PRODUCTION OF FLUORINATED CYCLOPROPANES FROM THE REACTION BETWEEN CARBENES AND ALKENES

摘要

The invention relates to processes for the production of fluorinated cyclopropanes In particular, the invention relates to a process for the preparation of fluorinated cyclopropanes for use in compositions, often in heat transfer compositions. On process includes the step of reacting a carbene with a compound of formula (I) where R may be the same or different and is selected from fluorine, alkyl. alkox or hydrogen, wherein if all of the R groups are hydrogen, alkyl or alkoxy, the carbene includes at least one fluorine substituent. A second process includes th step of reacting a compound of formula (II) with a metal and optionally a metal halide to generate a fluorinated cyclopropane, wherein X may be the same or different and is selected from a halogen, alkyl. alkoxy or hydrogen.