Stereoselective Production of Poly(rac-lactide) by ROP with Highly Efficient Bulky Heteroscorpionate Alkylmagnesium Initiators
Sánchez-Barba, Luis F.; Garcés, Andrés; Fernández-Baeza, Juan; Otero, Antonio; Alonso-Moreno, Carlos; Lara-Sánchez, Agustín; Rodríguez, Ana M.; Organometallics 30 (2011) 2775–; doi:10.1021/om200163t

data_4064535
_publ_section_title
;
 Stereoselective Production of Poly(rac-lactide) by ROP with Highly
 Efficient Bulky Heteroscorpionate Alkylmagnesium Initiators
;
_journal_issue                   10
_journal_name_full               Organometallics
_journal_page_first              2775
_journal_paper_doi               10.1021/om200163t
_journal_volume                  30
_journal_year                    2011
_chemical_formula_moiety         'C31 H56 Mg N6, C4 H10 O'
_chemical_formula_sum            'C35 H66 Mg N6 O'
_chemical_formula_weight         611.25
_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                 93.321(6)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   10.2612(9)
_cell_length_b                   17.109(2)
_cell_length_c                   23.306(2)
_cell_measurement_temperature    200(2)
_cell_volume                     4084.7(7)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX'
_computing_data_reduction        'Bruker SAINT, SADABS, XPREP'
_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      200(2)
_diffrn_measured_fraction_theta_full 0.971
_diffrn_measured_fraction_theta_max 0.971
_diffrn_measurement_device_type  'CCd area detector'
_diffrn_measurement_method       '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  0.0902
_diffrn_reflns_av_sigmaI/netI    0.1480
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -19
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            20440
_diffrn_reflns_theta_full        25.01
_diffrn_reflns_theta_max         25.01
_diffrn_reflns_theta_min         1.75
_exptl_absorpt_coefficient_mu    0.074
_exptl_absorpt_correction_T_max  0.9933
_exptl_absorpt_correction_T_min  0.9838
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    0.994
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             1352
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.12
_exptl_crystal_size_min          0.09
_refine_diff_density_max         0.600
_refine_diff_density_min         -0.278
_refine_diff_density_rms         0.101
_refine_ls_extinction_coef       0.015(2)
_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   0.947
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     408
_refine_ls_number_reflns         5898
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.947
_refine_ls_R_factor_all          0.1219
_refine_ls_R_factor_gt           0.0798
_refine_ls_shift/su_max          0.057
_refine_ls_shift/su_mean         0.004
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1458P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1262
_refine_ls_wR_factor_ref         0.1892
_reflns_number_gt                3646
_reflns_number_total             6993
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om200163t_si_002.cif
_cod_data_source_block           6a
_cod_original_sg_symbol_H-M      P21/c
_cod_database_code               4064535