The effects of different ester and ketal protecting groups on the reactivity and selectivity of tartrate-derived silylketene acetals
Aggarwal, Varinder K.; Masters, Susannah J.; Adams, Harry; Spey, Sharon E.; Brown, George R.; Foubister, Alan J.; Journal of the Chemical Society, Perkin Transactions 1  (1999) 155–; doi:10.1039/a807863g

data_7212968
_publ_section_title
;
 The effects of different ester and ketal protecting groups on the
 reactivity and selectivity of tartrate-derived silylketene acetals
;
_journal_issue                   2
_journal_name_full
'Journal of the Chemical Society, Perkin Transactions 1'
_journal_page_first              155
_journal_paper_doi               10.1039/a807863g
_journal_year                    1999
_chemical_formula_sum            'C22 H32 O7'
_chemical_formula_weight         408.48
_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                 117.38(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   10.217(2)
_cell_length_b                   11.655(2)
_cell_length_c                   10.936(2)
_cell_measurement_temperature    293(2)
_cell_volume                     1156.4(5)
_computing_cell_refinement       'Siemens XSCANS'
_computing_data_collection       'Siemens XSCANS'
_computing_data_reduction        'Siemens SHELXTL'
_computing_molecular_graphics    'Siemens SHELXTL'
_computing_publication_material  'Siemens SHELXTL'
_computing_structure_refinement  'SHELXL-93 (Sheldrick, 1993)'
_computing_structure_solution    'SHELXS-86 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_measurement_device       'Siemens P4'
_diffrn_measurement_method       '\w 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  0.0833
_diffrn_reflns_av_sigmaI/netI    0.0543
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -1
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -1
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            2741
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.10
_exptl_absorpt_coefficient_mu    0.087
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.173
_exptl_crystal_description       prismatic
_exptl_crystal_F_000             440
_exptl_crystal_size_max          0.6
_exptl_crystal_size_mid          0.4
_exptl_crystal_size_min          0.2
_refine_diff_density_max         0.194
_refine_diff_density_min         -0.258
_refine_diff_density_rms         0.050
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.13(190)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   1.107
_refine_ls_goodness_of_fit_obs   1.002
_refine_ls_matrix_type           full
_refine_ls_number_parameters     291
_refine_ls_number_reflns         2325
_refine_ls_number_restraints     15
_refine_ls_restrained_S_all      1.337
_refine_ls_restrained_S_obs      1.001
_refine_ls_R_factor_all          0.0628
_refine_ls_R_factor_obs          0.0495
_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^)+(0.0717P)^2^+0.3857P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.1816
_refine_ls_wR_factor_obs         0.1253
_reflns_number_observed          2020
_reflns_number_total             2329
_reflns_observed_criterion       >2sigma(I)
_cod_data_source_file            807863Gsup1.cif
_cod_data_source_block           ova4
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
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 1891 2012-01-12 08:04:46Z andrius 

The following automatic conversions were performed:

'_refine_ls_weighting_scheme' value 'calc
w=1/[\s^2^(Fo^2^)+(0.0717P)^2^+0.3857P] 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^)+(0.0717P)^2^+0.3857P] where P=(Fo^2^+2Fc^2^)/3'.

Automatic conversion script
Id: cif_fix_values 3143 2015-03-26 13:38:13Z robertas 
;
_cod_original_cell_volume        1156.4(4)
_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               7212968