Total Synthesis of (+)-Cymbodiacetal: A Re-evaluation of the Biomimetic Route
Maliha Uroos; William Lewis; Alexander J. Blake; Christopher J. Hayes; Journal of Organic Chemistry 75 (2010) 8465–8470; doi:10.1021/jo101691n

data_4025869
_publ_section_title
;
 Total Synthesis of (+)-Cymbodiacetal: A Re-evaluation of the Biomimetic
 Route
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              8465
_journal_page_last               8470
_journal_paper_doi               10.1021/jo101691n
_journal_volume                  75
_journal_year                    2010
_chemical_absolute_configuration rm
_chemical_formula_moiety         'C20 H30 O4'
_chemical_formula_sum            'C20 H30 O4'
_chemical_formula_weight         334.44
_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
'OH from difference map; others placed geometrically'
_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            16
_cell_length_a                   11.9009(19)
_cell_length_b                   21.480(3)
_cell_length_c                   29.011(5)
_cell_measurement_reflns_used    8815
_cell_measurement_temperature    150(2)
_cell_measurement_theta_max      26.08
_cell_measurement_theta_min      2.22
_cell_volume                     7416(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, 2009)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      150(2)
_diffrn_detector_area_resol_mean 8.366
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker SMART APEX CCD area detector'
_diffrn_measurement_method       '\w, \f'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.095
_diffrn_reflns_av_sigmaI/netI    0.043
_diffrn_reflns_limit_h_max       14
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       25
_diffrn_reflns_limit_k_min       -25
_diffrn_reflns_limit_l_max       34
_diffrn_reflns_limit_l_min       -34
_diffrn_reflns_number            89971
_diffrn_reflns_theta_full        25.10
_diffrn_reflns_theta_max         25.10
_diffrn_reflns_theta_min         2.02
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.082
_exptl_absorpt_correction_T_max  0.746
_exptl_absorpt_correction_T_min  0.652
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(SADABS 2007/2; Sheldrick, 1996)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.198
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       lath
_exptl_crystal_F_000             2912
_exptl_crystal_size_max          0.22
_exptl_crystal_size_mid          0.07
_exptl_crystal_size_min          0.04
_refine_diff_density_max         0.30
_refine_diff_density_min         -0.29
_refine_diff_density_rms         0.06
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.28
_refine_ls_hydrogen_treatment    'rigid rotor; riding model'
_refine_ls_matrix_type           full
_refine_ls_number_parameters     881
_refine_ls_number_reflns         7271
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.28
_refine_ls_R_factor_all          0.0924
_refine_ls_R_factor_gt           0.0884
_refine_ls_shift/su_max          0.010
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.042P)^2^+14.74P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.176
_refine_ls_wR_factor_ref         0.178
_reflns_number_gt                6942
_reflns_number_total             7271
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo101691n_si_003.cif
_cod_data_source_block           ocmuca
_cod_database_code               4025869