Synthesis and stability of cyclic α-hydrogen nitroxides.
Toledo, Hila; Amar, Michal; Bar, Sukanta; Iron, Mark A.; Fridman, Natalia; Tumanskii, Boris; Shimon, Linda J. W.; Botoshansky, Mark; Szpilman, Alex M.; Organic & biomolecular chemistry 13 (2015) 10726–10733; doi:10.1039/c5ob01443c

data_7154667
_publ_section_title
;
 Synthesis and stability of cyclic \a-hydrogen nitroxides.
;
_journal_issue                   43
_journal_name_full               'Organic &amp; biomolecular chemistry'
_journal_page_first              10726
_journal_page_last               10733
_journal_paper_doi               10.1039/c5ob01443c
_journal_volume                  13
_journal_year                    2015
_chemical_absolute_configuration unk
_chemical_formula_moiety         'C43 H67 N O5 Si2'
_chemical_formula_sum            'C43 H67 N O5 Si2'
_chemical_formula_weight         734.16
_chemical_name_systematic
'Ethyl-2-hydroxy-3-mesityl-1-methyl-4,9-bis((triisopropylsilyl)oxy)-2,3-dihydro-1H-benzo[f]isoindole-1-carboxylate '
_space_group_IT_number           2
_symmetry_cell_setting           triclinic
_symmetry_space_group_name_Hall  '-P 1'
_symmetry_space_group_name_H-M   'P -1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_block_doi                 10.5517/cc13tbpy
_audit_creation_method           SHELXL-97
_audit_update_record
;
2014-12-02 deposited with the CCDC.
2015-08-24 downloaded from the CCDC.
;
_cell_angle_alpha                86.145(14)
_cell_angle_beta                 85.326(10)
_cell_angle_gamma                85.326(19)
_cell_formula_units_Z            2
_cell_length_a                   9.644(4)
_cell_length_b                   12.021(6)
_cell_length_c                   18.923(6)
_cell_measurement_reflns_used    5776
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      24.17
_cell_measurement_theta_min      1.08
_cell_volume                     2175.1(16)
_computing_cell_refinement       'DENZO HKL2000 (Otwinowski & Minor 1997)'
_computing_data_collection       'Collect (Nonius, 2006)'
_computing_data_reduction        'DENZO HKL2000 (Otwinowski & Minor 1997)'
_computing_molecular_graphics    'Mercury 3.1'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      293(2)
_diffrn_detector_area_resol_mean 95
_diffrn_measured_fraction_theta_full 0.997
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Nonius KappaCCD'
_diffrn_measurement_method       'phi- and 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  0.0880
_diffrn_reflns_av_sigmaI/netI    0.0594
_diffrn_reflns_limit_h_max       10
_diffrn_reflns_limit_h_min       0
_diffrn_reflns_limit_k_max       13
_diffrn_reflns_limit_k_min       -13
_diffrn_reflns_limit_l_max       20
_diffrn_reflns_limit_l_min       -20
_diffrn_reflns_number            6274
_diffrn_reflns_theta_full        24.17
_diffrn_reflns_theta_max         24.17
_diffrn_reflns_theta_min         1.08
_diffrn_standards_decay_%        none
_diffrn_standards_interval_count none
_diffrn_standards_interval_time  none
_diffrn_standards_number         none
_exptl_absorpt_coefficient_mu    0.123
_exptl_absorpt_correction_T_max  0.9711
_exptl_absorpt_correction_T_min  0.9467
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details
; 
'HKL Denzo and Scalepack (Otwinowski & Minor 1997)'  
;
_exptl_crystal_colour            colorless
_exptl_crystal_density_diffrn    1.121
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             800
_exptl_crystal_recrystallization_method
'Re-crystallisation from solvent: ethylacetate/hexane'
_exptl_crystal_size_max          0.45
_exptl_crystal_size_mid          0.27
_exptl_crystal_size_min          0.24
_refine_diff_density_max         1.022
_refine_diff_density_min         -0.491
_refine_diff_density_rms         0.054
_refine_ls_abs_structure_details unk
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.034
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     462
_refine_ls_number_reflns         6274
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.034
_refine_ls_R_factor_all          0.1103
_refine_ls_R_factor_gt           0.0763
_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^)+(0.1107P)^2^+1.9048P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1937
_refine_ls_wR_factor_ref         0.2167
_reflns_number_gt                4426
_reflns_number_total             6274
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            c5ob01443c2.cif
_cod_data_source_block           Szpilman2
_cod_depositor_comments
'Adding full bibliography for 7154666--7154672.cif.'
_cod_original_cell_volume        2175.1(15)
_cod_database_code               7154667