Synthesis of (2S,3R)-[3',3',3'-2H3]-valine and (2S,3S)-4-fluorovaline.
Charrier, Jean-Damien; Hitchcock, Peter B.; Young, Douglas W.; Organic & biomolecular chemistry 2 (2004) 1310–1314; doi:10.1039/b401646g

data_7151613
_publ_section_title
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 Synthesis of (2S,3R)-[3',3',3'-2H3]-valine and (2S,3S)-4-fluorovaline.
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_journal_issue                   9
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              1310
_journal_page_last               1314
_journal_paper_doi               10.1039/b401646g
_journal_volume                  2
_journal_year                    2004
_chemical_absolute_configuration syn
_chemical_formula_sum            'C27 H34 D3 N O4 Si'
_chemical_formula_weight         470.7
_chemical_name_systematic
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?
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_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
_cell_angle_alpha                90.00
_cell_angle_beta                 105.26(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   9.767(5)
_cell_length_b                   13.052(4)
_cell_length_c                   11.178(4)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      18
_cell_measurement_theta_min      12
_cell_volume                     1374.7(10)
_computing_cell_refinement       'Enraf-Nonius CAD4'
_computing_data_collection       'Enraf-Nonius CAD4'
_computing_publication_material  SHELXL-93
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measurement_device       ' Enraf-Nonius CAD4'
_diffrn_measurement_method       \w--2\q
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.5418
_diffrn_reflns_av_R_equivalents  0.0402
_diffrn_reflns_av_sigmaI/netI    0.0540
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       0
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            2272
_diffrn_reflns_theta_max         59.99
_diffrn_reflns_theta_min         4.10
_diffrn_standards_decay_%        0
_diffrn_standards_interval_time  120
_diffrn_standards_number         2
_exptl_absorpt_coefficient_mu    0.991
_exptl_absorpt_correction_type   none
_exptl_crystal_density_diffrn    1.137
_exptl_crystal_F_000             504
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.1
_exptl_crystal_size_min          0.1
_refine_diff_density_max         0.205
_refine_diff_density_min         -0.213
_refine_diff_density_rms         0.045
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.08(5)
_refine_ls_extinction_coef       0.0124(12)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_all   1.047
_refine_ls_goodness_of_fit_obs   1.058
_refine_ls_hydrogen_treatment    riding
_refine_ls_matrix_type           full
_refine_ls_number_parameters     299
_refine_ls_number_reflns         2145
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.046
_refine_ls_restrained_S_obs      1.058
_refine_ls_R_factor_all          0.0595
_refine_ls_R_factor_obs          0.0479
_refine_ls_shift/esd_max         -0.001
_refine_ls_shift/esd_mean        0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0745P)^2^+0.0261P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1277
_refine_ls_wR_factor_obs         0.1173
_reflns_number_observed          1819
_reflns_number_total             2145
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            b401646g.txt
_cod_data_source_block           apr1098
_cod_depositor_comments
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The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0745P)^2^+0.0261P] where P=(Fo^2^+2Fc^2^)/3' was
changed to 'calc'. New tag '_refine_ls_weighting_details' was
created. The value of the new tag was set to
'w=1/[\s^2^(Fo^2^)+(0.0745P)^2^+0.0261P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
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_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               7151613