Chemoselective Stepwise Demetalation of Unusually Stable Fischer Biscarbene Complexes by Domino [4+2]/[2+2] Cycloaddition of 2-Isopropenyl-2-oxazoline to 1-Alkynyl Fischer Carbene Complexes of Chromium and Tungsten
Jinzhu Chen; Zhengkun Yu; Zhaoyan Zheng; Kaichun Gu; Sizhong Wu; Fanlong Zeng; Weiqiang Tan; Xiaowei Wu; Wenjing Xiao; Organometallics 24 (2005) 302–308; doi:10.1021/om049213d

data_4060056
_publ_section_title
;
 Chemoselective Stepwise Demetalation of Unusually Stable Fischer
 Biscarbene Complexes by Domino [4+2]/[2+2] Cycloaddition of
 2-Isopropenyl-2-oxazoline to 1-Alkynyl Fischer Carbene Complexes of
 Chromium and Tungsten
;
_journal_name_full               Organometallics
_journal_page_first              302
_journal_page_last               308
_journal_paper_doi               10.1021/om049213d
_journal_volume                  24
_journal_year                    2005
_chemical_formula_sum            'C20 H15 N O7 W'
_chemical_formula_weight         565.18
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                65.069(2)
_cell_angle_beta                 82.996(2)
_cell_angle_gamma                79.906(2)
_cell_formula_units_Z            2
_cell_length_a                   7.4353(7)
_cell_length_b                   12.1255(11)
_cell_length_c                   12.5732(12)
_cell_measurement_reflns_used    3202
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      52.692
_cell_measurement_theta_min      5.573
_cell_volume                     1010.55(16)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_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      293(2)
_diffrn_measured_fraction_theta_full 0.972
_diffrn_measured_fraction_theta_max 0.972
_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  0.1375
_diffrn_reflns_av_sigmaI/netI    0.0979
_diffrn_reflns_limit_h_max       9
_diffrn_reflns_limit_h_min       -9
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            5994
_diffrn_reflns_theta_full        27.00
_diffrn_reflns_theta_max         27.00
_diffrn_reflns_theta_min         1.79
_exptl_absorpt_coefficient_mu    5.757
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.47279
_exptl_absorpt_correction_type   empirical
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.857
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             544
_exptl_crystal_size_max          0.425
_exptl_crystal_size_mid          0.196
_exptl_crystal_size_min          0.091
_refine_diff_density_max         4.217
_refine_diff_density_min         -3.525
_refine_diff_density_rms         0.317
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.037
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     263
_refine_ls_number_reflns         4294
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.037
_refine_ls_R_factor_all          0.0757
_refine_ls_R_factor_gt           0.0719
_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^)+(0.1203P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1744
_refine_ls_wR_factor_ref         0.1776
_reflns_number_gt                3779
_reflns_number_total             4294
_reflns_threshold_expression     >2sigma(I)
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Triclinic' changed to 'triclinic'
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-1
_cod_database_code               4060056