The CH,OH elimination from one of the a-cleavage ions produced by fragmentation of the methyl esters of long-chain amino-acids is triggered by the interaction of both functional groups, even when these are located far apart. It involves, in part, one of the hydrogen atoms from theaminogroup and in part, one of the hydrogen atoms of the methylene group c( to the NH,-bearing carbon. Mechanisms for these eliminations are proposed and a comparison is made with the fragmentations of the w-amino esters, previously studied.R6sum6-L'klimination de CH,OH A partir d'un des ions de coupure a produits par la fragmentation

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Die Peroxide (I) bzw. (XI) gehen bei Bestrahlung in Gemische der Acetale (II) bzw. (XII) und der Diketone (III) bzw. (XIII) über.