Synthesis of the fused polyether core of hemibrevetoxin B by two-directional ring-closing metathesis.
Clark, J. Stephen; Grainger, Damian M.; Ehkirch, Alexandra A.-C.; Blake, Alexander J.; Wilson, Claire; Organic letters 9 (2007) 1033–1036; doi:10.1021/ol0630651

data_1505305
_publ_section_title
;
 Synthesis of the fused polyether core of hemibrevetoxin B by
 two-directional ring-closing metathesis.
;
_journal_issue                   6
_journal_name_full               'Organic letters'
_journal_page_first              1033
_journal_page_last               1036
_journal_paper_doi               10.1021/ol0630651
_journal_volume                  9
_journal_year                    2007
_chemical_absolute_configuration syn
_chemical_formula_moiety         'C9 H12 O4'
_chemical_formula_sum            'C9 H12 O4'
_chemical_formula_weight         184.19
_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           'enCIFer editing of SHELXL97 CIF output'
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.5707(6)
_cell_length_b                   8.7506(8)
_cell_length_c                   15.3161(14)
_cell_measurement_reflns_used    5782
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      27.5
_cell_measurement_theta_min      2.3
_cell_volume                     880.64(14)
_computing_cell_refinement       'Bruker SAINT version 6.36a (Bruker, 2002)'
_computing_data_collection       'Bruker SMART version 5.624 (Bruker, 2001)'
_computing_data_reduction        'Bruker SAINT; Bruker SHELXTL (Bruker, 2001)'
_computing_molecular_graphics    'PLATON (Spek, 2003)'
_computing_publication_material  'enCIFer (Allen et al., 2004); PLATON'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1998)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.990
_diffrn_measurement_device_type  'Bruker SMART1000 CCD area detector'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.115
_diffrn_reflns_av_sigmaI/netI    0.055
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       11
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            8038
_diffrn_reflns_theta_full        27.50
_diffrn_reflns_theta_max         27.55
_diffrn_reflns_theta_min         2.66
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.109
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.389
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       column
_exptl_crystal_F_000             392
_exptl_crystal_size_max          0.65
_exptl_crystal_size_mid          0.36
_exptl_crystal_size_min          0.33
_refine_diff_density_max         0.20
_refine_diff_density_min         -0.20
_refine_diff_density_rms         0.04
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   'not established'
_refine_ls_extinction_coef       0.232(13)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.13
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     119
_refine_ls_number_reflns         1198
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.13
_refine_ls_R_factor_all          0.0313
_refine_ls_R_factor_gt           0.0303
_refine_ls_shift/su_max          0.005
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.027P)^2^+0.102P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0790
_refine_ls_wR_factor_ref         0.0800
_reflns_number_gt                1151
_reflns_number_total             1198
_reflns_threshold_expression     >2\s(I)
_cod_data_source_file            ol0630651si20061221_114143.cif
_cod_data_source_block           6
_cod_depositor_comments
;
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.

'_exptl_absorpt_correction_type' value 'None' changed to
'none' 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_cell_volume        880.6(3)
_cod_database_code               1505305