On the origins of diastereoselectivity in the conjugate additions of the antipodes of lithium N-benzyl-(N-α-methylbenzyl)amide to enantiopure cis- and trans-dioxolane containing α,β-unsaturated esters.
Davies, Stephen G.; Foster, Emma M.; Frost, Aileen B.; Lee, James A.; Roberts, Paul M.; Thomson, James E.; Organic & biomolecular chemistry 10 (2012) 6186–6200; doi:10.1039/c2ob25099c

data_7152461
_publ_section_title
;
 On the origins of diastereoselectivity in the conjugate additions of the
 antipodes of lithium N-benzyl-(N-\a-methylbenzyl)amide to enantiopure
 cis- and trans-dioxolane containing \a,\b-unsaturated esters.
;
_journal_issue                   30
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              6186
_journal_page_last               6200
_journal_paper_doi               10.1039/c2ob25099c
_journal_volume                  10
_journal_year                    2012
_chemical_absolute_configuration (3S,4R,5S,\aR)
_chemical_formula_moiety         'C28 H39 N1 O4'
_chemical_formula_sum            'C28 H39 N O4'
_chemical_formula_weight         453.62
_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
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.3260(2)
_cell_length_b                   13.7383(3)
_cell_length_c                   20.3169(6)
_cell_measurement_reflns_used    3213
_cell_measurement_temperature    150
_cell_measurement_theta_max      27
_cell_measurement_theta_min      5
_cell_volume                     2603.07(11)
_computing_cell_refinement       'DENZO/SCALEPACK (Otwinowski & Minor, 1997)'
_computing_data_collection       'COLLECT (Nonius, 2001).'
_computing_data_reduction        'DENZO/SCALEPACK (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'CAMERON (Watkin et al., 1996)'
_computing_publication_material  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_refinement  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_solution    'SIR92 (Altomare et al., 1994)'
_diffrn_ambient_temperature      150
_diffrn_measured_fraction_theta_full 0.989
_diffrn_measured_fraction_theta_max 0.988
_diffrn_measurement_device       Area
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.028
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       26
_diffrn_reflns_limit_l_min       -26
_diffrn_reflns_number            5803
_diffrn_reflns_theta_full        26.927
_diffrn_reflns_theta_max         27.476
_diffrn_reflns_theta_min         5.233
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.076
_exptl_absorpt_correction_T_max  0.99
_exptl_absorpt_correction_T_min  0.99
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'DENZO/SCALEPACK (Otwinowski & Minor, 1997)'
_exptl_crystal_colour            colourless
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_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             984
_exptl_crystal_size_max          0.160
_exptl_crystal_size_mid          0.150
_exptl_crystal_size_min          0.120
_refine_diff_density_max         0.19
_refine_diff_density_min         -0.20
_refine_ls_extinction_method     None
_refine_ls_goodness_of_fit_ref   0.9590
_refine_ls_hydrogen_treatment    none
_refine_ls_matrix_type           full
_refine_ls_number_parameters     298
_refine_ls_number_reflns         2639
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.0451
_refine_ls_R_factor_gt           0.0364
_refine_ls_shift/su_max          0.0003663
_refine_ls_shift/su_mean         0.0000320
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
;
Method, part 1, Chebychev polynomial, (Watkin, 1994, Prince, 1982)
[weight] = 1.0/[A~0~*T~0~(x)+A~1~*T~1~(x) ... +A~n-1~]*T~n-1~(x)]
where A~i~ are the Chebychev coefficients listed below and x= Fcalc/Fmax
Method = Robust Weighting (Prince, 1982)
W = [weight] * [1-(deltaF/6*sigmaF)^2^]^2^
A~i~ are:
20.9 31.6 16.3 4.67
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0984
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_refine_ls_wR_factor_ref         0.0984
_reflns_limit_h_max              12
_reflns_limit_h_min              0
_reflns_limit_k_max              17
_reflns_limit_k_min              0
_reflns_limit_l_max              26
_reflns_limit_l_min              0
_reflns_number_gt                2305
_reflns_number_total             3316
_reflns_threshold_expression     I>2.0\s(I)
_oxford_diffrn_Wilson_B_factor   3.00
_oxford_diffrn_Wilson_scale      2.56
_oxford_refine_ls_r_factor_ref   0.0451
_oxford_refine_ls_scale          0.6285(16)
_oxford_reflns_number_all        2639
_oxford_reflns_threshold_expression_ref I>-3.0\s(I)
_cod_data_source_file            c2ob25099c.txt
_cod_data_source_block           69
_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 1891 2012-01-12 08:04:46Z andrius 
;
_cod_original_formula_sum        'C28 H39 N1 O4'
_cod_database_code               7152461