- Preparation method of citronellal hydrate
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The invention relates to a preparation method of citronellal hydrate. The method comprises the steps of citronellal oxazolidine derivative preparation, solid acid catalytic reaction, aftertreatment and the like. The purity of a citronellal hydrate product prepared by using the method provided by the invention reaches 95% or above. The method provided by the invention has the characteristics that asolid acidification catalyst is easily separated from a reactant, can be repeatedly used and cannot corrode a reactor, catalytic public hazards are reduced, and the wastewater amount is greatly reduced. By using the method provided by the invention, an environment-friendly synthesis process route is achieved.
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Paragraph 0065; 0067; 0068; 0076; 0084; 0092; 0100
(2018/04/03)
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- PREPARATION OF DERIVATIVES OF CITRONELLAL
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The hydrogenation of citronellal and citral, if not separated from ethereal oils, leads regioselectively to dihydrocitronellal and citronellal, respectively.The reaction of citral with (+)-ephedrin or L-aspartic acid, followed by hydrogenation and deblocking the aldehyde function, yields optically active citronellal.Reacting the aldehyde function of citronellal with diethanolamine, piperidine or morpholine, the alcohol addition to the 6,7-double bond results in 7-alkoxy substituted citronellals with acceptable yield.The formation of 7-hydroxy-6,7-dihydrocitronellal during this reaction has been proved and the effect of reaction parameters on the yield have been discussed.
- Koertvelyessy, Gyula
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p. 347 - 354
(2007/10/02)
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