[Letters to Editor]

Abstract

As Spring noted in his report, due credit must be given to the chemists of the Shell Development Company of California for their original success in effecting the vapour-phase halogenation of olefines in the allyl position. While their evidence for the atomic mechanism of this process might have received mention, there can now be few chemists who would picture a homogeneous gas reaction of this type as anything other than a free radical process.