Experimental and Computational Studies on Interrupted Nazarov Reactions: Exploration of Umpolung Reactivity at the α-Carbon of Cyclopentanones.
Wu, Yen-Ku; Dunbar, Christine R.; McDonald, Robert; Ferguson, Michael J.; West, F. G.; Journal of the American Chemical Society 136 (2014) 14903–14911; doi:10.1021/ja507638r

data_4122930
_publ_section_title
;
 Experimental and Computational Studies on Interrupted Nazarov Reactions:
 Exploration of Umpolung Reactivity at the \a-Carbon of Cyclopentanones.
;
_journal_issue                   42
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              14903
_journal_page_last               14911
_journal_paper_doi               10.1021/ja507638r
_journal_volume                  136
_journal_year                    2014
_chemical_formula_moiety         'C23 H22 O2'
_chemical_formula_sum            'C23 H22 O2'
_chemical_formula_weight         330.41
_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                 110.7546(8)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   8.8571(6)
_cell_length_b                   26.3976(17)
_cell_length_c                   8.4439(5)
_cell_measurement_reflns_used    5565
_cell_measurement_temperature    173(2)
_cell_measurement_theta_max      22.76
_cell_measurement_theta_min      2.46
_cell_volume                     1846.1(2)
_computing_cell_refinement       'Bruker SAINT'
_computing_data_collection       'Bruker APEX2'
_computing_data_reduction        'Bruker SAINT'
_computing_molecular_graphics    'Bruker SHELXTL'
_computing_publication_material  'Bruker SHELXTL'
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 2008)'
_computing_structure_solution    'SHELXD (Schneider & Sheldrick, 2002)'
_diffrn_ambient_temperature      173(2)
_diffrn_measured_fraction_theta_full 0.999
_diffrn_measured_fraction_theta_max 0.999
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\w 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  0.0295
_diffrn_reflns_av_sigmaI/netI    0.0225
_diffrn_reflns_limit_h_max       11
_diffrn_reflns_limit_h_min       -11
_diffrn_reflns_limit_k_max       33
_diffrn_reflns_limit_k_min       -33
_diffrn_reflns_limit_l_max       10
_diffrn_reflns_limit_l_min       -10
_diffrn_reflns_number            14867
_diffrn_reflns_theta_full        26.48
_diffrn_reflns_theta_max         26.48
_diffrn_reflns_theta_min         1.54
_exptl_absorpt_coefficient_mu    0.074
_exptl_absorpt_correction_T_max  1.0000
_exptl_absorpt_correction_T_min  0.9090
_exptl_absorpt_correction_type   integration
_exptl_absorpt_process_details   'SADABS (Sheldrick, 2008)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.189
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       plate
_exptl_crystal_F_000             704
_exptl_crystal_size_max          0.47
_exptl_crystal_size_mid          0.30
_exptl_crystal_size_min          0.08
_refine_diff_density_max         0.201
_refine_diff_density_min         -0.253
_refine_diff_density_rms         0.036
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.041
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     226
_refine_ls_number_reflns         3821
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.041
_refine_ls_R_factor_all          0.0598
_refine_ls_R_factor_gt           0.0441
_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^)+(0.0513P)^2^+0.5331P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1098
_refine_ls_wR_factor_ref         0.1193
_reflns_number_gt                2914
_reflns_number_total             3821
_reflns_threshold_expression     I>2\s(I)
_cod_data_source_file            ja507638r_si_001.cif
_cod_data_source_block           14a
_cod_depositor_comments
;
The following automatic conversions were performed:

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/usr/data/users/saulius/crontab/automatic-downloads/current/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 2827 2014-09-09 07:05:25Z andrius 
;
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               4122930
_shelxl_version_number           2008-4
_shelx_res_checksum              17781
_shelx_hkl_checksum              57605