Tetrahedron Reports on Organic Chemistry, Volume 3 contains 10 tetrahedron reports on organic chemistry with report numbers 21-30. Some reports focus on synthetic uses of anodic substitution reactions; an empirical analysis of the circular dichroism of chiral olefins; structure and reactivity of cycloimmonium ylides; the mechanism of epoxidation of olefins by peracids; regiospecific preparation and synthetic uses of ketone enolates. Other tetrahedron reports center on aspects of the formation and use of stenhouse salts and related compounds; synthesis of macrolides; interesting aspects of marine natural products chemistry; participation of isomeric tRNA's in the partial reactions of protein biosynthesis; biosynthesis of β-lactam antibiotics.