MASS SPECTROMETRIC STUDY OF LINEAR AND CYCLIC PHOSPHONOACETALS

Abstract

Electron impact mass spectra of a homologous series of linear phosphonoacetals and of 2-ethylphosphonoester substituted 1,3-dioxolan and 1,3-dioxan systems are discussed and compared. Results indicate direct involvement of the phosphoryl group on the formation of intermediates from the acetalic linkage. In monocyclic derivatives the main fragmentation follows expulsion of the phosphorus substituent. In bicyclic derivatives of hexitols another degradation pattern is found beside the expected “h-rupture''.