Synthesis of the AB subunit of angelmicin B through a tandem alkoxy radical fragmentation-etherification sequence.
Li, Jialiang; Todaro, Louis J.; Mootoo, David R.; Organic letters 10 (2008) 1337–1340; doi:10.1021/ol703036y

data_1504545
_publ_section_title
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 Synthesis of the AB subunit of angelmicin B through a tandem alkoxy
 radical fragmentation-etherification sequence.
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_journal_issue                   7
_journal_name_full               'Organic letters'
_journal_page_first              1337
_journal_page_last               1340
_journal_paper_doi               10.1021/ol703036y
_journal_volume                  10
_journal_year                    2008
_chemical_absolute_configuration ad
_chemical_formula_sum            'C33 H48 O6 Si'
_chemical_formula_weight         568.80
_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                   6.3390(13)
_cell_length_b                   13.530(3)
_cell_length_c                   36.211(7)
_cell_measurement_temperature    100(2)
_cell_volume                     3105.7(11)
_computing_cell_refinement       'Bruker XSCANS'
_computing_data_collection       'Bruker XSCANS'
_computing_data_reduction        'Bruker SHELXTL'
_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 0.990
_diffrn_measured_fraction_theta_max 0.990
_diffrn_measurement_device_type  'Bruker-Nonius KappaCCD'
_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  0.0598
_diffrn_reflns_av_sigmaI/netI    0.0856
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       36
_diffrn_reflns_limit_l_min       -47
_diffrn_reflns_number            18725
_diffrn_reflns_theta_full        27.48
_diffrn_reflns_theta_max         27.48
_diffrn_reflns_theta_min         2.71
_exptl_absorpt_coefficient_mu    0.118
_exptl_absorpt_correction_T_max  0.9860
_exptl_absorpt_correction_T_min  0.9588
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details   numerical
_exptl_crystal_density_diffrn    1.217
_exptl_crystal_density_method    'not measured'
_exptl_crystal_F_000             1232
_exptl_crystal_size_max          0.36
_exptl_crystal_size_mid          0.18
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.371
_refine_diff_density_min         -0.340
_refine_diff_density_rms         0.059
_refine_ls_abs_structure_details
'Flack H D (1983), Acta Cryst. A39, 876-881, 2789 Friedel pairs '
_refine_ls_abs_structure_Flack   0.05(15)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.037
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     367
_refine_ls_number_reflns         6824
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.037
_refine_ls_R_factor_all          0.0897
_refine_ls_R_factor_gt           0.0578
_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^)+(0.0383P)^2^+1.5262P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1037
_refine_ls_wR_factor_ref         0.1155
_reflns_number_gt                5126
_reflns_number_total             6824
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol703036y-file004.cif
_cod_data_source_block           x1619l
_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 2.4.1 from 2010-06-29.

Automatic conversion script
Id: cif_fix_values 1715 2011-07-08 13:25:40Z adriana 
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_cod_original_sg_symbol_H-M      P212121
_cod_database_code               1504545