Diels‒Alder reactions of 3,6-disubstituted 1,2,4,5-tetrazines. Synthesis and X-ray crystal structures of diazafluoranthene derivatives
Rahanyan, Nelli; Linden, Anthony; Baldridge, Kim K.; Siegel, Jay S.; Organic & Biomolecular Chemistry 7 (2009) 2082–2092; doi:10.1039/b820551e

data_7150613
_publ_section_title
;
 Diels--Alder reactions of 3,6-disubstituted 1,2,4,5-tetrazines.
 Synthesis and X-ray crystal structures of diazafluoranthene
 derivatives
;
_journal_issue                   10
_journal_name_full               'Organic &amp; Biomolecular Chemistry'
_journal_page_first              2082
_journal_page_last               2092
_journal_paper_doi               10.1039/b820551e
_journal_volume                  7
_journal_year                    2009
_chemical_formula_moiety         'C12 H6 Br2'
_chemical_formula_sum            'C12 H6 Br2'
_chemical_formula_weight         309.99
_chemical_name_systematic
;
?
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_date             06-09-07
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 105.7697(13)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   7.8327(2)
_cell_length_b                   19.1058(4)
_cell_length_c                   6.8699(2)
_cell_measurement_reflns_used    11983
_cell_measurement_temperature    160(1)
_cell_measurement_theta_max      30.0
_cell_measurement_theta_min      2.0
_cell_volume                     989.39(4)
_computing_cell_refinement       'DENZO-SMN (Otwinowski & Minor, 1997)'
_computing_data_collection       'COLLECT (Nonius, 2000)'
_computing_data_reduction
'DENZO-SMN and SCALEPACK (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'ORTEPII (Johnson, 1976)'
_computing_publication_material  'SHELXL97 and PLATON (Spek, 2006)'
_computing_structure_refinement  'SHELXL97 (Sheldrick, 1997)'
_computing_structure_solution    'SIR92 (Altomare et al., 1994)'
_diffrn_ambient_temperature      160(1)
_diffrn_detector                 '65 mm CCD camera on \k goniostat'
_diffrn_detector_area_resol_mean 9
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type
'Nonius KappaCCD area-detector diffractometer'
_diffrn_measurement_method       '\f and \w scans with \k offsets'
_diffrn_radiation_monochromator  'horizontally mounted graphite crystal'
_diffrn_radiation_source         'Nonius FR590 sealed tube generator'
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0840
_diffrn_reflns_av_sigmaI/netI    0.0369
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       26
_diffrn_reflns_limit_k_min       -26
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            22044
_diffrn_reflns_theta_full        30.03
_diffrn_reflns_theta_max         30.03
_diffrn_reflns_theta_min         2.13
_diffrn_standards_decay_%        0
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    8.167
_exptl_absorpt_correction_T_max  0.394
_exptl_absorpt_correction_T_min  0.189
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   '(Blessing, 1995)'
_exptl_crystal_colour            'pale yellow'
_exptl_crystal_density_diffrn    2.081
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       tablet
_exptl_crystal_F_000             592
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.25
_exptl_crystal_size_min          0.12
_refine_diff_density_max         0.887
_refine_diff_density_min         -0.760
_refine_diff_density_rms         0.190
_refine_ls_extinction_coef       0.0182(13)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.086
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     128
_refine_ls_number_reflns         2893
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.086
_refine_ls_R_factor_all          0.0542
_refine_ls_R_factor_gt           0.0402
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0567P)^2^+0.3292P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0937
_refine_ls_wR_factor_ref         0.1004
_reflns_number_gt                2315
_reflns_number_total             2893
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            b820551e.txt
_cod_data_source_block           SG0630
_cod_database_code               7150613