1,3-Bis(N,N-dialkylamino)imidazolin-2-ylidenes: Synthesis and Reactivity of a New Family of Stable N-Heterocyclic Carbenes
Manuel Alcarazo; Stephen J. Roseblade; Emma Alonso; Rosario Fernández; Eleuterio Alvarez; Fernando J. Lahoz; José M. Lassaletta; Journal of the American Chemical Society 126 (2004) 13242–13243; doi:10.1021/ja0471119

data_4113063
_publ_contact_author_address
;
  Dr. Jose M. Lassaletta
 Instituto de Investigaciones Quimicas, C.S.I.C-Universidad de Sevilla,
 Avd. Americo Vespucio, s/n., Isla de la Cartuja, 41092 Sevilla,  Spain
;
_publ_contact_author_email       jmlassa@iiq.csic.es
_publ_contact_author_fax         '+34 954 460565'
_publ_contact_author_name        'Dr. Jose M. Lassaletta'
_publ_contact_author_phone       '+34 954 489560'
_publ_section_title
;
 1,3-Bis(N,N-dialkylamino)imidazolin-2-ylidenes: Synthesis and Reactivity
 of a New Family of Stable N-Heterocyclic Carbenes
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              13242
_journal_page_last               13243
_journal_paper_doi               10.1021/ja0471119
_journal_volume                  126
_journal_year                    2004
_chemical_absolute_configuration rmad
_chemical_formula_moiety         'C23 H40 Cl N4 Rh'
_chemical_formula_sum            'C23 H40 Cl N4 Rh'
_chemical_formula_weight         510.95
_space_group_IT_number           19
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  'P 2ac 2ab'
_symmetry_space_group_name_H-M   'P 21 21 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            8
_cell_length_a                   13.2635(10)
_cell_length_b                   17.8218(14)
_cell_length_c                   21.0178(17)
_cell_measurement_reflns_used    17385
_cell_measurement_temperature    295(2)
_cell_measurement_theta_max      26.978
_cell_measurement_theta_min      2.250
_cell_volume                     4968.2(7)
_computing_cell_refinement       'SAINT+ v. 6.22 (Bruker AXS, 2001)'
_computing_data_collection       'SMART v. 5.625 (Bruker AXS, 2001)'
_computing_data_reduction        'SAINT+ v. 6.22 (Bruker AXS, 2001)'
_computing_molecular_graphics    'XP, SHELXTL v. 6.10 (Bruker, 2000)'
_computing_publication_material  'XCIF, SHELXTL v. 6.10 (Bruker, 2000)'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      295(2)
_diffrn_detector_area_resol_mean 8.26
_diffrn_measured_fraction_theta_full 0.981
_diffrn_measured_fraction_theta_max 0.981
_diffrn_measurement_device_type  'Bruker SMART APEX CCD system'
_diffrn_measurement_method       '\w rotations with narrow frames'
_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  0.0266
_diffrn_reflns_av_sigmaI/netI    0.0227
_diffrn_reflns_limit_h_max       17
_diffrn_reflns_limit_h_min       -17
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       27
_diffrn_reflns_limit_l_min       -27
_diffrn_reflns_number            61546
_diffrn_reflns_theta_full        28.39
_diffrn_reflns_theta_max         28.39
_diffrn_reflns_theta_min         1.50
_diffrn_standards_number         'no decay'
_exptl_absorpt_coefficient_mu    0.811
_exptl_absorpt_correction_T_max  0.8942
_exptl_absorpt_correction_T_min  0.6998
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
; SADABS: Area-Detector Absorption Correction. Bruker-AXS 
  within SAINT+ package, v. 6.22 (2001).
;
_exptl_crystal_colour            yellow
_exptl_crystal_density_diffrn    1.366
_exptl_crystal_description       prism
_exptl_crystal_F_000             2144
_exptl_crystal_size_max          0.474
_exptl_crystal_size_mid          0.291
_exptl_crystal_size_min          0.141
_refine_diff_density_max         0.371
_refine_diff_density_min         -0.222
_refine_diff_density_rms         0.051
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   -0.03(3)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.023
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     537
_refine_ls_number_reflns         12005
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.023
_refine_ls_R_factor_all          0.0434
_refine_ls_R_factor_gt           0.0308
_refine_ls_shift/su_max          0.025
_refine_ls_shift/su_mean         0.002
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0441P)^2^+0.7238P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0762
_refine_ls_wR_factor_ref         0.0825
_reflns_number_gt                9734
_reflns_number_total             12005
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja0471119si20040908_102737_3.cif
_cod_data_source_block           8
_cod_database_code               4113063