Enantioselective Reformatsky reaction of ethyl iododifluoroacetate with ketones.
Fornalczyk, Michal; Singh, Kuldip; Stuart, Alison M.; Organic & biomolecular chemistry 10 (2012) 3332–3342; doi:10.1039/c2ob25081k

data_7152296
_publ_section_title
;
 Enantioselective Reformatsky reaction of ethyl iododifluoroacetate with
 ketones.
;
_journal_issue                   16
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              3332
_journal_page_last               3342
_journal_paper_doi               10.1039/c2ob25081k
_journal_volume                  10
_journal_year                    2012
_chemical_absolute_configuration ,unk
_chemical_formula_moiety         'C20 H21 F2 N O2'
_chemical_formula_sum            'C20 H21 F2 N O2'
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_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
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_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.5802(18)
_cell_length_b                   9.972(2)
_cell_length_c                   19.406(4)
_cell_measurement_reflns_used    1014
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      25.299
_cell_measurement_theta_min      2.596
_cell_volume                     1660.4(6)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SHELXTL'
_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      150(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Bruker Apex 2000 CCD area detector'
_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  0.0704
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_diffrn_reflns_limit_k_max       11
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_diffrn_reflns_limit_l_max       23
_diffrn_reflns_limit_l_min       -23
_diffrn_reflns_number            11962
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.10
_exptl_absorpt_coefficient_mu    0.104
_exptl_absorpt_correction_T_max  0.9816
_exptl_absorpt_correction_T_min  0.9715
_exptl_absorpt_correction_type   empirical
_exptl_absorpt_process_details
;
absorption correction based on 6405 reflections(SADABS);Rint 0.1520 before
correction and 0.0543 after.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.382
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             728
_exptl_crystal_size_max          0.28
_exptl_crystal_size_mid          0.20
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.348
_refine_diff_density_min         -0.269
_refine_diff_density_rms         0.043
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.0(8)
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_refine_ls_number_parameters     227
_refine_ls_number_reflns         2917
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.034
_refine_ls_R_factor_all          0.0477
_refine_ls_R_factor_gt           0.0421
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0505P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0954
_refine_ls_wR_factor_ref         0.0981
_reflns_number_gt                2639
_reflns_number_total             2917
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2ob25081k.txt
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_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               7152296