E. Zymanczykduda et al., ESTERIFICATION OF PHOSPHONIC AND PHOSPHINIC ACID ANALOGS OF GLUTAMIC AND ASPARTIC ACIDS WITH ETHYL ORTHOFORMATE - SCOPE AND LIMITATIONS OF THE METHOD, Phosphorus, sulfur and silicon and the related elements, 112(1-4), 1996, pp. 47-55
Reaction of C-ethyl esters of phosphonic- and phosphinic acid analogue
s of glutamic and aspartic acids with ethyl orthoformate provides the
mixtures of N-formylamino- and N-ethoxymethyleneimino-derivatives with
nearly quantitative yields. Scape and limitations of this procedure w
ere studied by means of GC/MS technique.