Intramolecular O-H...O Hydrogen-Bond-Mediated Reversal in the Partitioning of Conformationally Restricted Triplet 1,4-Biradicals and Amplification of Diastereodifferentiation in Their Lifetimes
Jarugu Narasimha Moorthy; Subhas Samanta; Apurba L. Koner; Satyajit Saha; Werner M. Nau; Journal of the American Chemical Society 130 (2008) 13608–13617; doi:10.1021/ja8032179

data_4108456
_publ_contact_author_address
;Departmet of chemistry
Indian Institute of Technology - Kanpur
Kanpur - 208 016
INDIA
;
_publ_contact_author_email       moorthy@iitk.ac.in
_publ_contact_author_fax         +915122597436
_publ_contact_author_name        'Prof. J. N. Moorthy'
_publ_contact_author_phone       +915122597498
_publ_section_title
;
 Intramolecular O-H...O Hydrogen-Bond-Mediated Reversal in the
 Partitioning of Conformationally Restricted Triplet 1,4-Biradicals and
 Amplification of Diastereodifferentiation in Their Lifetimes
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              13608
_journal_page_last               13617
_journal_paper_doi               10.1021/ja8032179
_journal_volume                  130
_journal_year                    2008
_chemical_formula_moiety         'C19 H20 O3'
_chemical_formula_sum            'C19 H20 O3'
_chemical_formula_weight         296.35
_chemical_name_common
'(1R,2S,3S,4R)-3-hydroxy-2-methyl-3,4-diphenylcyclobutyl acetate'
_chemical_name_systematic
; 
 (1R,2S,3S,4R)-3-hydroxy-2-methyl-3,4-diphenylcyclobutyl acetate
;
_space_group_IT_number           7
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      7
_symmetry_space_group_name_Hall  'P -2yac'
_symmetry_space_group_name_H-M   'P 1 n 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                 103.415(2)
_cell_angle_gamma                90.00
_cell_formula_units_Z            2
_cell_length_a                   10.3587(13)
_cell_length_b                   5.9712(7)
_cell_length_c                   13.2278(16)
_cell_measurement_temperature    293(2)
_cell_volume                     795.87(17)
_computing_cell_refinement       'Bruker SMART'
_computing_data_collection       'Bruker SMART'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'Bruker SHELXTL'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.995
_diffrn_measured_fraction_theta_max 0.995
_diffrn_measurement_device_type  'CCD area detector'
_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  0.0276
_diffrn_reflns_av_sigmaI/netI    0.0380
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       7
_diffrn_reflns_limit_k_min       -7
_diffrn_reflns_limit_l_max       11
_diffrn_reflns_limit_l_min       -16
_diffrn_reflns_number            4243
_diffrn_reflns_theta_full        25.99
_diffrn_reflns_theta_max         25.99
_diffrn_reflns_theta_min         2.84
_exptl_absorpt_coefficient_mu    0.083
_exptl_absorpt_correction_type   none
_exptl_crystal_colour            Colorless
_exptl_crystal_density_diffrn    1.237
_exptl_crystal_description       Clusters
_exptl_crystal_F_000             316
_exptl_crystal_size_max          0.20
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.194
_refine_diff_density_min         -0.169
_refine_diff_density_rms         0.039
_refine_ls_abs_structure_details 'Flack H D (1983), Acta Cryst. A39, 876-881'
_refine_ls_abs_structure_Flack   0.6(13)
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.054
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     202
_refine_ls_number_reflns         2143
_refine_ls_number_restraints     2
_refine_ls_restrained_S_all      1.053
_refine_ls_R_factor_all          0.0442
_refine_ls_R_factor_gt           0.0384
_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^)+(0.0495P)^2^+0.0680P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0905
_refine_ls_wR_factor_ref         0.0950
_reflns_number_gt                1910
_reflns_number_total             2143
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja8032179_si_004.cif
_cod_data_source_block           9-anti-CB2
_cod_database_code               4108456