The reaction of β-lactam carbenes with 3,6-dipyridyltetrazines: switch of reaction pathways by 2-pyridyl and 4-pyridyl substituents of tetrazines.
Wang, Xiao-Rong; Xing, Juan; Yan, Cai-Xia; Cheng, Ying; Organic & biomolecular chemistry 10 (2012) 970–977; doi:10.1039/c1ob06595e

data_7152182
_publ_section_title
;
 The reaction of \b-lactam carbenes with 3,6-dipyridyltetrazines: switch
 of reaction pathways by 2-pyridyl and 4-pyridyl substituents of
 tetrazines.
;
_journal_issue                   5
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              970
_journal_page_last               977
_journal_paper_doi               10.1039/c1ob06595e
_journal_volume                  10
_journal_year                    2012
_chemical_formula_moiety         'C40.50 H44 N4 O4.50'
_chemical_formula_sum            'C40.5 H44 N4 O4.5'
_chemical_formula_weight         658.80
_space_group_IT_number           2
_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_creation_method           SHELXL-97
_cell_angle_alpha                96.802(8)
_cell_angle_beta                 93.368(2)
_cell_angle_gamma                119.634(9)
_cell_formula_units_Z            2
_cell_length_a                   11.7220(17)
_cell_length_b                   11.8090(18)
_cell_length_c                   14.7910(18)
_cell_measurement_reflns_used    5968
_cell_measurement_temperature    113(2)
_cell_measurement_theta_max      28.00
_cell_measurement_theta_min      1.40
_cell_volume                     1750.7(5)
_computing_cell_refinement       'CrystalClear-SM Expert 2.0 r2'
_computing_data_collection       'CrystalClear-SM Expert 2.0 r2 (Rigaku, 2009)'
_computing_data_reduction        'CrystalClear-SM Expert 2.0 r2'
_computing_molecular_graphics    'CrystalStructure 4.0'
_computing_publication_material  'CrystalStructure 4.0 (Rigaku, 2009)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      113(2)
_diffrn_measured_fraction_theta_full 0.987
_diffrn_measured_fraction_theta_max 0.987
_diffrn_measurement_device_type  'Rigaku Saturn724 CCD camera'
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  multilayer
_diffrn_radiation_source         'rotating anode'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71075
_diffrn_reflns_av_R_equivalents  0.0384
_diffrn_reflns_av_sigmaI/netI    0.0694
_diffrn_reflns_limit_h_max       15
_diffrn_reflns_limit_h_min       -15
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       19
_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            22069
_diffrn_reflns_theta_full        27.91
_diffrn_reflns_theta_max         27.91
_diffrn_reflns_theta_min         2.01
_exptl_absorpt_coefficient_mu    0.082
_exptl_absorpt_correction_T_max  0.9854
_exptl_absorpt_correction_T_min  0.9742
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   CrystalClear
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.250
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             702
_exptl_crystal_size_max          0.32
_exptl_crystal_size_mid          0.22
_exptl_crystal_size_min          0.18
_refine_diff_density_max         0.414
_refine_diff_density_min         -0.233
_refine_diff_density_rms         0.050
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.045
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     459
_refine_ls_number_reflns         8303
_refine_ls_number_restraints     13
_refine_ls_restrained_S_all      1.060
_refine_ls_R_factor_all          0.0748
_refine_ls_R_factor_gt           0.0523
_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^)+(0.0833P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1545
_refine_ls_wR_factor_ref         0.1633
_reflns_number_gt                4625
_reflns_number_total             8303
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c1ob06595e.txt
_cod_data_source_block           shelxl2
_cod_original_cell_volume        1750.7(4)
_cod_original_formula_sum        'C40.50 H44 N4 O4.50'
_cod_database_code               7152182