Highly stereocontrolled synthesis of gem-difluoromethylenated azasugars: D- and L-1,4,6-trideoxy-4,4-difluoronojirimycin.
Wang, Ruo-Wen; Qing, Feng-Ling; Organic letters 7 (2005) 2189–2192; doi:10.1021/ol050558h

data_1506568
_publ_section_title
;
 Highly stereocontrolled synthesis of gem-difluoromethylenated azasugars:
 D- and L-1,4,6-trideoxy-4,4-difluoronojirimycin.
;
_journal_issue                   11
_journal_name_full               'Organic letters'
_journal_page_first              2189
_journal_page_last               2192
_journal_paper_doi               10.1021/ol050558h
_journal_volume                  7
_journal_year                    2005
_chemical_absolute_configuration ad
_chemical_formula_sum            'C6 H11 F2 N O2'
_chemical_formula_weight         167.16
_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            8
_cell_length_a                   9.6285(9)
_cell_length_b                   10.2351(9)
_cell_length_c                   15.0732(13)
_cell_measurement_reflns_used    4487
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      55.091
_cell_measurement_theta_min      4.811
_cell_volume                     1485.4(2)
_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      293(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  '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  0.0880
_diffrn_reflns_av_sigmaI/netI    0.0577
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            8702
_diffrn_reflns_theta_full        27.00
_diffrn_reflns_theta_max         27.00
_diffrn_reflns_theta_min         2.41
_exptl_absorpt_coefficient_mu    0.142
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.72331
_exptl_absorpt_correction_type   empirical
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.495
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             704
_exptl_crystal_size_max          0.511
_exptl_crystal_size_mid          0.488
_exptl_crystal_size_min          0.257
_refine_diff_density_max         0.263
_refine_diff_density_min         -0.265
_refine_diff_density_rms         0.052
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   1.1(6)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.035
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     287
_refine_ls_number_reflns         3231
_refine_ls_number_restraints     5
_refine_ls_restrained_S_all      1.036
_refine_ls_R_factor_all          0.0435
_refine_ls_R_factor_gt           0.0413
_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^)+(0.0527P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0978
_refine_ls_wR_factor_ref         0.0994
_reflns_number_gt                2998
_reflns_number_total             3231
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol050558hsi20050314_115827.cif
_cod_data_source_block           cd24522
_cod_depositor_comments
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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               1506568