Abstract

New variously substituted 1-dimethylamino or 1-methylthio but-3-enylidene-bis-phosphonates have been prepared from readily availableα-dimethylamino or α-methylthio methylene-bis-phosphonates by postulated [2,3]-Wittig rearrangements of the corresponding N- or S-allylic intermediate ylides. © 1999 John Wiley & Sons, Inc. Heteroatom Chem 10: 281–289, 1999

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