cis-2,6-Dimethylpiperidide: a structural mimic for TMP (2,2,6,6-tetramethylpiperidide) or DA (diisopropylamide)?
Campbell, Ross; Conway, Ben; Fairweather, Graham S.; García-Alvarez, Pablo; Kennedy, Alan R.; Klett, Jan; Mulvey, Robert E.; O'Hara, Charles T; Robertson, Gemma M.; Dalton transactions (Cambridge, England : 2003) 39 (2010) 511–519; doi:10.1039/b910801g

data_7024086
_publ_section_title
;
 cis-2,6-Dimethylpiperidide: a structural mimic for TMP
 (2,2,6,6-tetramethylpiperidide) or DA (diisopropylamide)?
;
_journal_issue                   2
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              511
_journal_page_last               519
_journal_paper_doi               10.1039/b910801g
_journal_volume                  39
_journal_year                    2010
_chemical_absolute_configuration ad
_chemical_formula_sum            'C21 H48 Li N3 Zn'
_chemical_formula_weight         414.93
_chemical_name_systematic
;
?
;
_space_group_IT_number           4
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  'P 2yb'
_symmetry_space_group_name_H-M   'P 1 21 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                 108.761(4)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   8.3990(3)
_cell_length_b                   16.7308(4)
_cell_length_c                   9.5282(4)
_cell_measurement_reflns_used    7953
_cell_measurement_temperature    123(2)
_cell_measurement_theta_max      30.75
_cell_measurement_theta_min      2.54
_cell_volume                     1267.78(8)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      123(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.933
_diffrn_measurement_device_type  'Oxford Diffraction Gemini S'
_diffrn_measurement_method       'omega scans'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'x-ray tube '
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0204
_diffrn_reflns_av_sigmaI/netI    0.0338
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       23
_diffrn_reflns_limit_k_min       -23
_diffrn_reflns_limit_l_max       13
_diffrn_reflns_limit_l_min       -12
_diffrn_reflns_number            12776
_diffrn_reflns_theta_full        27.00
_diffrn_reflns_theta_max         30.46
_diffrn_reflns_theta_min         2.56
_exptl_absorpt_coefficient_mu    0.977
_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.86814
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
;
CrysAlis RED, Oxford Diffraction Ltd.,
Version 1.171.32.29 (release 10-06-2008 CrysAlis171 .NET)
(compiled Jun 10 2008,16:49:55)
Empirical absorption correction using spherical harmonics,
implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.087
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       fragment
_exptl_crystal_F_000             456
_exptl_crystal_size_max          0.5
_exptl_crystal_size_mid          0.4
_exptl_crystal_size_min          0.2
_refine_diff_density_max         0.433
_refine_diff_density_min         -0.195
_refine_diff_density_rms         0.041
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.036(7)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   0.975
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     248
_refine_ls_number_reflns         6035
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      0.975
_refine_ls_R_factor_all          0.0298
_refine_ls_R_factor_gt           0.0252
_refine_ls_shift/su_max          0.002
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0286P)^2^+0.0000P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0504
_refine_ls_wR_factor_ref         0.0512
_reflns_number_gt                5446
_reflns_number_total             6035
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            b910801g.txt
_cod_data_source_block           jkgem2
_cod_original_sg_symbol_H-M      P21
_cod_database_code               7024086