Wilke’s azaphospholene

Very recently, Leitner has reported cationic nickel(n) catalyst systems for the cycloisomerization of diethyl diallyl malonate that shows high activities and regioselectivities for the formation of diethyl 3-methylene-4-methylcyclo-pentane-l,l-dicarboxylate with ee values up to 80% when using Wilke s azaphospholene ligand.355... 

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