HIGHLIGHTS
SUMMARY
There are only a few methods and approaches to synthesize five-membered organoboron compounds. 2,5-Dihydro1H-borole (borol-3-enes, 1-boracyclopent-3-enes) derivatives were originally prepared by Zweifel from conjugated enynes in a two-step reaction sequence involving the hydroboration and subsequent photocyclization of dienylborane. Herberich reported the preparation of 2,3- and 2,5-dihydro-1H-boroles via the reaction of the Cl2 BNR2 substrate with an oligomeric "butadiene-magnesium" reagent. This review summarizes and systematizes the results of the authors` studies on the synthesis and study of the properties . . .
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