Ene-diene transmissive cycloaddition reactions with singlet oxygen: the vinylogous gem effect and its use for polyoxyfunctionalization of dienes.
Eske, Angelika; Goldfuss, Bernd; Griesbeck, Axel G.; de Kiff, Alan; Kleczka, Margarethe; Leven, Matthias; Neudörfl, Jörg-M; Vollmer, Moritz; The Journal of organic chemistry 79 (2014) 1818–1829; doi:10.1021/jo5000434

data_4028991
_publ_section_title
;
 Ene-diene transmissive cycloaddition reactions with singlet oxygen: the
 vinylogous gem effect and its use for polyoxyfunctionalization of dienes.
;
_journal_issue                   4
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              1818
_journal_page_last               1829
_journal_paper_doi               10.1021/jo5000434
_journal_volume                  79
_journal_year                    2014
_chemical_formula_moiety         'C9 H14 O4'
_chemical_formula_sum            'C9 H14 O4'
_chemical_formula_weight         186.20
_space_group_IT_number           61
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2ab'
_symmetry_space_group_name_H-M   'P b c a'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   6.0161(4)
_cell_length_b                   14.424(2)
_cell_length_c                   21.643(3)
_cell_measurement_reflns_used    6840
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      26.99
_cell_measurement_theta_min      2.82
_cell_volume                     1878.1(4)
_computing_cell_refinement       'Nonius DENZO (Otwinowski, Minor 1997)'
_computing_data_collection       'Nonius COLLECT'
_computing_data_reduction        'Nonius DENZO (Otwinowski, Minor 1997)'
_computing_molecular_graphics    'SCHAKAL99 (E. Keller 1999)'
_computing_publication_material  'PLATON (A. L. Spek 1980-2004)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       Phi/Omega-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  0.0548
_diffrn_reflns_av_sigmaI/netI    0.0762
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -5
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            6840
_diffrn_reflns_theta_full        26.99
_diffrn_reflns_theta_max         26.99
_diffrn_reflns_theta_min         2.82
_exptl_absorpt_coefficient_mu    0.103
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.317
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       needle
_exptl_crystal_F_000             800
_exptl_crystal_size_max          .4
_exptl_crystal_size_mid          .1
_exptl_crystal_size_min          .1
_refine_diff_density_max         0.216
_refine_diff_density_min         -0.210
_refine_diff_density_rms         0.047
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.008
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     141
_refine_ls_number_reflns         2033
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.008
_refine_ls_R_factor_all          0.0915
_refine_ls_R_factor_gt           0.0399
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0251P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0691
_refine_ls_wR_factor_ref         0.0785
_reflns_number_gt                1247
_reflns_number_total             2033
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo5000434_si_001.cif
_cod_data_source_block           mag108
_cod_original_sg_symbol_H-M      Pbca
_cod_database_code               4028991