A photocycloaddition/fragmentation approach toward the 3,12-dioxatricyclo[8.2.1.0(6,13)]tridecane skeleton of terpenoid natural products.
Hehn, Jörg P; Herdtweck, Eberhardt; Bach, Thorsten; Organic letters 13 (2011) 1892–1895; doi:10.1021/ol2004462

data_1502102
_publ_section_title
;
 A photocycloaddition/fragmentation approach toward the
 3,12-dioxatricyclo[8.2.1.0(6,13)]tridecane skeleton of terpenoid natural
 products.
;
_journal_issue                   7
_journal_name_full               'Organic letters'
_journal_page_first              1892
_journal_page_last               1895
_journal_paper_doi               10.1021/ol2004462
_journal_volume                  13
_journal_year                    2011
_chemical_formula_moiety         'C14 H20 O3'
_chemical_formula_sum            'C14 H20 O3'
_chemical_formula_weight         236.30
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_symmetry_space_group_name_Hall  '-P 2yn'
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_atom_sites_solution_hydrogens   difmap
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_cell_angle_alpha                90
_cell_angle_beta                 100.170(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.3811(5)
_cell_length_b                   9.7531(5)
_cell_length_c                   13.3506(7)
_cell_measurement_reflns_used    9060
_cell_measurement_temperature    123(1)
_cell_measurement_theta_max      25.38
_cell_measurement_theta_min      2.46
_cell_volume                     1202.32(11)
_computing_cell_refinement       'SAINT (Bruker, 2008b)'
_computing_data_collection       'APEX II Control Software (Bruker, 2008a)'
_computing_data_reduction        'SAINT (Bruker, 2008b)'
_computing_molecular_graphics    'PLATON (Spek, 2009)'
_computing_publication_material  'PLATON (Spek, 2009)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1998)'
_computing_structure_solution    'SIR92 (Altomare, 1994)'
_diffrn_ambient_temperature      123(1)
_diffrn_detector                 ' CCD plate '
_diffrn_detector_area_resol_mean 16
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.994
_diffrn_measurement_device       ' \k-geometry diffractometer '
_diffrn_measurement_device_type  ' Bruker APEX-II CCD '
_diffrn_measurement_method       ' phi- and omega-rotation '
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'rotating anode FR591'
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0359
_diffrn_reflns_av_sigmaI/netI    0.0152
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       9
_diffrn_reflns_limit_k_min       -11
_diffrn_reflns_limit_l_max       16
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            26321
_diffrn_reflns_theta_full        25.38
_diffrn_reflns_theta_max         25.38
_diffrn_reflns_theta_min         2.46
_diffrn_standards_decay_%        0
_exptl_absorpt_coefficient_mu    0.090
_exptl_absorpt_correction_T_max  0.7452
_exptl_absorpt_correction_T_min  0.6589
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS, Bruker, 2008b'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.305
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    none
_exptl_crystal_description       plate
_exptl_crystal_F_000             512
_exptl_crystal_size_max          0.66
_exptl_crystal_size_mid          0.46
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.331
_refine_diff_density_min         -0.210
_refine_diff_density_rms         0.039
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.030
_refine_ls_hydrogen_treatment    refall
_refine_ls_matrix_type           full
_refine_ls_number_parameters     234
_refine_ls_number_reflns         2190
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.030
_refine_ls_R_factor_all          0.0366
_refine_ls_R_factor_gt           0.0346
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0429P)^2^+0.6176P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      sigma
_refine_ls_wR_factor_gt          0.0878
_refine_ls_wR_factor_ref         0.0899
_reflns_number_gt                2068
_reflns_number_total             2190
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ol2004462_si_003.cif
_cod_data_source_block           compound_16
_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 

The following automatic conversions were performed:

'_exptl_crystal_density_meas' value 'none' was changed to '?' - the
value is perceived as not measured.

Automatic conversion script
Id: cif_fix_values 3008 2015-01-20 13:52:24Z robertas 
;
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               1502102