Harvesting the strain installed by a Paternò-Büchi step in a synthetically useful way: high-yielding photoprotolytic oxametathesis in polycyclic systems.
Valiulin, Roman A.; Kutateladze, Andrei G.; Organic letters 11 (2009) 3886–3889; doi:10.1021/ol901456m

data_1504092
_publ_section_title
;
 Harvesting the strain installed by a Patern\`o-B\"uchi step in a
 synthetically useful way: high-yielding photoprotolytic oxametathesis in
 polycyclic systems.
;
_journal_issue                   17
_journal_name_full               'Organic letters'
_journal_page_first              3886
_journal_page_last               3889
_journal_paper_doi               10.1021/ol901456m
_journal_volume                  11
_journal_year                    2009
_chemical_compound_source        'synthesized by rav'
_chemical_formula_moiety         'C23 H20 O2'
_chemical_formula_sum            'C23 H20 O2'
_chemical_formula_weight         328.403
_chemical_name_common            'tetracyclic oxetane'
_chemical_name_systematic
exo-11-benzoyl-4-phenyl3-oxatetracyclo[4.3.2.0(4,10).0(7,9)]undecane
_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   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 108.722(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   16.7615(5)
_cell_length_b                   10.1571(3)
_cell_length_c                   20.7291(6)
_cell_measurement_reflns_used    9795
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      28.5494
_cell_measurement_theta_min      2.2576
_cell_volume                     3342.36(17)
_computing_cell_refinement       'Apex2/SAINT (Bruker)'
_computing_data_collection       'Apex2 (Bruker)'
_computing_data_reduction        'Apex2 (Bruker)'
_computing_molecular_graphics    'XSHELL (Bruker)'
_computing_publication_material  'Apex2/enCIFer (Bruker/CCDC)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      100(2)
_diffrn_detector_area_resol_mean 8.33
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker D8 APEXII Diffractometer'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0506
_diffrn_reflns_av_sigmaI/netI    0.0228
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -22
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            102382
_diffrn_reflns_theta_full        28.28
_diffrn_reflns_theta_max         28.28
_diffrn_reflns_theta_min         1.37
_diffrn_source                   'fine-focus sealed tube'
_diffrn_source_type              'Siemens KFFMO2K-90'
_exptl_absorpt_coefficient_mu    0.083
_exptl_absorpt_correction_T_max  0.98
_exptl_absorpt_correction_T_min  0.96
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
'Sheldric, G. M. (2009) Univ. of G\"ottingen, Germany'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.305
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       parallelepiped
_exptl_crystal_F_000             1400
_exptl_crystal_recrystallization_method 'hexane ethanol'
_exptl_crystal_size_max          0.54
_exptl_crystal_size_mid          0.38
_exptl_crystal_size_min          0.22
_refine_diff_density_max         1.263
_refine_diff_density_min         -0.948
_refine_diff_density_rms         0.087
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.948
_refine_ls_hydrogen_treatment    none
_refine_ls_matrix_type           full
_refine_ls_number_parameters     451
_refine_ls_number_reflns         8298
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.948
_refine_ls_R_factor_all          0.1191
_refine_ls_R_factor_gt           0.0916
_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^)+(0.1374P)^2^+8.9822P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2405
_refine_ls_wR_factor_ref         0.2761
_reflns_number_gt                6296
_reflns_number_total             8298
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol901456m_si_004.cif
_cod_data_source_block           xx
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               1504092