New lithium-zincate approaches for the selective functionalisation of pyrazine: direct dideprotozincation vs. nucleophilic alkylation
Sharon E. Baillie; Victoria L. Blair; David C. Blakemore; Duncan Hay; Alan R. Kennedy; David C. Pryde; Eva Hevia; Chem.Commun. 48 (2012) 1985–; doi:10.1039/c2cc16959b

data_7107346
_publ_section_title
;
 New lithium-zincate approaches for the selective functionalisation of
 pyrazine: direct dideprotozincation vs. nucleophilic alkylation
;
_journal_name_full               Chem.Commun.
_journal_page_first              1985
_journal_paper_doi               10.1039/c2cc16959b
_journal_volume                  48
_journal_year                    2012
_chemical_formula_moiety         'C40 H70 N8 Zn3'
_chemical_formula_sum            'C40 H70 N8 Zn3'
_chemical_formula_weight         859.15
_chemical_name_systematic
;
?
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/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                 125.028(10)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   27.469(2)
_cell_length_b                   12.6321(5)
_cell_length_c                   16.5424(11)
_cell_measurement_reflns_used    4386
_cell_measurement_temperature    123(2)
_cell_measurement_theta_max      30.0669
_cell_measurement_theta_min      2.9382
_cell_volume                     4700.4(8)
_computing_cell_refinement
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.34.40 (release 27-08-2010 CrysAlis171 .NET)
(compiled Aug 27 2010,11:50:40)
;
_computing_data_collection
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.34.40 (release 27-08-2010 CrysAlis171 .NET)
(compiled Aug 27 2010,11:50:40)
;
_computing_data_reduction
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.34.40 (release 27-08-2010 CrysAlis171 .NET)
(compiled Aug 27 2010,11:50:40)
;
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      123(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.964
_diffrn_measurement_device_type  'Oxford Diffraction Xcalibur, E'
_diffrn_measurement_method       '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  0.0402
_diffrn_reflns_av_sigmaI/netI    0.0607
_diffrn_reflns_limit_h_max       37
_diffrn_reflns_limit_h_min       -35
_diffrn_reflns_limit_k_max       17
_diffrn_reflns_limit_k_min       -17
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -22
_diffrn_reflns_number            15271
_diffrn_reflns_theta_full        27.00
_diffrn_reflns_theta_max         29.00
_diffrn_reflns_theta_min         3.01
_exptl_absorpt_coefficient_mu    1.552
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.93531
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlisPro, Oxford Diffraction Ltd.,
Version 1.171.34.40 (release 27-08-2010 CrysAlis171 .NET)
(compiled Aug 27 2010,11:50:40)
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            red
_exptl_crystal_density_diffrn    1.214
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       'cut needle'
_exptl_crystal_F_000             1824
_exptl_crystal_size_max          0.21
_exptl_crystal_size_mid          0.15
_exptl_crystal_size_min          0.11
_refine_diff_density_max         0.553
_refine_diff_density_min         -0.360
_refine_diff_density_rms         0.077
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.024
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     240
_refine_ls_number_reflns         6041
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.024
_refine_ls_R_factor_all          0.0682
_refine_ls_R_factor_gt           0.0403
_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^)+(0.0313P)^2^+0.4997P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0740
_refine_ls_wR_factor_ref         0.0840
_reflns_number_gt                4389
_reflns_number_total             6041
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            c2cc16959b.txt
_cod_data_source_block           vb24
_cod_original_cell_volume        4700.4(5)
_cod_original_sg_symbol_H-M      C2/c
_cod_database_code               7107346