In continuation of our studies on the reactivity of tertiary stibines,' we have found a new aldehyde-selective acetaliza- tion method which should be applicable to acid-sensitive or protic solvent-sensitive aldehydes. To our knowledge, although acetalization has been performed by many methods,2 the use of organometallic compounds has scarcely been reported. Usually, acetalization is accomplished with alcohols or orthoformic esters in an acidic medium by ...