Fluoride-Assisted Synthesis of 1,4,5,6-Tetrahydropyridazines via [4 + 2] Cyclodimerization of in Situ-Generated Azoalkenes Followed by a C-N Bond Cleavage.
Shelke, Anil M.; Suryavanshi, Gurunath; Organic letters 18 (2016) 3968–3971; doi:10.1021/acs.orglett.6b01551

data_1555603
_publ_section_title
;
 Fluoride-Assisted Synthesis of 1,4,5,6-Tetrahydropyridazines via [4 + 2]
 Cyclodimerization of in Situ-Generated Azoalkenes Followed by a C-N Bond
 Cleavage.
;
_journal_issue                   16
_journal_name_full               'Organic letters'
_journal_page_first              3968
_journal_page_last               3971
_journal_paper_doi               10.1021/acs.orglett.6b01551
_journal_volume                  18
_journal_year                    2016
_chemical_formula_moiety         'C20 H16 N4 O2'
_chemical_formula_sum            'C20 H16 N4 O2'
_chemical_formula_weight         344.37
_space_group_IT_number           14
_space_group_name_Hall           '-P 2ybc'
_space_group_name_H-M_alt        'P 1 21/c 1'
_symmetry_cell_setting           monoclinic
_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_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 106.723(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   6.1927(7)
_cell_length_b                   35.576(4)
_cell_length_c                   8.3860(9)
_cell_measurement_reflns_used    3097
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      22.91
_cell_measurement_theta_min      2.29
_cell_volume                     1769.4(3)
_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-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 2008)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_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  0.0429
_diffrn_reflns_av_sigmaI/netI    0.0313
_diffrn_reflns_limit_h_max       7
_diffrn_reflns_limit_h_min       -7
_diffrn_reflns_limit_k_max       42
_diffrn_reflns_limit_k_min       -42
_diffrn_reflns_limit_l_max       9
_diffrn_reflns_limit_l_min       -9
_diffrn_reflns_number            16556
_diffrn_reflns_theta_full        25.00
_diffrn_reflns_theta_max         25.00
_diffrn_reflns_theta_min         2.29
_exptl_absorpt_coefficient_mu    0.087
_exptl_absorpt_correction_T_max  0.9820
_exptl_absorpt_correction_T_min  0.9703
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs,(bruker,2006)
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.293
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             720
_exptl_crystal_size_max          0.35
_exptl_crystal_size_mid          0.29
_exptl_crystal_size_min          0.21
_refine_diff_density_max         0.776
_refine_diff_density_min         -0.454
_refine_diff_density_rms         0.059
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.099
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     236
_refine_ls_number_reflns         3114
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.099
_refine_ls_R_factor_all          0.1045
_refine_ls_R_factor_gt           0.0813
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1137P)^2^+1.3454P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.2228
_refine_ls_wR_factor_ref         0.2400
_reflns_number_gt                2348
_reflns_number_total             3114
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ol6b01551_si_002.cif
_cod_data_source_block           anilsh
_cod_depositor_comments
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The following automatic conversions were performed:

data item '_symmetry_cell_setting' value 'Monoclinic' was changed to
'monoclinic' in accordance with the
/home/saulius/struct/COD-crude-data/automatic-downloads/DataCite-retrospective/ACS/depositions/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 last updated on
2011-04-26.

Automatic conversion script
Id: cif_fix_values 6909 2019-04-08 15:41:33Z antanas 
;
_cod_original_sg_symbol_H-M      'P2(1)/c  '
_cod_database_code               1555603