Tetracyclic silaheterocycle formed through a pericyclic reaction cascade including a two-fold intramolecular C–C bond activation
Lips, Felicitas; Helmer, Joschua; Pakkanen, Olli J.; Gendy, Chris; Hepp, Alexander; Tuononen, Heikki M.; Chemical Communications  (2022) –; doi:10.1039/D2CC00298A

data_7129677
_publ_section_title
;
 Tetracyclic silaheterocycle formed through a pericyclic reaction cascade
 including a two-fold intramolecular C--C bond activation
;
_journal_name_full               'Chemical Communications'
_journal_paper_doi               10.1039/D2CC00298A
_journal_year                    2022
_chemical_formula_sum            'C42 H60 Br2 N2 Si4'
_chemical_formula_weight         865.10
_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-2016/6
_audit_update_record
;
2021-10-26 deposited with the CCDC.	2022-02-07 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 93.700(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   18.4502(16)
_cell_length_b                   8.4359(7)
_cell_length_c                   27.821(2)
_cell_measurement_reflns_used    9886
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      27.13
_cell_measurement_theta_min      2.21
_cell_volume                     4321.1(6)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-2016/6 (Sheldrick, 2016)'
_computing_structure_solution    'SHELXT 2014/5 (Sheldrick, 2014)'
_diffrn_ambient_temperature      100(2)
_diffrn_measured_fraction_theta_full 0.994
_diffrn_measured_fraction_theta_max 0.993
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0373
_diffrn_reflns_av_unetI/netI     0.0345
_diffrn_reflns_Laue_measured_fraction_full 0.994
_diffrn_reflns_Laue_measured_fraction_max 0.993
_diffrn_reflns_limit_h_max       23
_diffrn_reflns_limit_h_min       -23
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -10
_diffrn_reflns_limit_l_max       35
_diffrn_reflns_limit_l_min       -35
_diffrn_reflns_number            34664
_diffrn_reflns_point_group_measured_fraction_full 0.994
_diffrn_reflns_point_group_measured_fraction_max 0.993
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         27.141
_diffrn_reflns_theta_min         1.893
_exptl_absorpt_coefficient_mu    2.018
_exptl_absorpt_correction_T_max  0.7455
_exptl_absorpt_correction_T_min  0.5155
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   SADABS
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.330
_exptl_crystal_description       plate
_exptl_crystal_F_000             1808
_exptl_crystal_size_max          0.681
_exptl_crystal_size_mid          0.427
_exptl_crystal_size_min          0.159
_refine_diff_density_max         1.073
_refine_diff_density_min         -0.563
_refine_diff_density_rms         0.094
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.227
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     463
_refine_ls_number_reflns         9488
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.227
_refine_ls_R_factor_all          0.0519
_refine_ls_R_factor_gt           0.0440
_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^)+(0.0222P)^2^+9.1407P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0954
_refine_ls_wR_factor_ref         0.0983
_reflns_Friedel_coverage         0.000
_reflns_number_gt                8399
_reflns_number_total             9488
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            d2cc00298a3.cif
_cod_data_source_block           fl190817m1_a
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               7129677
_shelx_shelxl_version_number     2016/6
_shelx_res_checksum              95217