Zn(OTf)(2)-catalyzed addition of amines to carbodiimides: efficient synthesis of guanidines and unpredicted formation of Zn-N amido species.
Li, Dongzhen; Guang, Jie; Zhang, Wen-Xiong; Wang, Yang; Xi, Zhenfeng; Organic & biomolecular chemistry 8 (2010) 1816–1820; doi:10.1039/b923249b

data_7153293
_publ_section_title
;
 Zn(OTf)(2)-catalyzed addition of amines to carbodiimides: efficient
 synthesis of guanidines and unpredicted formation of Zn-N amido species.
;
_journal_issue                   8
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              1816
_journal_page_last               1820
_journal_paper_doi               10.1039/b923249b
_journal_volume                  8
_journal_year                    2010
_chemical_formula_moiety         'C16 H28 N3, C F3 O3 S'
_chemical_formula_sum            'C17 H28 F3 N3 O3 S'
_chemical_formula_weight         411.48
_chemical_name_systematic
;
?
;
_space_group_IT_number           33
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2c -2n'
_symmetry_space_group_name_H-M   'P n a 21'
_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                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   16.419(3)
_cell_length_b                   12.458(3)
_cell_length_c                   10.520(2)
_cell_measurement_reflns_used    573
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      27.48
_cell_measurement_theta_min      2.17
_cell_volume                     2151.8(8)
_computing_cell_refinement       'CrystalClear (Rigaku Inc., 2008)'
_computing_data_collection       'CrystalClear (Rigaku Inc., 2008)'
_computing_data_reduction        'CrystalClear (Rigaku Inc., 2008)'
_computing_molecular_graphics    'XP in Siemens SHELXTL (Sheldrick, 1994)'
_computing_publication_material  'SHELX97 (Sheldrick, 1997)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Saturn724+ CCD'
_diffrn_measurement_method       '\w scans at fixed \c = 45\%'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0369
_diffrn_reflns_av_sigmaI/netI    0.0322
_diffrn_reflns_limit_h_max       21
_diffrn_reflns_limit_h_min       -14
_diffrn_reflns_limit_k_max       16
_diffrn_reflns_limit_k_min       -16
_diffrn_reflns_limit_l_max       12
_diffrn_reflns_limit_l_min       -13
_diffrn_reflns_number            16883
_diffrn_reflns_theta_full        27.49
_diffrn_reflns_theta_max         27.49
_diffrn_reflns_theta_min         2.82
_exptl_absorpt_coefficient_mu    0.196
_exptl_absorpt_correction_T_max  0.9749
_exptl_absorpt_correction_T_min  0.9435
_exptl_absorpt_correction_type   numerical
_exptl_absorpt_process_details   'CrystalClear (Rigaku Inc., 2008)'
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.270
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             872
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.29
_exptl_crystal_size_min          0.13
_refine_diff_density_max         0.185
_refine_diff_density_min         -0.200
_refine_diff_density_rms         0.037
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.00(8)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.082
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     244
_refine_ls_number_reflns         4604
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.082
_refine_ls_R_factor_all          0.0482
_refine_ls_R_factor_gt           0.0441
_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^)+(0.0375P)^2^+0.6163P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0945
_refine_ls_wR_factor_ref         0.0977
_reflns_number_gt                4315
_reflns_number_total             4604
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            b923249b.txt
_cod_data_source_block           22
_cod_original_cell_volume        2151.8(7)
_cod_original_sg_symbol_H-M      Pna2(1)
_cod_database_code               7153293