Isopropyl ether decomposition temperature

A solution of 1-piperazino ethyl acetate (Q2 mol) in benzene (300 ml) is treated with 3,4.5-trimethoxy cinnamoyl chloride (0,2 mol) in the presence of sodium bicarbonate (0.3 mol). After contacting for one hour at room temperature, the mixture is refluxed for a further hour. The benzene solution is then treated with an aqueous solution of sodium bicarbonate. After evaporation of the solvent, a solid product is obtained which is recrystallized from isopropyl ether. Melting point = 96°C. This base, when treated with hydrochloric acid, gives a hydrochloride having a melting point of 200°C with decomposition. By the action of malaic acid the acid maleate is obtained, having a melting point of 130°C. 

The decomposition of isopropanol can lead to the formation of propene and/or isopropyl ether (depending on the reaction temperature) if the catalyst possesses acidic sites [8], The dehydrogenation process towards acetone requires the catalyst to possess redox properties [15]. 

The reactions are carried out at room temperature, except in the case of 2-methyl-5-isopropyl-acetophenone, which requires heat. The products are nearly insoluble in ether, benzene, petroleum ether and carbon tetrachloride, but dissolve in water or alcohol with decomposition. They cannot be recrystallised and hence impurities are removed by washing first with benzene and then with ether. The compounds are more or less unstable, some commencing to decompose at once and others not showing marked decomposition for a period of two weeks. Decomposition gives a reddish sticky mass with a strong lachrymatory, action and an odour like that of chloro-ketones. The following table shows the substances which have been obtained. 

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