Organocatalytic Conjugate-Addition Polymerization of Linear and Cyclic Acrylic Monomers by N-Heterocyclic Carbenes: Mechanisms of Chain Initiation, Propagation, and Termination
Yuetao Zhang; Meghan Schmitt; Laura Falivene; Lucia Caporaso; Luigi Cavallo; Eugene Y.-X. Chen; Journal of the American Chemical Society 135 (2013) 17925–17942; doi:10.1021/ja4088677

data_4121204
_publ_section_title
;
 Organocatalytic Conjugate-Addition Polymerization of Linear and Cyclic
 Acrylic Monomers by N-Heterocyclic Carbenes: Mechanisms of Chain
 Initiation, Propagation, and Termination
;
_journal_name_full               'Journal of the American Chemical Society'
_journal_page_first              17925
_journal_page_last               17942
_journal_paper_doi               10.1021/ja4088677
_journal_volume                  135
_journal_year                    2013
_chemical_formula_moiety         'C26 H32 N2 O2'
_chemical_formula_sum            'C26 H32 N2 O2'
_chemical_formula_weight         404.54
_chemical_name_systematic
; 
 ? 
;
_space_group_IT_number           15
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/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                 113.260(8)
_cell_angle_gamma                90.00
_cell_formula_units_Z            8
_cell_length_a                   40.091(5)
_cell_length_b                   7.8348(9)
_cell_length_c                   16.111(2)
_cell_measurement_reflns_used    9973
_cell_measurement_temperature    100(2)
_cell_measurement_theta_max      28.08
_cell_measurement_theta_min      2.21
_cell_volume                     4649.2(10)
_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    'SHELXS-97 (Sheldrick, 1990)'
_diffrn_ambient_temperature      100(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  0.0328
_diffrn_reflns_av_sigmaI/netI    0.0206
_diffrn_reflns_limit_h_max       53
_diffrn_reflns_limit_h_min       -53
_diffrn_reflns_limit_k_max       10
_diffrn_reflns_limit_k_min       -9
_diffrn_reflns_limit_l_max       21
_diffrn_reflns_limit_l_min       -21
_diffrn_reflns_number            40348
_diffrn_reflns_theta_full        28.36
_diffrn_reflns_theta_max         28.36
_diffrn_reflns_theta_min         2.21
_exptl_absorpt_coefficient_mu    0.073
_exptl_absorpt_correction_T_max  0.7457
_exptl_absorpt_correction_T_min  0.6830
_exptl_absorpt_correction_type   multi-scan
_exptl_absorpt_process_details   'SADABS, Bruker(2000)'
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    1.156
_exptl_crystal_description       block
_exptl_crystal_F_000             1744
_exptl_crystal_size_max          0.658
_exptl_crystal_size_mid          0.329
_exptl_crystal_size_min          0.146
_refine_diff_density_max         0.192
_refine_diff_density_min         -0.172
_refine_diff_density_rms         0.033
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_ref   1.018
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     399
_refine_ls_number_reflns         5797
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.018
_refine_ls_R_factor_all          0.0668
_refine_ls_R_factor_gt           0.0440
_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^)+(0.0659P)^2^+1.6255P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1183
_refine_ls_wR_factor_ref         0.1357
_reflns_number_gt                4090
_reflns_number_total             5797
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            ja4088677_si_002.cif
_cod_data_source_block           ec68a
_cod_original_cell_volume        4649.3(10)
_cod_original_sg_symbol_Hall     '-C 2yc '
_cod_database_code               4121204