Boron-containing four-membered rings are less studied than five- and six-membered boron rings owing to limited preparative approaches. Now a triplet energy transfer strategy has been developed for the synthesis of strained, air-stable benzoboretenes through the intramolecular coupling of boron–carbon-centred diradicals. The preparation of dihydroborinine and dihydrocyclopropaborole derivatives has also been achieved.
- Xinmou Wang
- Peiqi Zhang
- Yangjian Quan
