Stereoselective quaternary center construction via atom-transfer radical cyclization using silicon tethers on acyclic precursors.
Duplessis, Martin; Waltz, Marie-Eve; Bencheqroun, Mohammed; Cardinal-David, Benoit; Guindon, Yvan; Organic letters 11 (2009) 3148–3151; doi:10.1021/ol901126y

data_1504011
_publ_section_title
;
 Stereoselective quaternary center construction via atom-transfer radical
 cyclization using silicon tethers on acyclic precursors.
;
_journal_issue                   14
_journal_name_full               'Organic letters'
_journal_page_first              3148
_journal_page_last               3151
_journal_paper_doi               10.1021/ol901126y
_journal_volume                  11
_journal_year                    2009
_chemical_absolute_configuration rmad
_chemical_compound_source        'Synthesized by the authors. See text'
_chemical_formula_moiety         'C9 H16 O4'
_chemical_formula_sum            'C9 H16 O4'
_chemical_formula_weight         188.22
_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            4
_cell_length_a                   6.2529(3)
_cell_length_b                   8.6287(3)
_cell_length_c                   18.3445(7)
_cell_measurement_reflns_used    2414
_cell_measurement_temperature    200(2)
_cell_measurement_theta_max      44.08
_cell_measurement_theta_min      5.67
_cell_volume                     989.77(7)
_computing_cell_refinement       'SMART (Bruker, 2001)'
_computing_data_collection       'SMART (Bruker, 2001)'
_computing_data_reduction        'SAINT (Bruker, 2003)'
_computing_molecular_graphics    'SHELXTL (Bruker, 1997)'
_computing_publication_material  'UdMX (local program)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      200(2)
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.991
_diffrn_measurement_device_type  'Bruker Smart 6000'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'rotating anode'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.034
_diffrn_reflns_av_sigmaI/netI    0.0439
_diffrn_reflns_limit_h_max       6
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            11234
_diffrn_reflns_theta_full        68.87
_diffrn_reflns_theta_max         68.87
_diffrn_reflns_theta_min         4.82
_diffrn_standards_decay_%        0.00
_diffrn_standards_number         57
_exptl_absorpt_coefficient_mu    0.823
_exptl_absorpt_correction_T_max  0.9400
_exptl_absorpt_correction_T_min  0.8300
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Sadabs (Sheldrick,1996)'
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.263
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle-like
_exptl_crystal_F_000             408
_exptl_crystal_size_max          0.16
_exptl_crystal_size_mid          0.06
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.139
_refine_diff_density_min         -0.143
_refine_diff_density_rms         0.033
_refine_ls_abs_structure_details 'Flack H D (1983), 715 Friedel Pairs'
_refine_ls_abs_structure_Flack   0.3(3)
_refine_ls_extinction_coef       0.0043(5)
_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_ref   1.060
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     124
_refine_ls_number_reflns         1812
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.060
_refine_ls_R_factor_all          0.0600
_refine_ls_R_factor_gt           0.0365
_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^)+(0.0233P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0645
_refine_ls_wR_factor_ref         0.0697
_reflns_number_gt                1254
_reflns_number_total             1812
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ol901126y_si_003.cif
_cod_data_source_block           guin36
_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 2.4.2 from 2011-04-26.

'_geom_bond_publ_flag'
value 'Y' changed to 'y' according to
/home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary named
'cif_core.dic' version 2.4.2 from 2011-04-26 (13
times).

'_geom_angle_publ_flag' value 'Y' changed to 'y' according
to /home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary
named 'cif_core.dic' version 2.4.2 from 2011-04-26 (20
times).

'_geom_torsion_publ_flag' value 'Y' changed to 'y' according
to /home/saulius/struct/CIF-dictionaries/cif_core.dic dictionary
named 'cif_core.dic' version 2.4.2 from 2011-04-26 (27 times).

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
;
_cod_original_sg_symbol_H-M      P212121
_cod_database_code               1504011