Replacement chlonde

Tnfluoromethanesulfenyl chlonde reacts with the indolizine nng to introduce tnfluoromethylsulfenyl groups at both positions 1 and 3 An acetyl group atposition 3 can be replaced by a trifluoromethanesulfenyl group, whereas the 3-benzoyl and 3 nitroso substituents are unaffected [/] (equation 1) (Table 1)... 

Vinyl and phenyl tnfluoromethyl groups are reactive m the presence of aluminum chloride [10 Replacement of fluorine by chlorine often occurs Polyfluori-nated tnfluoromethylbenzenes form reactive a,a-difluorobenzyl cations in antimony pentafluoride [77] 1 Phenylperfluoropropene cyclizes in aluminum chlonde to afford 1,1,3-trichloro 2 fluoromdene [10] (equation 10) The reaction IS hypothesized to proceed via an allylic carbocation, whose fluonde atoms undergo halogen exchange... 

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