Addition, Substitution, and Ring-Contraction Reactions of Quinones with N-Heterocyclic Carbenes.
Ping, Lucy; Bak, JungMin; Kim, Youngmee; Bouffard, Jean; The Journal of organic chemistry 83 (2018) 9240–9249; doi:10.1021/acs.joc.8b01236

data_4035325
_publ_section_title
;
 Addition, Substitution, and Ring-Contraction Reactions of Quinones with
 N-Heterocyclic Carbenes.
;
_journal_issue                   16
_journal_name_full               'The Journal of organic chemistry'
_journal_page_first              9240
_journal_page_last               9249
_journal_paper_doi               10.1021/acs.joc.8b01236
_journal_volume                  83
_journal_year                    2018
_chemical_formula_sum            'C37 H48 N2 O2'
_chemical_formula_weight         552.77
_space_group_crystal_system      monoclinic
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_atom_sites_solution_hydrogens   geom
_audit_creation_method           'APEX2 v2014.1-1'
_cell_angle_alpha                90
_cell_angle_beta                 116.048(2)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   12.5595(5)
_cell_length_b                   22.6599(9)
_cell_length_c                   13.5242(5)
_cell_measurement_reflns_used    9346
_cell_measurement_temperature    296(2)
_cell_measurement_theta_max      20.23
_cell_measurement_theta_min      2.46
_cell_volume                     3458.0(2)
_computing_cell_refinement       'SAINT V8.34A (Bruker AXS Inc., 2013)'
_computing_data_collection       'Bruker Instrument Service v2014.5.0.0'
_computing_data_reduction        'SAINT V8.34A (Bruker AXS Inc., 2013)'
_computing_structure_refinement  'SHELXL-2014 (Sheldrick, 2015)'
_diffrn_ambient_temperature      296(2)
_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 0.997
_diffrn_measurement_device_type  'Bruker APEX-II CCD'
_diffrn_measurement_method       '\f and \w scans'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.1034
_diffrn_reflns_av_unetI/netI     0.0549
_diffrn_reflns_Laue_measured_fraction_full 1.000
_diffrn_reflns_Laue_measured_fraction_max 0.997
_diffrn_reflns_limit_h_max       16
_diffrn_reflns_limit_h_min       -16
_diffrn_reflns_limit_k_max       30
_diffrn_reflns_limit_k_min       -30
_diffrn_reflns_limit_l_max       18
_diffrn_reflns_limit_l_min       -18
_diffrn_reflns_number            121376
_diffrn_reflns_point_group_measured_fraction_full 1.000
_diffrn_reflns_point_group_measured_fraction_max 0.997
_diffrn_reflns_theta_full        25.242
_diffrn_reflns_theta_max         28.560
_diffrn_reflns_theta_min         1.797
_exptl_absorpt_coefficient_mu    0.065
_exptl_absorpt_correction_T_max  0.99
_exptl_absorpt_correction_T_min  0.95
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS V2012/1 (Bruker AXS Inc.)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.062
_exptl_crystal_description       block
_exptl_crystal_F_000             1200
_exptl_crystal_size_max          0.200
_exptl_crystal_size_mid          0.160
_exptl_crystal_size_min          0.120
_refine_diff_density_max         0.253
_refine_diff_density_min         -0.321
_refine_diff_density_rms         0.035
_refine_ls_extinction_coef       0.0052(7)
_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   1.013
_refine_ls_hydrogen_treatment    constr
_refine_ls_matrix_type           full
_refine_ls_number_parameters     422
_refine_ls_number_reflns         8805
_refine_ls_number_restraints     56
_refine_ls_restrained_S_all      1.035
_refine_ls_R_factor_all          0.1496
_refine_ls_R_factor_gt           0.0672
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0606P)^2^+1.0816P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1384
_refine_ls_wR_factor_ref         0.1756
_reflns_Friedel_coverage         0.000
_reflns_number_gt                4307
_reflns_number_total             8805
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            jo8b01236_si_004.cif
_cod_data_source_block           8a
_cod_original_sg_symbol_H-M      'P 21/n'
_cod_database_code               4035325
_shelx_estimated_absorpt_t_min   0.987
_shelx_estimated_absorpt_t_max   0.992
_shelxl_version_number           2013-4
_shelx_res_checksum              4256
_shelx_hkl_checksum              27632