Surface-assisted diastereoselective Ullmann coupling of bishelicenes†
Ullmann coupling of chiral 2-bromohelicene has been performed on a Cu(100) surface. Only homochiral 2,2′-bishelicene as the product is observed using STM. Such stereoselectivity is based on the fact that the surface will favour a configuration with the central part of the molecule on the surface, causing the outer ends to spiral away from the surface.
- This article is part of the themed collection: Chirality at the nanoscale