Isolation and structural characterization of a titanacyclopropane as key intermediate in the double aryl Grignard addition to 2-(arylethynyl)pyridine derivatives.
Foschi, Francesco; Roth, Torsten; Enders, Markus; Wadepohl, Hubert; Clot, Eric; Gade, Lutz H.; Chemical communications (Cambridge, England) 54 (2018) 2228–2231; doi:10.1039/c8cc00478a

data_7121240
_publ_section_title
;
 Isolation and structural characterization of a titanacyclopropane as key
 intermediate in the double aryl Grignard addition to
 2-(arylethynyl)pyridine derivatives.
;
_journal_issue                   18
_journal_name_full               'Chemical communications (Cambridge, England)'
_journal_page_first              2228
_journal_page_last               2231
_journal_paper_doi               10.1039/c8cc00478a
_journal_volume                  54
_journal_year                    2018
_chemical_absolute_configuration unk
_chemical_formula_moiety         'C25 H19 N'
_chemical_formula_sum            'C25 H19 N'
_chemical_formula_weight         333.41
_space_group_crystal_system      monoclinic
_space_group_IT_number           4
_space_group_name_Hall           'P 2yb'
_space_group_name_H-M_alt        'P 1 21 1'
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 1'
_atom_sites_solution_hydrogens   mixed
_atom_sites_solution_primary     iterative
_atom_sites_solution_secondary   difmap
_audit_block_code                ga_tro129
_audit_creation_date             2018-01-15
_audit_creation_method
;
Olex2 1.2
(compiled Aug 10 2017 17:44:14 for OlexSys, GUI svn.r5381)
;
_audit_update_record
;
2018-01-17 deposited with the CCDC.
2018-02-05 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 107.030(14)
_cell_angle_gamma                90
_cell_formula_units_Z            2
_cell_length_a                   9.652(5)
_cell_length_b                   9.262(4)
_cell_length_c                   10.579(5)
_cell_measurement_reflns_used    6018
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      31.19
_cell_measurement_theta_min      2.51
_cell_volume                     904.3(7)
_computing_cell_refinement
;
SAINT (see _computing_data_reduction). Includes estimated systematic errors
 of the unit cell constants from Monte Carlo simulations.
;
_computing_data_collection       'SMART-5.631 (Bruker AXS, 2003)'
_computing_data_reduction
'SAINT V8.34A (Bruker AXS, 1997-2013),SADABS-2014_5 (Sheldrick and Bruker AXS, 1997-2014)'
_computing_molecular_graphics    'Olex2 (Dolomanov et al., 2009)'
_computing_publication_material
'encif (Wadepohl, 2009-17); encifer 1.5.2 (CCDC, 2016)'
_computing_structure_refinement  'ShelXL (Sheldrick, 2015)'
_computing_structure_solution    'SUPERFLIP (Palatinus, 2007-2009)'
_diffrn_ambient_environment      'perfluoro polyether oil / N~2~'
_diffrn_ambient_temperature      100(1)
_diffrn_detector                 'CCD plate'
_diffrn_detector_area_resol_mean 8.19
_diffrn_detector_type            CCD-PXL-KAF2
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device       'three-circle diffractometer'
_diffrn_measurement_device_type  'Bruker AXS Smart 1000'
_diffrn_measurement_method       '\f- and \w-scans'
_diffrn_measurement_specimen_support 'polyimid foil'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_probe          x-ray
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0434
_diffrn_reflns_av_unetI/netI     0.0447
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 1.000
_diffrn_reflns_limit_h_max       13
_diffrn_reflns_limit_h_min       -13
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       14
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            21932
