Oxidopyrylium-Alkene [5 + 2] Cycloaddition Conjugate Addition Cascade (C<sup>3</sup>) Sequences: Scope, Limitation, and Computational Investigations.
Kaufman, Riley H.; Law, Chunyin M.; Simanis, Justin A.; Woodall, Erica L.; Zwick, 3rd, Christian R; Wedler, Henry B.; Wendelboe, Paul; Hamaker, Christopher G.; Goodell, John R.; Tantillo, Dean J.; Mitchell, T. Andrew; The Journal of organic chemistry 83 (2018) 9818–9838; doi:10.1021/acs.joc.8b01322

data_4035145
_publ_section_title
;
 Oxidopyrylium-Alkene [5 + 2] Cycloaddition Conjugate Addition Cascade
 (C<sup>3</sup>) Sequences: Scope, Limitation, and Computational
 Investigations.
;
_journal_issue                   17
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              9818
_journal_page_last               9838
_journal_paper_doi               10.1021/acs.joc.8b01322
_journal_volume                  83
_journal_year                    2018
_chemical_formula_moiety         'C18 H30 O5 Si'
_chemical_formula_sum            'C18 H30 O5 Si'
_chemical_formula_weight         354.51
_chemical_name_common            'Zwick/TAM II-4 f8-13'
_space_group_crystal_system      triclinic
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_atom_sites_solution_hydrogens   mixed
_cell_angle_alpha                85.311(3)
_cell_angle_beta                 81.831(3)
_cell_angle_gamma                67.988(3)
_cell_formula_units_Z            2
_cell_length_a                   7.0888(3)
_cell_length_b                   8.1527(3)
_cell_length_c                   18.2143(8)
_cell_measurement_reflns_used    6911
_cell_measurement_temperature    100.(2)
_cell_measurement_theta_max      26.0951
_cell_measurement_theta_min      2.2603
_cell_volume                     965.56(7)
_computing_cell_refinement       'SAINT V8.34A (Bruker AXS Inc., 2013)'
_computing_data_collection       'Bruker Instrument Service v2014.5.0.0'
_computing_data_reduction        'SAINT V8.34A (Bruker AXS Inc., 2013)'
_computing_molecular_graphics    'shelXle (C.B. Huebschle, rev 807)'
_computing_structure_refinement  'SHELXL-2017/1 (Sheldrick, 2017)'
_diffrn_ambient_temperature      100.(2)
_diffrn_detector_area_resol_mean 8.3333
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_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  0.0406
_diffrn_reflns_av_unetI/netI     0.0252
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       22
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            26472
_diffrn_reflns_theta_full        26.18
_diffrn_reflns_theta_max         26.18
_diffrn_reflns_theta_min         1.13
_exptl_absorpt_coefficient_mu    0.145
_exptl_absorpt_correction_T_max  0.99
_exptl_absorpt_correction_T_min  0.96
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS V2014/3 (Bruker AXS Inc.)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.219
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             384
_exptl_crystal_size_max          0.175
_exptl_crystal_size_mid          0.107
_exptl_crystal_size_min          0.058
_refine_diff_density_max         0.342
_refine_diff_density_min         -0.246
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.089
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     221
_refine_ls_number_reflns         3864
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.089
_refine_ls_R_factor_all          0.0490
_refine_ls_R_factor_gt           0.0383
_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^)+(0.0545P)^2^+0.4674P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1023
_refine_ls_wR_factor_ref         0.1085
_reflns_number_gt                3215
_reflns_number_total             3864
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jo8b01322_si_003.cif
_cod_data_source_block           7b
_cod_database_code               4035145
_shelx_res_checksum              14453
_shelx_hkl_checksum              21380