Total synthesis of the marine metabolite (±)-polysiphenol via highly regioselective intramolecular oxidative coupling.
Barrett, Tim N.; Braddock, D. Christopher; Monta, Anna; Webb, Michael R.; White, Andrew J. P.; Journal of natural products 74 (2011) 1980–1984; doi:10.1021/np200596q

data_1501841
_publ_section_title
;
 Total synthesis of the marine metabolite (+-)-polysiphenol via highly
 regioselective intramolecular oxidative coupling.
;
_journal_issue                   9
_journal_name_full               'Journal of natural products'
_journal_page_first              1980
_journal_page_last               1984
_journal_paper_doi               10.1021/np200596q
_journal_volume                  74
_journal_year                    2011
_chemical_formula_moiety         'C18 H18 Br2 O4'
_chemical_formula_sum            'C18 H18 Br2 O4'
_chemical_formula_weight         458.14
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 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                 94.203(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   4.39738(9)
_cell_length_b                   13.7231(3)
_cell_length_c                   14.4505(4)
_cell_measurement_reflns_used    3966
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      72.3609
_cell_measurement_theta_min      3.0638
_cell_volume                     869.68(4)
_computing_cell_refinement       'CrysAlis RED, Oxford Diffraction Ltd'
_computing_data_collection       'CrysAlis CCD, Oxford Diffraction Ltd'
_computing_data_reduction        'CrysAlis RED, Oxford Diffraction Ltd'
_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      173(2)
_diffrn_detector_area_resol_mean 8.2556
_diffrn_measured_fraction_theta_full 0.988
_diffrn_measured_fraction_theta_max 0.988
_diffrn_measurement_device_type  'OD Xcalibur PX Ultra'
_diffrn_measurement_method       'omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'Enhance Ultra (Cu) X-ray Source'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0311
_diffrn_reflns_av_sigmaI/netI    0.0258
_diffrn_reflns_limit_h_max       5
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            6489
_diffrn_reflns_theta_full        72.51
_diffrn_reflns_theta_max         72.51
_diffrn_reflns_theta_min         4.45
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    6.082
_exptl_absorpt_correction_T_max  0.903
_exptl_absorpt_correction_T_min  0.577
_exptl_absorpt_correction_type   analytical
_exptl_absorpt_process_details
; 
CrysAlisPro, Oxford Diffraction Ltd., 
Version 1.171.34.44 (release 25-10-2010 CrysAlis171 .NET) 
(compiled Oct 25 2010,18:11:34) 
Analytical numeric absorption correction using a multifaceted crystal 
model based on expressions derived by R.C. Clark & J.S. Reid. 
(Clark, R. C. & Reid, J. S. (1995). Acta Cryst. A51, 887-897) 
;
_exptl_crystal_colour            Colourless
_exptl_crystal_density_diffrn    1.750
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needles
_exptl_crystal_F_000             456
_exptl_crystal_size_max          0.19
_exptl_crystal_size_mid          0.03
_exptl_crystal_size_min          0.02
_refine_diff_density_max         0.335
_refine_diff_density_min         -0.838
_refine_diff_density_rms         0.074
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.078
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     109
_refine_ls_number_reflns         1709
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.078
_refine_ls_R_factor_all          0.0368
_refine_ls_R_factor_gt           0.0302
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0424P)^2^+0.4730P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0781
_refine_ls_wR_factor_ref         0.0813
_reflns_number_gt                1480
_reflns_number_total             1709
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            np200596q_si_002.cif
_cod_data_source_block           E-13
_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 
;
_cod_original_sg_symbol_H-M      P2(1)/n
_cod_database_code               1501841