Domino construction of a bullataketal core via double bond cleavage in activated dihydrofurans
Ivanov, Konstantin L.; Vatsouro, Ivan M.; Bezzubov, Stanislav I.; Melnikov, Mikhail Ya.; Budynina, Ekaterina M.; Organic Chemistry Frontiers 5 (2018) 1655–; doi:10.1039/C8QO00132D

data_1554263
_publ_section_title
;
 Domino construction of a bullataketal core via double bond cleavage in
 activated dihydrofurans
;
_journal_issue                   10
_journal_name_full               'Organic Chemistry Frontiers'
_journal_page_first              1655
_journal_paper_doi               10.1039/C8QO00132D
_journal_volume                  5
_journal_year                    2018
_chemical_formula_moiety         'C12 H14 O3'
_chemical_formula_sum            'C12 H14 O3'
_chemical_formula_weight         206.23
_chemical_melting_point_gt       399
_chemical_melting_point_lt       400
_chemical_name_systematic
;
6-Methoxy-9-methyl-8,10-dioxatricyclo[7.2.1.02,7]dodeca-2,4,6-triene
;
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           SHELXL-2014/7
_audit_update_record
;
2017-09-26 deposited with the CCDC.
2018-03-14 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 111.43(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   8.638(3)
_cell_length_b                   15.409(7)
_cell_length_c                   8.594(2)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      13.99
_cell_measurement_theta_min      12.97
_cell_volume                     1064.8(7)
_computing_cell_refinement       'Enraf-Nonius CAD4 Software package'
_computing_data_collection       'Enraf-Nonius CAD4 Software package'
_computing_data_reduction        'XCAD4PC (Harms, 1997)'
_computing_molecular_graphics    'SHELXTL (Sheldrick, 2008)'
_computing_publication_material  'SHELXTL (Sheldrick, 2008)'
_computing_structure_refinement  'SHELXL-2014/7 (Sheldrick, 2014)'
_computing_structure_solution    'SHELXTL (Sheldrick, 2008)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Enraf-Nonius CAD4'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0396
_diffrn_reflns_av_unetI/netI     0.0263
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       -10
_diffrn_reflns_limit_k_max       18
_diffrn_reflns_limit_k_min       -18
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            8160
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 1.000
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         25.962
_diffrn_reflns_theta_min         2.533
_diffrn_source                   'fine-focus sealed tube'
_diffrn_standards_decay_%        0
_diffrn_standards_interval_time  120
_diffrn_standards_number         2
_exptl_absorpt_coefficient_mu    0.092
_exptl_absorpt_correction_T_max  0.977
_exptl_absorpt_correction_T_min  0.969
_exptl_absorpt_correction_type   psi-scan
_exptl_absorpt_process_details   'SHELXTL (Bruker, 2008)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.286
_exptl_crystal_description       block
_exptl_crystal_F_000             440
_exptl_crystal_recrystallization_method
'Re-crystallisation from solvent: petroleum ether : ethyl acetate, 3:1'
_exptl_crystal_size_max          0.350
_exptl_crystal_size_mid          0.300
_exptl_crystal_size_min          0.250
_refine_diff_density_max         0.116
_refine_diff_density_min         -0.219
_refine_diff_density_rms         0.045
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.020
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     138
_refine_ls_number_reflns         2085
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.020
_refine_ls_R_factor_all          0.0720
_refine_ls_R_factor_gt           0.0393
_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^)+(0.0566P)^2^+0.1425P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0928
_refine_ls_wR_factor_ref         0.1071
_reflns_Friedel_coverage         0.000
_reflns_number_gt                1408
_reflns_number_total             2085
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c8qo00132d2.cif
_cod_data_source_block           4g
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               1554263
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_min   0.969
_shelx_estimated_absorpt_t_max   0.977
_shelx_res_checksum              78015
_shelx_hkl_checksum              76356