Catalytic cycloisomerization of enynes has been accomplished in the presence of an Ni0-PPh3-Zn-carboxylic acid or -ZnCl2 system. A nickel(I)-hydride complex, thought to be generated by reduction of the protonated nickel(II) complex with Zn, is proposed as the catalytic species. This cycloisomerization shows reactivity behavior that is different from that of a conventional metal-catalyzed reaction. In particular
A Metathesis Approach to Volatile Olefins: Synthesis of 18O-Allyl Alcohol
作者:Guy C. Lloyd-Jones、Sophie Purser
DOI:10.1002/chem.201100271
日期:2011.4.18
A neat reaction: A ring‐closing metathesis (RCM) strategy is presented in which the two termini of a light, and thus volatile, isotopically labelled olefin are held separate by way of a higher molecular weight diene component, allowing synthetic manipulations to be conducted without difficulty. Using simple laboratory apparatus, a solvent‐free catalytic RCM process can be achieved that avoids side