Synthesis of tetrasubstituted thiophenes via a [3+2] cascade cyclization reaction of pyridinium 1,4-zwitterionic thiolates and activated allenes.
Zhai, Shengxian; Zhang, Xinping; Cheng, Bin; Li, Hui; Li, Yuntong; He, Yixuan; Li, Yun; Wang, Taimin; Zhai, Hongbin; Chemical communications (Cambridge, England) 56 (2020) 3085–3088; doi:10.1039/d0cc00262c

data_7125949
_publ_section_title
;
 Synthesis of tetrasubstituted thiophenes via a [3+2] cascade cyclization
 reaction of pyridinium 1,4-zwitterionic thiolates and activated allenes.
;
_journal_issue                   20
_journal_name_full
'Chemical communications (Cambridge, England)'
_journal_page_first              3085
_journal_page_last               3088
_journal_paper_doi               10.1039/d0cc00262c
_journal_volume                  56
_journal_year                    2020
_chemical_formula_iupac          'C8 H9 N O'
_chemical_formula_moiety         'C8 H9 N O'
_chemical_formula_sum            'C8 H9 N O'
_chemical_formula_weight         135.16
_chemical_name_systematic
;
<i>N</i>-(4-Methylphenyl)formamide
;
_space_group_IT_number           2
_space_group_name_Hall           '-P 1'
_space_group_name_H-M_alt        'P -1'
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_block_doi                 10.5517/ccys41w
_audit_creation_method           SHELXL-97
_audit_update_record
;
2012-06-14 deposited with the CCDC.	2020-02-05 downloaded from the CCDC.
;
_cell_angle_alpha                93.7300(10)
_cell_angle_beta                 102.7800(10)
_cell_angle_gamma                91.7690(10)
_cell_formula_units_Z            2
_cell_length_a                   6.5511(11)
_cell_length_b                   6.9192(12)
_cell_length_c                   8.0265(17)
_cell_measurement_reflns_used    1570
_cell_measurement_temperature    153(2)
_cell_measurement_theta_max      27.51
_cell_measurement_theta_min      3.64
_cell_volume                     353.68(11)
_computing_cell_refinement       '<i>CrystalClear</i> (Rigaku, 2005)'
_computing_data_collection       '<i>CrystalClear</i> (Rigaku, 2005)'
_computing_data_reduction        '<i>CrystalClear</i> (Rigaku, 2005)'
_computing_molecular_graphics    '<i>SHELXTL</i> (Sheldrick, 2008)'
_computing_publication_material  '<i>SHELXTL</i> (Sheldrick, 2008)'
_computing_structure_refinement  '<i>SHELXL97</i> (Sheldrick, 2008)'
_computing_structure_solution    '<i>SHELXS97</i> (Sheldrick, 2008)'
_diffrn_ambient_temperature      153(2)
_diffrn_detector_area_resol_mean 13.6612
_diffrn_measured_fraction_theta_full 0.961
_diffrn_measured_fraction_theta_max 0.961
_diffrn_measurement_device_type  'Rigaku Mercury2'
_diffrn_measurement_method       'CCD profile fitting'
_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  0.0296
_diffrn_reflns_av_sigmaI/netI    0.0707
_diffrn_reflns_limit_h_max       8
_diffrn_reflns_limit_h_min       -8
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            2597
_diffrn_reflns_theta_full        27.51
_diffrn_reflns_theta_max         27.51
_diffrn_reflns_theta_min         3.64
_exptl_absorpt_coefficient_mu    0.085
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.910
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(CrystalClear; Rigaku, 2005)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.269
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             144
_exptl_crystal_size_max          0.10
_exptl_crystal_size_mid          0.05
_exptl_crystal_size_min          0.05
_refine_diff_density_max         0.240
_refine_diff_density_min         -0.210
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.902
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     92
_refine_ls_number_reflns         1570
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.902
_refine_ls_R_factor_all          0.0713
_refine_ls_R_factor_gt           0.0464
_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^)+(0.0693P)^2^] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1189
_refine_ls_wR_factor_ref         0.1273
_reflns_number_gt                943
_reflns_number_total             1570
_reflns_threshold_expression     I>2sigma(I)
_cod_data_source_file            d0cc00262c2.cif
_cod_data_source_block           I
_cod_depositor_comments
'Adding full bibliography for 7125949--7125950.cif.'
_cod_database_code               7125949