Catalytic and Stoichiometric Cumulene Formation within Dimeric Group 2 Acetylides
Arrowsmith, Merle; Crimmin, Mark R.; Hill, Michael S.; Lomas, Sarah L.; MacDougall, Dugald J.; Mahon, Mary F.; Organometallics 32 (2013) 4961–; doi:10.1021/om400678d

data_4081399
_publ_section_title
;
 Catalytic and Stoichiometric Cumulene Formation within Dimeric Group 2
 Acetylides
;
_journal_issue                   17
_journal_name_full               Organometallics
_journal_page_first              4961
_journal_paper_doi               10.1021/om400678d
_journal_volume                  32
_journal_year                    2013
_chemical_formula_sum            'C56 H46 Mg3 O2'
_chemical_formula_weight         823.86
_chemical_name_systematic
; 
 ? 
;
_space_group_crystal_system      triclinic
_space_group_IT_number           2
_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                96.909(2)
_cell_angle_beta                 98.009(2)
_cell_angle_gamma                95.833(2)
_cell_formula_units_Z            1
_cell_length_a                   9.1863(3)
_cell_length_b                   9.6764(4)
_cell_length_c                   13.1755(5)
_cell_measurement_reflns_used    11494
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      27.103
_cell_measurement_theta_min      2.910
_cell_volume                     1142.95(7)
_computing_cell_refinement       'HKL Scalepack (Otwinowski & Minor 1997)'
_computing_data_collection       'Collect (Bruker AXS BV, 1997-2004)'
_computing_data_reduction
'Denzo & Scalepack (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'ORTEX (P.McArdle, 1995)'
_computing_publication_material  'SHELXL-97/2 (Sheldrick,1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.987
_diffrn_measured_fraction_theta_max 0.987
_diffrn_measurement_device_type  '95mm CCD camera on \k-goniostat'
_diffrn_measurement_method       CCD
_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  0.1033
_diffrn_reflns_av_sigmaI/netI    0.1034
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            19956
_diffrn_reflns_theta_full        26.77
_diffrn_reflns_theta_max         26.77
_diffrn_reflns_theta_min         3.56
_exptl_absorpt_coefficient_mu    0.108
_exptl_absorpt_correction_T_max  0.998
_exptl_absorpt_correction_T_min  0.935
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
multi-scan from symmetry-related measurements 
 Sortav (Blessing 1995)
;
_exptl_crystal_colour            colourles
_exptl_crystal_density_diffrn    1.197
_exptl_crystal_description       plate
_exptl_crystal_F_000             434
_exptl_crystal_size_max          0.230
_exptl_crystal_size_mid          0.130
_exptl_crystal_size_min          0.050
_refine_diff_density_max         0.282
_refine_diff_density_min         -0.237
_refine_diff_density_rms         0.048
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.012
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     277
_refine_ls_number_reflns         4817
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.012
_refine_ls_R_factor_all          0.1359
_refine_ls_R_factor_gt           0.0583
_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^)+(0.0520P)^2^+0.3050P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1140
_refine_ls_wR_factor_ref         0.1411
_reflns_number_gt                2701
_reflns_number_total             4817
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om400678d_si_002.cif
_cod_data_source_block           k13msh23-Cpd-12
_cod_original_sg_symbol_H-M      P-1
_cod_database_code               4081399