Diastereoselective oxidative carbon-carbon bond formation via silyl bis-enol ethers.
Avetta, Jr, Christopher T; Konkol, Leah C.; Taylor, Carla N.; Dugan, Karen C.; Stern, Charlotte L.; Thomson, Regan J.; Organic letters 10 (2008) 5621–5624; doi:10.1021/ol802516z

data_1504996
_publ_section_title
;
 Diastereoselective oxidative carbon-carbon bond formation via silyl
 bis-enol ethers.
;
_journal_issue                   24
_journal_name_full               'Organic letters'
_journal_page_first              5621
_journal_page_last               5624
_journal_paper_doi               10.1021/ol802516z
_journal_volume                  10
_journal_year                    2008
_chemical_absolute_configuration syn
_chemical_formula_sum            'C20 H22 O2'
_chemical_formula_weight         294.38
_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                   10.4888(17)
_cell_length_b                   12.241(2)
_cell_length_c                   12.347(2)
_cell_measurement_reflns_used    5491
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      28.88
_cell_measurement_theta_min      2.34
_cell_volume                     1585.3(4)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_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      100(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.929
_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  0.0409
_diffrn_reflns_av_sigmaI/netI    0.0195
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            14906
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         28.88
_diffrn_reflns_theta_min         2.34
_exptl_absorpt_coefficient_mu    0.078
_exptl_absorpt_correction_T_max  0.9794
_exptl_absorpt_correction_T_min  0.9572
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details   face-indexed
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.233
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             632
_exptl_crystal_size_max          0.600
_exptl_crystal_size_mid          0.422
_exptl_crystal_size_min          0.274
_refine_diff_density_max         0.299
_refine_diff_density_min         -0.166
_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(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.058
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     201
_refine_ls_number_reflns         2194
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.058
_refine_ls_R_factor_all          0.0392
_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^)+(0.0582P)^2^+0.3964P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0954
_refine_ls_wR_factor_ref         0.0979
_reflns_number_gt                2058
_reflns_number_total             2194
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol802516z_si_009.cif
_cod_data_source_block           s69ym
_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               1504996