Preparation of compounds containing a five-membered ring having two side-chains in ortho

Official title: Preparation of compounds containing a five-membered ring having two side-chains in ortho position to each other, and having at least one oxygen atom directly bound to the ring in ortho position to one of the side-chains, one side-chain containing, not directly bound to the ring, a carbon atom having three bonds to hetero atoms with at the most one bond to halogen, and the other side-chain having at least one oxygen atom bound in gamma-position to the ring, e.g. prostaglandins

C12P31/00 (Preparation of compounds containing a five-membered ring having two side-chains in ortho) appears on 28 US grants and 8 published applications in this corpus.