Ring-fused hexahydro-1,2,4,5-tetrazines: synthesis, structure, and mechanistic studies on isolable rotational isomers.
Toda, Yasunori; Kooguchi, Airi; Sukegawa, Kimiya; Kikuchi, Ayaka; Suga, Hiroyuki; Chemical communications (Cambridge, England) 59 (2023) 700–703; doi:10.1039/d2cc06170h

data_7131088
_publ_section_title
;
 Ring-fused hexahydro-1,2,4,5-tetrazines: synthesis, structure, and
 mechanistic studies on isolable rotational isomers.
;
_journal_issue                   6
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              700
_journal_page_last               703
_journal_paper_doi               10.1039/d2cc06170h
_journal_volume                  59
_journal_year                    2023
_chemical_formula_sum            'C22 H24 N4 O2'
_chemical_formula_weight         376.45
_space_group_crystal_system      orthorhombic
_space_group_IT_number           33
_space_group_name_Hall           'P 2c -2n'
_space_group_name_H-M_alt        'P n a 21'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_update_record
;
2022-11-01 deposited with the CCDC.	2022-12-12 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 90
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   18.660(2)
_cell_length_b                   13.2963(15)
_cell_length_c                   7.8585(9)
_cell_measurement_reflns_used    228
_cell_measurement_temperature    296.(2)
_cell_measurement_theta_max      22.3726
_cell_measurement_theta_min      3.3487
_cell_volume                     1949.8(4)
_computing_cell_refinement       'APEX2 v2010.11-3 (Bruker AXS)'
_computing_data_collection       'Bruker Instrument Service v2010.11.0.0'
_computing_data_reduction        'SAINT V7.68A (Bruker AXS, 2009)'
_computing_molecular_graphics    'XSHELL V6.3.1 (Bruker AXS)'
_computing_publication_material  'Generate Report (Bruker AXS)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      296.(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 D8 goniometer'
_diffrn_measurement_method       'omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0237
_diffrn_reflns_av_sigmaI/netI    0.0278
_diffrn_reflns_limit_h_max       22
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       15
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -8
_diffrn_reflns_number            8906
_diffrn_reflns_theta_full        25.08
_diffrn_reflns_theta_max         25.08
_diffrn_reflns_theta_min         1.88
_diffrn_source                   'sealed tube'
_exptl_absorpt_coefficient_mu    0.084
_exptl_absorpt_correction_T_max  0.97
_exptl_absorpt_correction_T_min  0.79
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS V2008/1 (Bruker AXS)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.282
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             800
_exptl_crystal_size_max          0.850
_exptl_crystal_size_mid          0.390
_exptl_crystal_size_min          0.320
_refine_diff_density_max         0.145
_refine_diff_density_min         -0.192
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   2.5(17)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.253
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     255
_refine_ls_number_reflns         3305
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.253
_refine_ls_R_factor_all          0.0561
_refine_ls_R_factor_gt           0.0418
_refine_ls_shift/su_max          0.009
_refine_ls_shift/su_mean         0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0540P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1046
_refine_ls_wR_factor_ref         0.1136
_reflns_number_gt                2686
_reflns_number_total             3305
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            d2cc06170h2.cif
_cod_data_source_block           I_CCDC1
_cod_depositor_comments
'Adding full bibliography for 7131087--7131090.cif.'
_cod_database_code               7131088