Rapid Access to Substituted Piperazines via Ti(NMe2)4-Mediated C–C Bond-Making Reactions
Chen, Zhou; Wu, Jian; Chen, Yanmei; Li, Lei; Xia, Yuanzhi; Li, Yahong; Liu, Wei; Lei, Tao; Yang, Lijuan; Gao, Dandan; Li, Wu; Organometallics 31 (2012) 6005–; doi:10.1021/om300022u

data_4078979
_publ_section_title
;
 Rapid Access to Substituted Piperazines via Ti(NMe2)4-Mediated C--C
 Bond-Making Reactions
;
_journal_issue                   17
_journal_name_full               Organometallics
_journal_page_first              6005
_journal_paper_doi               10.1021/om300022u
_journal_volume                  31
_journal_year                    2012
_chemical_formula_moiety         'C24 H20 N4 O2 Ti, C4 H8 O'
_chemical_formula_sum            'C28 H28 N4 O3 Ti'
_chemical_formula_weight         516.44
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_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_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 93.94(3)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   11.623(2)
_cell_length_b                   18.586(4)
_cell_length_c                   11.286(2)
_cell_measurement_temperature    293(2)
_cell_volume                     2432.3(8)
_computing_cell_refinement       'Bruker FRAMBO'
_computing_data_collection       'Bruker FRAMBO'
_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      293(2)
_diffrn_measured_fraction_theta_full 0.996
_diffrn_measured_fraction_theta_max 0.996
_diffrn_measurement_device_type  'multiwire proportional'
_diffrn_measurement_method       'phi and omega 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  0.0455
_diffrn_reflns_av_sigmaI/netI    0.0509
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       20
_diffrn_reflns_limit_k_min       -21
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            14401
_diffrn_reflns_theta_full        24.28
_diffrn_reflns_theta_max         24.28
_diffrn_reflns_theta_min         2.07
_exptl_absorpt_coefficient_mu    0.391
_exptl_absorpt_correction_T_max  0.9620
_exptl_absorpt_correction_T_min  0.9260
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   sadabs
_exptl_crystal_colour            violet
_exptl_crystal_density_diffrn    1.410
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             1080
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.14
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.414
_refine_diff_density_min         -0.338
_refine_diff_density_rms         0.061
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.042
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     325
_refine_ls_number_reflns         3923
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.060
_refine_ls_R_factor_all          0.0833
_refine_ls_R_factor_gt           0.0512
_refine_ls_shift/su_max          0.015
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0780P)^2^+2.1226P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1365
_refine_ls_wR_factor_ref         0.1568
_reflns_number_gt                2780
_reflns_number_total             3923
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            om300022u_si_003.cif
_cod_data_source_block           3
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4078979