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.997
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         30.504
_diffrn_reflns_theta_min         2.013
_diffrn_source                   'sealed X-Ray tube (Mo)'
_diffrn_source_type              'fine focus tube'
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.071
_exptl_absorpt_correction_T_max  0.8623
_exptl_absorpt_correction_T_min  0.8055
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
multi-scan from symmetry-related measurements (Blessing 1995)
SADABS (see _computing_data_reduction)
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.225
_exptl_crystal_description       irregular
_exptl_crystal_F_000             352
_exptl_crystal_size_max          0.250
_exptl_crystal_size_mid          0.220
_exptl_crystal_size_min          0.150
_refine_diff_density_max         0.253
_refine_diff_density_min         -0.211
_refine_diff_density_rms         0.039
_refine_ls_abs_structure_details
;
 Flack x determined using 1701 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   0.0(10)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.048
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     320
_refine_ls_number_reflns         5499
_refine_ls_number_restraints     86
_refine_ls_restrained_S_all      1.049
_refine_ls_R_factor_all          0.0608
_refine_ls_R_factor_gt           0.0449
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0421P)^2^+0.1187P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0937
_refine_ls_wR_factor_ref         0.1009
_reflns_Friedel_coverage         0.887
_reflns_Friedel_fraction_full    0.999
_reflns_Friedel_fraction_max     0.994
_reflns_number_gt                4474
_reflns_number_total             5499
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            c8cc00478a2.cif
_cod_data_source_block           ga_tro129
_cod_depositor_comments
'Adding full bibliography for 7121234--7121240.cif.'
_cod_original_cell_volume        904.2(7)
_cod_database_code               7121240
_audit_block_refno               2398
_audit_block_usercomment         tr1493_3
_shelx_estimated_absorpt_t_max   0.989
_shelx_estimated_absorpt_t_min   0.983
_shelxl_version_number           2018/1
_olex2_refinement_description
;
1. Fixed Uiso
 At 1.2 times of:
  All C(H) groups
2. Restrained distances
 C1-C3A \\sim C1-C3B
 with sigma of 0.01
3. Uiso/Uaniso restraints and constraints
C1 \\sim C2 \\sim C9 \\sim C10 \\sim C11 \\sim C12 \\sim C13 \\sim C14 \\sim
C15 \\sim C16 \\sim C17 \\sim C18 \\sim C19 \\sim C20 \\sim C21 \\sim C22 \\sim
C23 \\sim C24 \\sim C25 \\sim C26 \\sim C3A \\sim C5A \\sim C6A \\sim C7A \\sim
C8A \\sim C3B \\sim C4B \\sim C5B \\sim C6B \\sim C7B \\sim N4B \\sim N8B:
within 0.5A with sigma of 0.01 and sigma for terminal atoms of 0.01
Uanis(C3A) = Uanis(C3B)
4. Rigid body (RIGU) restrains
 C3A, N4B, C5A, C6A, C7A, C8A
 with sigma for 1-2 distances of 0.004 and sigma for 1-3 distances of 0.004
 C3B, C4B, C5B, C6B, C7B, N8B
 with sigma for 1-2 distances of 0.004 and sigma for 1-3 distances of 0.004
5. Others
 Sof(C3B)=Sof(C4B)=Sof(H4B)=Sof(C5B)=Sof(H5B)=Sof(C6B)=Sof(H6B)=Sof(C7B)=
 Sof(H7B)=Sof(N8B)=1-FVAR(1)
 Sof(C3A)=Sof(N4B)=Sof(C5A)=Sof(H5A)=Sof(C6A)=Sof(H6A)=Sof(C7A)=Sof(H7A)=
 Sof(C8A)=Sof(H8A)=FVAR(1)
6.a Aromatic/amide H refined with riding coordinates:
 C5A(H5A), C6A(H6A), C7A(H7A), C8A(H8A), C4B(H4B), C5B(H5B), C6B(H6B), C7B(H7B)
6.b Fitted hexagon refined as free rotating group:
 C3A(N4B,C5A,C6A,C7A,C8A), C3B(C4B,C5B,C6B,C7B,N8B)
;
_olex2_submission_special_instructions 'No special instructions were received'
_shelx_res_checksum              22620