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N-heterocyclic carbene(NHC)is very important Fischer carbene,which the lone pair electron in the HOMO of NHC locates at the single carbon atom.In contrast,the lone pair electron in the HOMO of the derivatives of 2-borabicyclo[1.1.0]but-1(3)-ene(2BB)can locate at two carbons owe to charge-shift bonding characteristics,2BB is named as charge-shift carbine herein.