Development of a Concise Synthesis of (+)-Ingenol.
McKerrall, Steven J.; Jørgensen, Lars; Kuttruff, Christian A.; Ungeheuer, Felix; Baran, Phil S.; Journal of the American Chemical Society 136 (2014) 5799–; doi:10.1021/ja501881p

data_4121663
_publ_section_title
;
 Development of a Concise Synthesis of (+)-Ingenol.
;
_journal_issue                   15
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              5799
_journal_paper_doi               10.1021/ja501881p
_journal_volume                  136
_journal_year                    2014
_chemical_absolute_configuration ad
_chemical_formula_moiety         'C27 H48 O2 Si2'
_chemical_formula_sum            'C27 H48 O2 Si2'
_chemical_formula_weight         460.83
_space_group_crystal_system      orthorhombic
_space_group_IT_number           19
_space_group_name_Hall           'P 2ac 2ab'
_space_group_name_H-M_alt        'P 21 21 21'
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 21'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-2012
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   14.3507(3)
_cell_length_b                   14.4432(3)
_cell_length_c                   14.5134(3)
_cell_measurement_reflns_used    9930
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      26.33
_cell_measurement_theta_min      2.44
_cell_volume                     3008.19(11)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-2012 (Sheldrick, 2012)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean '512 x 512'
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0291
_diffrn_reflns_av_unetI/netI     0.0276
_diffrn_reflns_Laue_measured_fraction_full 0.999
_diffrn_reflns_Laue_measured_fraction_max 0.999
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            25493
_diffrn_reflns_point_group_measured_fraction_full 0.999
_diffrn_reflns_point_group_measured_fraction_max 0.999
_diffrn_reflns_theta_full        25.000
_diffrn_reflns_theta_max         26.400
_diffrn_reflns_theta_min         1.996
_diffrn_source                   'Rotating Anode'
_exptl_absorpt_coefficient_mu    0.136
_exptl_absorpt_correction_T_max  0.7454
_exptl_absorpt_correction_T_min  0.6190
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.018
_exptl_crystal_density_meas      ?
_exptl_crystal_description       Block
_exptl_crystal_F_000             1016
_exptl_crystal_size_max          0.217
_exptl_crystal_size_mid          0.091
_exptl_crystal_size_min          0.053
_refine_diff_density_max         0.201
_refine_diff_density_min         -0.154
_refine_diff_density_rms         0.033
_refine_ls_abs_structure_details
; 
 Flack x determined using 2406 quotients [(I+)-(I-)]/[(I+)+(I-)] 
 (Parsons and Flack (2004), Acta Cryst. A60, s61). 
;
_refine_ls_abs_structure_Flack   -0.05(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.028
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     300
_refine_ls_number_reflns         6164
_refine_ls_number_restraints     3
_refine_ls_restrained_S_all      1.028
_refine_ls_R_factor_all          0.0330
_refine_ls_R_factor_gt           0.0289
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
; 
 w=1/[\s^2^(Fo^2^)+(0.0386P)^2^+0.4458P] 
 where P=(Fo^2^+2Fc^2^)/3 
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0710
_refine_ls_wR_factor_ref         0.0737
_reflns_Friedel_coverage         0.785
_reflns_Friedel_fraction_full    1.000
_reflns_Friedel_fraction_max     0.998
_reflns_number_gt                5725
_reflns_number_total             6164
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            ja501881p_si_007.cif
_cod_data_source_block           Baran281
_cod_depositor_comments
;Adding full bibliography for 4121658--4121664.cif.

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_database_code               4121663
_shelx_estimated_absorpt_t_min   0.971
_shelx_estimated_absorpt_t_max   0.993
_shelxl_version_number           2012-9
_shelx_res_checksum              48793
_shelx_hkl_checksum              90149