Probing the efficiency of N-heterocyclic carbene promoted O- to C-carboxyl transfer of oxazolyl carbonates.
Thomson, Jennifer E.; Campbell, Craig D.; Concellón, Carmen; Duguet, Nicolas; Rix, Kathryn; Slawin, Alexandra M. Z.; Smith, Andrew D.; The Journal of organic chemistry 73 (2008) 2784–2791; doi:10.1021/jo702720a

data_4029541
_publ_section_title
;
 Probing the efficiency of N-heterocyclic carbene promoted O- to
 C-carboxyl transfer of oxazolyl carbonates.
;
_journal_issue                   7
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              2784
_journal_page_last               2791
_journal_paper_doi               10.1021/jo702720a
_journal_volume                  73
_journal_year                    2008
_chemical_formula_moiety         'C22 H19 N O4'
_chemical_formula_sum            'C22 H19 N O4'
_chemical_formula_weight         361.38
_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
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 92.776(6)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   18.420(3)
_cell_length_b                   5.2227(8)
_cell_length_c                   19.115(3)
_cell_measurement_reflns_used    11566
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      66.71
_cell_measurement_theta_min      2.47
_cell_volume                     1836.7(5)
_computing_cell_refinement       'CrystalClear (Rigaku Corp., 2004)'
_computing_data_collection       'CrystalClear (Rigaku Corp., 2004)'
_computing_data_reduction        'CrystalClear (Rigaku Corp., 2004)'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_computing_structure_solution    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.948
_diffrn_measured_fraction_theta_max 0.948
_diffrn_measurement_device_type  CCD
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_monochromator  confocal
_diffrn_radiation_source         'rotating anode'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54178
_diffrn_reflns_av_R_equivalents  0.0601
_diffrn_reflns_av_sigmaI/netI    0.0358
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       4
_diffrn_reflns_limit_k_min       -4
_diffrn_reflns_limit_l_max       17
_diffrn_reflns_limit_l_min       -17
_diffrn_reflns_number            8043
_diffrn_reflns_theta_full        45.61
_diffrn_reflns_theta_max         45.61
_diffrn_reflns_theta_min         2.40
_exptl_absorpt_coefficient_mu    0.736
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.9574
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'Jacobson, R. (1998) Private communication'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.307
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             760
_exptl_crystal_size_max          0.100
_exptl_crystal_size_mid          0.100
_exptl_crystal_size_min          0.050
_refine_diff_density_max         0.164
_refine_diff_density_min         -0.244
_refine_diff_density_rms         0.041
_refine_ls_extinction_coef       0.0041(6)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   1.296
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     251
_refine_ls_number_reflns         1448
_refine_ls_number_restraints     1
_refine_ls_restrained_S_all      1.296
_refine_ls_R_factor_all          0.0734
_refine_ls_R_factor_gt           0.0672
_refine_ls_shift/su_max          0.004
_refine_ls_shift/su_mean         0.001
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.0548P)^2^+2.1474P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1427
_refine_ls_wR_factor_ref         0.1458
_reflns_number_gt                1378
_reflns_number_total             1448
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            jo702720a-file003.cif
_cod_data_source_block           66
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/usr/data/users/saulius/automatic-downloads/retrospective/ACS/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 2281 2013-09-26 08:29:07Z andrius 
;
_cod_original_sg_symbol_H-M      P2(1)/c
_cod_database_code               4029541