Ammonium-Directed Olefinic Epoxidation: Kinetic and Mechanistic Insights
Méabh B. Brennan; Timothy D. W. Claridge; Richard G. Compton; Stephen G. Davies; Ai M. Fletcher; Martin C. Henstridge; David S. Hewings; Wataru Kurosawa; James A. Lee; Paul M. Roberts; Anne K. Schoonen; James E. Thomson; Journal of Organic Chemistry 77 (2012) 7241–7261; doi:10.1021/jo3010556

data_4027430
_publ_contact_author             'Stephen G. Davies'
_publ_contact_author_email       steve.davies@chem.ox.ac.uk
_publ_contact_author_fax         '+44 1865 275633'
_publ_contact_author_phone       '+44 1865 275695'
_publ_section_title
;
 Ammonium-Directed Olefinic Epoxidation: Kinetic and Mechanistic Insights
;
_journal_name_full               'Journal of Organic Chemistry'
_journal_page_first              7241
_journal_page_last               7261
_journal_paper_doi               10.1021/jo3010556
_journal_volume                  77
_journal_year                    2012
_chemical_formula_moiety         'C21 H27 N1 O4 S1'
_chemical_formula_sum            'C21 H27 N O4 S'
_chemical_formula_weight         389.52
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_cell_angle_alpha                90
_cell_angle_beta                 98.2484(8)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   9.9494(2)
_cell_length_b                   12.3440(2)
_cell_length_c                   16.4318(3)
_cell_measurement_reflns_used    4437
_cell_measurement_temperature    150
_cell_measurement_theta_max      27
_cell_measurement_theta_min      5
_cell_volume                     1997.20(6)
_computing_cell_refinement       'DENZO/SCALEPACK (Otwinowski & Minor, 1997)'
_computing_data_collection       'COLLECT (Nonius, 1997-2001).'
_computing_data_reduction        'DENZO/SCALEPACK (Otwinowski & Minor, 1997)'
_computing_molecular_graphics    'CAMERON (Watkin et al., 1996)'
_computing_publication_material  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_refinement  'CRYSTALS (Betteridge et al., 2003)'
_computing_structure_solution    'SIR92 (Altomare et al., 1994)'
_diffrn_ambient_temperature      150
_diffrn_measured_fraction_theta_full 0.991
_diffrn_measured_fraction_theta_max 0.990
_diffrn_measurement_device       'Nonius KappaCCD'
_diffrn_measurement_device_type  Area
_diffrn_measurement_method       \w
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_type           'Mo K\a'
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.026
_diffrn_reflns_limit_h_max       12
_diffrn_reflns_limit_h_min       -12
_diffrn_reflns_limit_k_max       14
_diffrn_reflns_limit_k_min       -15
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            8436
_diffrn_reflns_theta_full        25.836
_diffrn_reflns_theta_max         27.485
_diffrn_reflns_theta_min         5.111
_diffrn_standards_number         0
_exptl_absorpt_coefficient_mu    0.188
_exptl_absorpt_correction_T_max  0.98
_exptl_absorpt_correction_T_min  0.98
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'DENZO/SCALEPACK (Otwinowski & Minor, 1997)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.295
_exptl_crystal_description       plate
_exptl_crystal_F_000             832
_exptl_crystal_size_max          0.30
_exptl_crystal_size_mid          0.10
_exptl_crystal_size_min          0.10
_refine_diff_density_max         0.18
_refine_diff_density_min         -0.38
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.1342
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     244
_refine_ls_number_reflns         2907
_refine_ls_number_restraints     0
_refine_ls_R_factor_all          0.0744
_refine_ls_R_factor_gt           0.0439
_refine_ls_shift/su_max          0.000437
_refine_ls_structure_factor_coef F
_refine_ls_weighting_details
;
Method, part 1, Chebychev polynomial, (Watkin, 1994, Prince, 1982)
[weight] = 1.0/[A~0~*T~0~(x)+A~1~*T~1~(x) ... +A~n-1~]*T~n-1~(x)]
where A~i~ are the Chebychev coefficients listed below and x= Fcalc/Fmax
Method = Robust Weighting (Prince, 1982)
W = [weight] * [1-(deltaF/6*sigmaF)^2^]^2^
A~i~ are:
0.285 0.668E-01 0.362E-01
;
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_all         0.0803
_refine_ls_wR_factor_gt          0.0440
_refine_ls_wR_factor_ref         0.0414
_reflns_limit_h_max              12
_reflns_limit_h_min              -12
_reflns_limit_k_max              15
_reflns_limit_k_min              0
_reflns_limit_l_max              21
_reflns_limit_l_min              0
_reflns_number_gt                3150
_reflns_number_total             4535
_reflns_threshold_expression     I>2.0\s(I)
_oxford_diffrn_Wilson_B_factor   2.59
_oxford_diffrn_Wilson_scale      7.31
_oxford_refine_ls_r_factor_ref   0.0404
_oxford_refine_ls_scale          0.3754(6)
_oxford_reflns_number_all        4535
_oxford_reflns_threshold_expression_ref I>3.0\s(I)
_cod_data_source_file            jo3010556_si_001_3.cif
_cod_data_source_block           21
_cod_original_formula_sum        'C21 H27 N1 O4 S1'
_cod_database_code               4027430