Development of an approach to the synthesis of the ABC ring system of Hemibrevetoxin B.
Crawford, Claire; Nelson, Adam; Patel, Ian; Organic letters 8 (2006) 4231–4234; doi:10.1021/ol0614323

data_1506146
_publ_section_title
;
 Development of an approach to the synthesis of the ABC ring system of
 Hemibrevetoxin B.
;
_journal_issue                   19
_journal_name_full               'Organic letters'
_journal_page_first              4231
_journal_page_last               4234
_journal_paper_doi               10.1021/ol0614323
_journal_volume                  8
_journal_year                    2006
_chemical_formula_moiety         'C18 H28 O4'
_chemical_formula_sum            'C18 H28 O4'
_chemical_formula_weight         308.40
_space_group_IT_number           9
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'C -2yc'
_symmetry_space_group_name_H-M   'C 1 c 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                 111.737(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   20.8896(7)
_cell_length_b                   8.0132(4)
_cell_length_c                   11.0490(4)
_cell_measurement_reflns_used    15704
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      1.00
_cell_volume                     1718.01(13)
_computing_cell_refinement       'DENZO-SMN (Otwinowski & Minor, 1996)'
_computing_data_collection       COLLECT
_computing_data_reduction
;
DENZO-SMN and COLLECT (Otwinowski & Minor, 1996)
;
_computing_molecular_graphics    ORTEP-III
_computing_publication_material  'local program'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type
;
Nonius KappaCCD area-detector diffractometer
;
_diffrn_measurement_method
;       
phi and omega scans to fill the asymmetric unit
;
_diffrn_radiation_detector       'CCD plate'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1661
_diffrn_reflns_av_sigmaI/netI    0.0687
_diffrn_reflns_limit_h_max       25
_diffrn_reflns_limit_h_min       -25
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            12086
_diffrn_reflns_theta_full        26.00
_diffrn_reflns_theta_max         26.00
_diffrn_reflns_theta_min         3.16
_diffrn_standards_decay_%        0
_diffrn_standards_interval_count 0
_diffrn_standards_interval_time  0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.083
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.192
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       fragment
_exptl_crystal_F_000             672
_exptl_crystal_size_max          0.27
_exptl_crystal_size_mid          0.16
_exptl_crystal_size_min          0.07
_refine_diff_density_max         0.234
_refine_diff_density_min         -0.333
_refine_diff_density_rms         0.069
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.046
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     200
_refine_ls_number_reflns         1683
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.045
_refine_ls_R_factor_all          0.0530
_refine_ls_R_factor_gt           0.0483
_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^)+(0.0678P)^2^+0.4015P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1182
_refine_ls_wR_factor_ref         0.1234
_reflns_number_gt                1548
_reflns_number_total             1683
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol0614323si20060728_053221.cif
_cod_data_source_block           cft95
_cod_original_cell_volume        1718.01(12)
_cod_original_sg_symbol_H-M      Cc
_cod_database_code               1506146