomposition to cyanocarbenes
Banert, Klaus; Hagedorn, Manfred; Wutke, Jens; Ecorchard, Petra; Schaarschmidt, Dieter; Lang, Heinrich; Chemical Communications 46 (2010) 4058–; doi:10.1039/c0cc00079e

data_7111642
_publ_section_title
;
 Elusive ethynyl azides: trapping by 1,3-dipolar cycloaddition and
 decomposition to cyanocarbenes
;
_journal_issue                   23
_journal_name_full               'Chemical Communications'
_journal_page_first              4058
_journal_paper_doi               10.1039/c0cc00079e
_journal_volume                  46
_journal_year                    2010
_chemical_formula_moiety         'C16 H6 Cl4'
_chemical_formula_sum            'C16 H6 Cl4'
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_space_group_IT_number           14
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_symmetry_space_group_name_H-M   'P 1 21/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                 103.347(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.0811(2)
_cell_length_b                   13.0846(4)
_cell_length_c                   13.8754(4)
_cell_measurement_reflns_used    16791
_cell_measurement_temperature    110
_cell_measurement_theta_max      29.1783
_cell_measurement_theta_min      3.0150
_cell_volume                     1427.53(7)
_computing_cell_refinement
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.33.46 (release 27-08-2009 CrysAlis171 .NET)
(compiled Aug 27 2009,17:19:36)
;
_computing_data_collection
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.33.46 (release 27-08-2009 CrysAlis171 .NET)
(compiled Aug 27 2009,17:19:36)
;
_computing_data_reduction
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.33.46 (release 27-08-2009 CrysAlis171 .NET)
(compiled Aug 27 2009,17:19:36)
;
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      110
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Oxford Gemini S'
_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  0.0218
_diffrn_reflns_av_sigmaI/netI    0.0107
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            22130
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         26.00
_diffrn_reflns_theta_min         3.02
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 50
_diffrn_standards_interval_time  10
_diffrn_standards_number         2
_exptl_absorpt_coefficient_mu    0.813
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.88183
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.33.46 (release 27-08-2009 CrysAlis171 .NET)
(compiled Aug 27 2009,17:19:36)
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.582
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             680
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.35
_exptl_crystal_size_min          0.35
_refine_diff_density_max         0.271
_refine_diff_density_min         -0.279
_refine_diff_density_rms         0.046
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.060
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     181
_refine_ls_number_reflns         2785
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.060
_refine_ls_R_factor_all          0.0223
_refine_ls_R_factor_gt           0.0203
_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^)+(0.0346P)^2^+0.3731P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0572
_refine_ls_wR_factor_ref         0.0579
_reflns_number_gt                2579
_reflns_number_total             2785
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c0cc00079esup1.cif
_cod_data_source_block           exp_084
_cod_original_sg_symbol_H-M      'P 21/n '
_cod_database_code               7111642