TY - DATA T1 - Dynamic Behavior of N‑Heterocyclic Carbene Boranes: Boron–Carbene Bonds in B,B‑Disubstituted N,N‑Dimethylimidazol-2-ylidene Boranes Have Substantial Rotation Barriers PY - 2015/05/01 AU - Krishnan Damodaran AU - Xiben Li AU - Xiangcheng Pan AU - Dennis P. Curran UR - https://acs.figshare.com/articles/journal_contribution/Dynamic_Behavior_of_N_Heterocyclic_Carbene_Boranes_Boron_Carbene_Bonds_in_i_B_i_i_B_i_Disubstituted_i_N_i_i_N_i_Dimethylimidazol_2_ylidene_Boranes_Have_Substantial_Rotation_Barriers/2170642 DO - 10.1021/acs.joc.5b00324.s001 L4 - https://ndownloader.figshare.com/files/3804568 KW - group show KW - boron atom KW - measure rotation barriers KW - boron atoms KW - Dynamic Behavior KW - Bond KW - Substantial Rotation BarriersDynamic NMR spectroscopy KW - Borane N2 - Dynamic NMR spectroscopy has been used to measure rotation barriers in five B,B-disubstituted 1,3-dimethylimidazol-2-ylidene boranes. The barriers are attributed to the sp2–sp3 bond between C(1) of the N-heterocyclic carbene ring and the boron atom. Bonds to boron atoms bearing a thexyl (1,1,2-trimethylpropyl) group show especially high barriers, ranging from 75–86 kJ mol–1. 2-Isopropyl-1,3,5-trimethylbenzene is used as a comparable to help understand the nature and magnitude of the barriers. ER -