Concerning the relative importance of enantiomorphic site versus chain end control in the stereoselective polymerization of lactides: reactions of (R,R-salen)- and (S,S-salen)-aluminum alkoxides LAlOCH2R complexes (R == CH3 and S-CHMeCl)
Malcolm Chisholm; Nathan J. Patmore; Chemical Communications  (2005) –; doi:10.1039/b413266a

data_7101113
_publ_section_title
;
Concerning the relative importance of
enantiomorphic site versus chain end control in the stereoselective
polymerization of lactides: reactions of (R,R-salen)- and
(S,S-salen)-aluminum alkoxides LAlOCH2R complexes (R == CH3 and S-CHMeCl)
;
_journal_issue                   1
_journal_name_full               'Chemical Communications'
_journal_paper_doi               10.1039/b413266a
_journal_year                    2005
_chemical_formula_sum            'C39 H58 Al Cl N2 O3'
_chemical_formula_weight         665.30
_chemical_name_systematic
;
?
;
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 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                 93.397(1)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   14.9232(10)
_cell_length_b                   11.0214(10)
_cell_length_c                   23.440(3)
_cell_measurement_temperature    293(2)
_cell_volume                     3848.6(7)
_computing_cell_refinement       'DENZO (Otwinowski & Minor, 1997)'
_computing_data_collection       'COLLECT (Nonius, 1999)'
_computing_data_reduction        'DENZO (Otwinowski & Minor, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Nonius Kappa CCD'
_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  0.073
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       25
_diffrn_reflns_limit_l_min       -25
_diffrn_reflns_number            60183
_diffrn_reflns_theta_full        22.99
_diffrn_reflns_theta_max         22.99
_diffrn_reflns_theta_min         1.58
_exptl_absorpt_coefficient_mu    0.159
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.148
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       chunk
_exptl_crystal_F_000             1440
_exptl_crystal_size_max          0.38
_exptl_crystal_size_mid          0.19
_exptl_crystal_size_min          0.15
_refine_diff_density_max         0.412
_refine_diff_density_min         -0.506
_refine_diff_density_rms         0.047
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.00(9)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.021
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     886
_refine_ls_number_reflns         10692
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.021
_refine_ls_R_factor_all          0.0749
_refine_ls_R_factor_gt           0.0508
_refine_ls_shift/su_max          1.073
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w==1/[\s^2^(Fo^2^)+(0.0819P)^2^+0.6290P] where P==(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1237
_refine_ls_wR_factor_ref         0.1364
_reflns_number_gt                8295
_reflns_number_total             10692
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b413266a.txt
_cod_depositor_comments
;
The following automatic conversions were performed:
'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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      P21
_cod_database_code               7101113