Total synthesis of (+/-)-pallambins C and D
Xue-Song Xu; Zhen-Wu Li; Yi-Jun Zhang; Xiao-Shui Peng; Henry N. C. Wong; Chem.Commun. 48 (2012) 8517–; doi:10.1039/c2cc34310j

data_7108190
_publ_section_title
;
 Total synthesis of (+/-)-pallambins C and D
;
_journal_name_full               Chem.Commun.
_journal_page_first              8517
_journal_paper_doi               10.1039/c2cc34310j
_journal_volume                  48
_journal_year                    2012
_chemical_formula_sum            'C20 H36 O3 Si'
_chemical_formula_weight         352.58
_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-97
_cell_angle_alpha                90.00
_cell_angle_beta                 90.516(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   11.6292(15)
_cell_length_b                   7.7435(11)
_cell_length_c                   12.2967(16)
_cell_measurement_temperature    243(2)
_cell_volume                     1107.3(3)
_computing_cell_refinement       SAINT(Bruker,2001)
_computing_data_collection       APEX2(Bruker,2003)
_computing_data_reduction        APEX2(Bruker,2003)
_computing_molecular_graphics    DIAMOND
_computing_publication_material  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      243(2)
_diffrn_measured_fraction_theta_full 0.998
_diffrn_measured_fraction_theta_max 0.998
_diffrn_measurement_device_type  'Bruker APEX II CCD diffractometer'
_diffrn_measurement_method       '\f and \w scan'
_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  0.0589
_diffrn_reflns_av_sigmaI/netI    0.0690
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -14
_diffrn_reflns_number            8522
_diffrn_reflns_theta_full        25.25
_diffrn_reflns_theta_max         25.25
_diffrn_reflns_theta_min         1.66
_exptl_absorpt_coefficient_mu    0.119
_exptl_absorpt_correction_T_max  0.9539
_exptl_absorpt_correction_T_min  0.9212
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.057
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             388
_exptl_crystal_size_max          0.70
_exptl_crystal_size_mid          0.50
_exptl_crystal_size_min          0.40
_refine_diff_density_max         0.214
_refine_diff_density_min         -0.259
_refine_diff_density_rms         0.040
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.04(13)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.038
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     217
_refine_ls_number_reflns         3770
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.038
_refine_ls_R_factor_all          0.0502
_refine_ls_R_factor_gt           0.0449
_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^)+(0.0707P)^2^+0.0143P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1185
_refine_ls_wR_factor_ref         0.1233
_reflns_number_gt                3429
_reflns_number_total             3770
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c2cc34310j.txt
_cod_data_source_block           a4
_cod_original_sg_symbol_H-M      P2(1)
_cod_database_code               7108190