Enantioselective synthesis of beta-trifluoromethyl-beta-lactones via NHC-catalyzed ketene-ketone cycloaddition reactions.
Wang, Xiao-Na; Shao, Pan-Lin; Lv, Hui; Ye, Song; Organic letters 11 (2009) 4029–4031; doi:10.1021/ol901290z

data_1504045
_publ_section_title
;
 Enantioselective synthesis of beta-trifluoromethyl-beta-lactones via
 NHC-catalyzed ketene-ketone cycloaddition reactions.
;
_journal_issue                   18
_journal_name_full               'Organic letters'
_journal_page_first              4029
_journal_page_last               4031
_journal_paper_doi               10.1021/ol901290z
_journal_volume                  11
_journal_year                    2009
_chemical_absolute_configuration ad
_chemical_formula_sum            'C18 H14 Cl F3 O2'
_chemical_formula_weight         354.74
_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                 95.01(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   6.2698(13)
_cell_length_b                   7.4785(15)
_cell_length_c                   17.432(4)
_cell_measurement_reflns_used    2731
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      2.72
_cell_volume                     814.2(3)
_computing_cell_refinement       'CrystalClear (Rigaku Inc., 2008)'
_computing_data_collection       'CrystalClear (Rigaku Inc., 2008)'
_computing_data_reduction        'CrystalClear (Rigaku Inc., 2008)'
_computing_molecular_graphics    'XP in Siemens SHELXTL (Sheldrick, 1994)'
_computing_publication_material  'SHELX97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_detector_area_resol_mean 28.5714
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Saturn724+ CCD'
_diffrn_measurement_method       '\w scans at fixed \c = 45\%'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
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_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            9947
_diffrn_reflns_theta_full        27.47
_diffrn_reflns_theta_max         27.47
_diffrn_reflns_theta_min         2.97
_exptl_absorpt_coefficient_mu    0.273
_exptl_absorpt_correction_T_max  0.9679
_exptl_absorpt_correction_T_min  0.9176
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'CrystalClear (Rigaku Inc., 2008)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.447
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       pillar
_exptl_crystal_F_000             364
_exptl_crystal_size_max          0.32
_exptl_crystal_size_mid          0.21
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.206
_refine_diff_density_min         -0.140
_refine_diff_density_rms         0.037
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.06(6)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.053
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     219
_refine_ls_number_reflns         3595
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.053
_refine_ls_R_factor_all          0.0410
_refine_ls_R_factor_gt           0.0376
_refine_ls_shift/su_max          0.047
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0388P)^2^+0.1780P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0845
_refine_ls_wR_factor_ref         0.0868
_reflns_number_gt                3377
_reflns_number_total             3595
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol901290z_si_002.cif
_cod_data_source_block           sa13
_cod_depositor_comments
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The following automatic conversions were performed:

'_exptl_absorpt_correction_type' value 'Multi-scan' changed to
'multi-scan' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
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_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               1504045