Since the first allenic compound, uiz., allene itself, was synthesized one-hundred years ago2 several methods for the preparation of this class of compounds have become available. Some of these methods are quite impractical because mixtures with the corresponding acetylenes and other isomers are frequently encountered. On the basis of prior work by Doering and LaFlamme, 3 a two-step synthesis of allenes from olefins was developed ...