Aryl cation chemistry as an emerging versatile tool for metal-free arylations.

[摘要]：A review. The development of transition-metal-free arylation procedures represents a key goal in modern org. synthesis. A green arylation can be obtained by having recourse to light as a "clean" reagent in place of toxic metals. In particular, a new method based upon the photoheterolytic fragmentation of substituted aryl halides or esters, with the formation of aryl cations has recently emerged. The peculiar reactivity of these cations with carbon nucleophiles allows several straightforward photo-arylations, which compare favorably with other thermal or photochem. metal-free analogs.

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