Biomimetic Synthesis and Structural Reassignment of the Tridachiahydropyrones
Pallavi Sharma; Barry Lygo; William Lewis; John E. Moses; Journal of the American Chemical Society 131 (2009) 5966–5972; doi:10.1021/ja900369z

data_4104247
_publ_section_title
;
 Biomimetic Synthesis and Structural Reassignment of the
 Tridachiahydropyrones
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              5966
_journal_page_last               5972
_journal_paper_doi               10.1021/ja900369z
_journal_volume                  131
_journal_year                    2009
_chemical_formula_moiety         'C21 H30 O3'
_chemical_formula_sum            'C21 H30 O3'
_chemical_formula_weight         330.45
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           'enCIFer editing of SHELXL-97 file'
_cell_angle_alpha                92.919(2)
_cell_angle_beta                 103.854(2)
_cell_angle_gamma                113.448(2)
_cell_formula_units_Z            2
_cell_length_a                   8.6581(10)
_cell_length_b                   9.8765(12)
_cell_length_c                   12.8693(16)
_cell_measurement_reflns_used    3511
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      27.45
_cell_measurement_theta_min      2.28
_cell_volume                     966.9(2)
_computing_cell_refinement       'Bruker SAINT version 6.36A (Bruker, 2002)'
_computing_data_collection       'Bruker SMART version 5.625 (Bruker, 2001)'
_computing_data_reduction        'Bruker SAINT; SHELXTL (Sheldrick, 2008)'
_computing_molecular_graphics    ' ?'
_computing_publication_material  'enCIFer(Allen et al.,2004);PLATON(Spek,2003)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      150(2)
_diffrn_measured_fraction_theta_full 0.980
_diffrn_measured_fraction_theta_max 0.980
_diffrn_measurement_device_type  'Bruker SMART APEX CCD area detector'
_diffrn_measurement_method       \w
_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  0.0712
_diffrn_reflns_av_sigmaI/netI    0.0689
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       12
_diffrn_reflns_limit_k_min       -12
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            8449
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_reflns_theta_min         2.28
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.074
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.135
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             360
_exptl_crystal_size_max          0.53
_exptl_crystal_size_mid          0.40
_exptl_crystal_size_min          0.37
_refine_diff_density_max         0.318
_refine_diff_density_min         -0.235
_refine_diff_density_rms         0.043
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.071
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     225
_refine_ls_number_reflns         4355
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.071
_refine_ls_R_factor_all          0.0628
_refine_ls_R_factor_gt           0.0496
_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^)+(0.0514P)^2^+0.0846P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1258
_refine_ls_wR_factor_ref         0.1341
_reflns_number_gt                3377
_reflns_number_total             4355
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja900369z_si_001.cif
_cod_data_source_block           tmrprp
_cod_database_code               4104247