Asymmetric glycolate aldol reactions using cinchonium phase-transfer catalysts.
Andrus, Merritt B.; Liu, Jing; Ye, Zhifeng; Cannon, John F.; Organic letters 7 (2005) 3861–3864; doi:10.1021/ol051096a

data_1506625
_publ_section_title
;
 Asymmetric glycolate aldol reactions using cinchonium phase-transfer
 catalysts.
;
_journal_issue                   18
_journal_name_full               'Organic letters'
_journal_page_first              3861
_journal_page_last               3864
_journal_paper_doi               10.1021/ol051096a
_journal_volume                  7
_journal_year                    2005
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C32 H30 O6'
_chemical_formula_sum            'C32 H30 O6'
_chemical_formula_weight         510.56
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.8004(3)
_cell_length_b                   12.0028(4)
_cell_length_c                   26.0589(8)
_cell_measurement_reflns_used    4667
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      68.20
_cell_measurement_theta_min      5.31
_cell_volume                     2752.59(16)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_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      296(2)
_diffrn_measured_fraction_theta_full 0.968
_diffrn_measured_fraction_theta_max 0.968
_diffrn_measurement_device_type  'Bruker Nonius Apex II CCD area detector'
_diffrn_measurement_method       'phi and omega scans'
_diffrn_radiation_monochromator  'Montel 200 mirrors'
_diffrn_radiation_source         'Bruker Nonius FR591 rotating anode'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0181
_diffrn_reflns_av_sigmaI/netI    0.0253
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       28
_diffrn_reflns_limit_l_min       -31
_diffrn_reflns_number            10657
_diffrn_reflns_theta_full        69.20
_diffrn_reflns_theta_max         69.20
_diffrn_reflns_theta_min         5.31
_exptl_absorpt_coefficient_mu    0.686
_exptl_absorpt_correction_T_max  0.8982
_exptl_absorpt_correction_T_min  0.7806
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS; Sheldrick, 2003)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.232
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       BLOCK
_exptl_crystal_F_000             1080
_exptl_crystal_size_max          0.38
_exptl_crystal_size_mid          0.26
_exptl_crystal_size_min          0.16
_refine_diff_density_max         0.177
_refine_diff_density_min         -0.171
_refine_diff_density_rms         0.036
_refine_ls_abs_structure_details 'Flack H D (1983), 1771 Friedel pairs'
_refine_ls_abs_structure_Flack   0.1(2)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.281
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     346
_refine_ls_number_reflns         4602
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.281
_refine_ls_R_factor_all          0.0624
_refine_ls_R_factor_gt           0.0323
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0500P)^2^+0.1934P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0823
_refine_ls_wR_factor_ref         0.1160
_reflns_number_gt                3453
_reflns_number_total             4602
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol051096asi20050512_053955.cif
_cod_data_source_block           JL1R
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Orthorhombic' changed to
'orthorhombic' 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_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      P2(1)2(1)2(1)
_cod_database_code               1506625