Summary
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1.
The reaction of aldehydes with dialkyl hydrogen phosphites and ammonia has been investigated and it has been established that when heat is applieda-aminoalkylphosphonic esters are formed; on hydrolysis these yield the free acids.
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2.
By this methoda-amino phosphonic acids have been synthesized from benzaldehyde, p-tolualdehyde, p-isopropylbenzaldehyde, p-anisaldehyde, piperonal, and vanillin.
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3.
It has been shown that benzaldehyde reacts with dialkyl hydrogen phosphites and ammonia in the cold with formation ofa-hydroxybenzylphosphonic esters, which, on being heated with ammonia, are converted intoa-aminobenzylphosphonic esters.
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4.
A mechanism has been proposed for the reaction, in whicha-hydroxyalkylphosphonic esters play the part of intermediate products. A parallel has been drawn between the reaction observed and other reactions: Zelinsky's reaction, Rodionov's reaction, and the formation ofa-amino sulfonic acids from aldehydes and ammonium bisulfate.
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Kabachnik, M.I., Medved, T.Y. New method for the synthesis of 1-aminoalkylphosphonic acids Communication 1. Russ Chem Bull 2, 769–777 (1953). https://doi.org/10.1007/BF01178856
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DOI: https://doi.org/10.1007/BF01178856