A formal total synthesis of platencin.
Austin, Kerrie A. B.; Banwell, Martin G.; Willis, Anthony C.; Organic letters 10 (2008) 4465–4468; doi:10.1021/ol801647h

data_1504872
_publ_section_title
;
 A formal total synthesis of platencin.
;
_journal_issue                   20
_journal_name_full               'Organic letters'
_journal_page_first              4465
_journal_page_last               4468
_journal_paper_doi               10.1021/ol801647h
_journal_volume                  10
_journal_year                    2008
_chemical_absolute_configuration rmad
_chemical_compound_source        local
_chemical_formula_moiety         'C21 H36 O3 Si'
_chemical_formula_sum            'C21 H36 O3 Si'
_chemical_formula_weight         364.60
_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
_audit_creation_date             07-06-29
_audit_creation_method           CRYSTALS_ver_12.18
_audit_update_record
;
2007-06-30 - Report on C21 H36 O3 Si
              by Anthony C. Willis
              for  Kerrie Austin and Martin Banwell

2007-06-30 - passes checkcif tests with minor warnings

;
_cell_angle_alpha                90
_cell_angle_beta                 91.0892(15)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   6.4028(1)
_cell_length_b                   11.4281(3)
_cell_length_c                   14.5733(3)
_cell_measurement_reflns_used    15443
_cell_measurement_temperature    200
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      2.6
_cell_volume                     1066.16(4)
_computing_cell_refinement       'Denzo/Scalepack (Otwinowski & Minor, 1997)'
_computing_data_collection       'COLLECT (Nonius BV, 1997)'
_computing_data_reduction        'Denzo/Scalepack (Otwinowski & Minor, 1997)'
_computing_molecular_graphics
;
ORTEP-II (Johnson 1976) in teXsan (MSC, 1992-1997)
;
_computing_publication_material  'CRYSTALS (Watkin et al 2003)'
_computing_structure_refinement  'CRYSTALS (Watkin et al 2003)'
_computing_structure_solution    'SIR92 (Altomare et al, 1994)'
_diffrn_ambient_temperature      200
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       ' \f and \w scans with CCD '
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.052
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -14
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            23742
_diffrn_reflns_theta_full        27.484
_diffrn_reflns_theta_max         27.484
_diffrn_reflns_theta_min         2.796
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.126
_exptl_absorpt_correction_T_max  0.991
_exptl_absorpt_correction_T_min  0.965
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details
;
via Gaussian method (Coppens, 1970) implemented in maXus (2000)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.136
_exptl_crystal_density_meas      ?
_exptl_crystal_description       plate
_exptl_crystal_F_000             400
_exptl_crystal_size_max          0.46
_exptl_crystal_size_mid          0.17
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.34
_refine_diff_density_min         -0.29
_refine_ls_abs_structure_details 'Flack (1983), 2308 Friedel-pairs'
_refine_ls_abs_structure_Flack   0.04(8)
_refine_ls_extinction_method     None
_refine_ls_goodness_of_fit_ref   1.1161
_refine_ls_hydrogen_treatment    noref
_refine_ls_matrix_type           full
_refine_ls_number_parameters     227
_refine_ls_number_reflns         3927
_refine_ls_number_restraints     1
_refine_ls_R_factor_all          0.0389
_refine_ls_R_factor_gt           0.0293
_refine_ls_shift/su_max          0.000547
_refine_ls_structure_factor_coef F
_refine_ls_weighting_details
;
  Method, part 1, Chebychev polynomial,
(Carruthers & Watkin, 1979, Prince, 1982)
  [weight] = 1.0/[A~0~*T~0~(x)+A~1~*T~1~(x) ... +A~n-1~]*T~n-1~(x)]
  where A~i~ are the Chebychev coefficients listed below and x= Fcalc/Fmax
  Method = Robust Weighting (Prince, 1982)
  W = [weight] * [1-(deltaF/6*sigmaF)^2^]^2^
  A~i~ are:
  1.06 0.0573 1.11 -0.0156 0.323
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0358
_refine_ls_wR_factor_gt          0.0322
_refine_ls_wR_factor_ref         0.0322
_reflns_limit_h_max              8
_reflns_limit_h_min              -8
_reflns_limit_k_max              14
_reflns_limit_k_min              -14
_reflns_limit_l_max              18
_reflns_limit_l_min              0
_reflns_number_gt                3927
_reflns_number_total             4871
_reflns_threshold_expression     I>3.0\s(I)
_oxford_diffrn_Wilson_B_factor   2.67
_oxford_diffrn_Wilson_scale      1.04
_oxford_refine_ls_scale          1.0012(11)
_oxford_structure_analysis_title '6291440 ban0733'
_cod_data_source_file            ol801647h_si_002.cif
_cod_data_source_block           ban0733
_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 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'not measured' was changed to '?'
- the value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_sg_symbol_H-M      'P 1 21 1 '
_cod_database_code               1504872