Expedient route to the tigliane-daphnane skeleton via oxonium ylide [1,2]-shift.
Stewart, Craig; McDonald, Robert; West, F. G.; Organic letters 13 (2011) 720–723; doi:10.1021/ol102953s

data_1501937
_publ_section_title
;
 Expedient route to the tigliane-daphnane skeleton via oxonium ylide
 [1,2]-shift.
;
_journal_issue                   4
_journal_name_full               'Organic letters'
_journal_page_first              720
_journal_page_last               723
_journal_paper_doi               10.1021/ol102953s
_journal_volume                  13
_journal_year                    2011
_chemical_formula_moiety         'C24 H28 O6'
_chemical_formula_sum            'C24 H28 O6'
_chemical_formula_weight         412.46
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/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                 100.2038(12)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   12.2754(13)
_cell_length_b                   17.8152(18)
_cell_length_c                   9.4850(10)
_cell_measurement_reflns_used    7118
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.50
_cell_measurement_theta_min      2.46
_cell_volume                     2041.5(4)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker SMART 1000 CCD'
_diffrn_measurement_method       '\w scans'
_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  0.0290
_diffrn_reflns_av_sigmaI/netI    0.0254
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            16984
_diffrn_reflns_theta_full        27.52
_diffrn_reflns_theta_max         27.52
_diffrn_reflns_theta_min         1.69
_exptl_absorpt_coefficient_mu    0.096
_exptl_absorpt_correction_T_max  0.9829
_exptl_absorpt_correction_T_min  0.9383
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2008)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.342
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             880
_exptl_crystal_size_max          0.67
_exptl_crystal_size_mid          0.23
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.355
_refine_diff_density_min         -0.198
_refine_diff_density_rms         0.053
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.034
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     271
_refine_ls_number_reflns         4683
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.034
_refine_ls_R_factor_all          0.0693
_refine_ls_R_factor_gt           0.0485
_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^)+(0.0640P)^2^+0.6509P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1146
_refine_ls_wR_factor_ref         0.1291
_reflns_number_gt                3508
_reflns_number_total             4683
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ol102953s_si_002.cif
_cod_data_source_block           17b
_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      'P 21/c'
_cod_database_code               1501937