Fluorine-containing carbenes

Two other fluorine-containing diazirines give similar results. Cyanofluorodiazirine (223) and fluoromethoxydiazirine (224) release nitrogen at 100 °C the carbenes formed can be trapped by tetrafluoroethylene to give cyclopropanes (65JHC371). Without a carbene trap alkenes are obtained. 

Fluoromethylene and polyfluoroalkylmethylene units can be introduced into various molecules by a variety of processes that, overall, involve a-elimination from the original fluorocarbon system. The processes themselves are carbenoid but may not necessarily involve carbene intermediates. There are many carbenoid procedures available for the insertion of fluorine-containing imits and they can be roughly divided into the following four types [40, 41]. 

Partially because of last minute cancellations, several important topics have not been included in the present work. Papers on fluorine atom chemical lasers, high-energy fluorine atom reactions, and classical trajectory simulations of hydrogen transfer reactions by atomic fluorine are conspicuously absent. Other more speciahzed topics not included were olefin addition reactions by fluorine-rich carbenes, H2/F2 explosions, unimolecular reaction d3mamics of fluorine-containing aliphatic radicals, and high-power fluorine atom lasers in energy research. 

Figure 6.26. Carbene reaction catalysed by rhodium(II) complexes containing fluorinated...

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