Cationic Organomagnesium Complexes as Highly Active Initiators for the Ring-Opening Polymerization of ε-Caprolactone
Ireland, Benjamin J.; Wheaton, Craig A.; Hayes, Paul G.; Organometallics 29 (2010) 1079–; doi:10.1021/om900669y

data_4067266
_publ_section_title
;
 Cationic Organomagnesium Complexes as Highly Active Initiators for the
 Ring-Opening Polymerization of \e-Caprolactone
;
_journal_issue                   5
_journal_name_full               Organometallics
_journal_page_first              1079
_journal_paper_doi               10.1021/om900669y
_journal_volume                  29
_journal_year                    2010
_chemical_formula_sum            'C89 H93 B Mg N2 O P2'
_chemical_formula_weight         1303.71
_chemical_name_systematic
; 
 ? 
;
_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   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 99.467(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   17.563(3)
_cell_length_b                   21.636(4)
_cell_length_c                   19.826(4)
_cell_measurement_temperature    173(2)
_cell_volume                     7431(2)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_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  0.1660
_diffrn_reflns_av_sigmaI/netI    0.0930
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       21
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            59814
_diffrn_reflns_theta_full        20.82
_diffrn_reflns_theta_max         20.82
_diffrn_reflns_theta_min         1.72
_exptl_absorpt_coefficient_mu    0.115
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.9287
_exptl_absorpt_correction_type   numerical
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.165
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       Plate
_exptl_crystal_F_000             2784
_exptl_crystal_size_max          0.34
_exptl_crystal_size_mid          0.21
_exptl_crystal_size_min          0.03
_refine_diff_density_max         0.624
_refine_diff_density_min         -0.396
_refine_diff_density_rms         0.064
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.024
_refine_ls_hydrogen_treatment    calc
_refine_ls_matrix_type           full
_refine_ls_number_parameters     743
_refine_ls_number_reflns         7775
_refine_ls_number_restraints     72
_refine_ls_restrained_S_all      1.030
_refine_ls_R_factor_all          0.1585
_refine_ls_R_factor_gt           0.0844
_refine_ls_shift/su_max          0.907
_refine_ls_shift/su_mean         0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1162P)^2^+17.9565P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2080
_refine_ls_wR_factor_ref         0.2555
_reflns_number_gt                4313
_reflns_number_total             7775
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om900669y_si_001.cif
_cod_data_source_block           4b-unsqzd
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               4067266