An unexpected Rearrangement of Dimethyl-Allyl-2-Hydroxyethyl Quaternary Ammonium
Salts in an Alkaline Medium
G H Torosyan*
National polytechnic university of Armenia, Armenia
Submission: January 25, 2018; Published: January 29, 2018
*Corresponding author: Gagik Torosyan, Doctor of Chemical sciences, National Polytechnic University of Armenia, Armenia, Tel: 0037493 998830; Email: [email protected]
How to cite this article: G H Torosyan. An unexpected Rearrangement of Dimethyl-Allyl-2-Hydroxyethyl Quaternary Ammonium Salts in an Alkaline Medium. Organic & Medicinal Chem IJ. 2018; 5(2): 555658. DOI: 10.19080/OMCIJ.2018.05.555658
It's known intramolecular O-benzylation of dimethylbenzyl- 2-hydroxyethylammonium chloride at 175-1800C with the formation of dimethylaminoethanol benzyl ether chlorohydrate with a low yield - 5-20% . The same salt undergoes to Sommelet rearrangement in a strong alkaline medium with the formation of corresponding tertiary amine .
It's known also that containing an allyl or benzyl group serve as alkylating agents due to the easy cleavage of these groups .
There are presented the results about behavior of N,N-dimethyl-N-allyl-N-2-hydroxymethyl ( DMAHMAmBr) ammonium bromide in alkaline solution.
Heating of DMAHMAmBr at 100-105�C in a two-phase "liquid-liquid" catalytic system with one time distillation of water and the resulting light-boiling products leads to the formation of dimethylallylamine (way A) and dimethyl-2-allyloxyethylamine (way B)with yields of 30 and 22%, respectively.
Heating of DMAHMAmBr over the powdered alkali leads to the same products with yields of 11 and 35%, respectively, as well as the croton condensation product of penten-4-al (way A). The same Quat in the presence of powdered alkali in dry toluene splits along path a to form dimethylamylamine (yield 93%) and acetylene (way A).
The amyl analogue of these salt in the same conditions gives N,N-dimethyl-N- amyl amine and acetylene ( way A) (Figure 1).
The benzyl analogue of these salt is cleaved analogously DMAHMAmBr, but in a low yield for the N,N-dimethyl-N- benzyloxyethylamine obtained (11%). The results obtained testify to the intramolecular transition of the allyl and benzyl groups from the nitrogen atom to oxygen. The structure synthesized products were proved by IR, UV, 1HNMR and Mass spectrometry.