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Dive into the research topics where Hansgeorg Ernst is active.

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Featured researches published by Hansgeorg Ernst.


Archive | 1996

Wittig and Horner-Emmons Reaction

Hansgeorg Ernst; Peter Dr. Münster

As has been shown in previous Chapters the Wittig and the Horner-Emmons reactions are of utmost importance for the coupling of carotenoid end groups with the polyene chain. In the following example, the synthesis of the naturally occurring C25-apocarotenal 507 (12′-apo-β- caroten-12′-al, β-apo-12′-carotenal) and also ethyl 8’-apo-β-caroten-8’-oate (1) (β-apo-8′- carotenoic acid ethyl ester), which is produced industrially by means of these reactions, is described.


Archive | 1994

Preparation of astaxanthin novel intermediates therefor and the preparation thereof

Hansgeorg Ernst; Walter Dobler; Joachim Paust; Udo Rheude


Archive | 2003

Process for the preparation of meso-zeaxanthin

Hansgeorg Ernst; Klaus Henrich; Klaus Ditrich


Archive | 1996

Preparation of astaxanthin

Wolfgang Krause; Klaus Henrich; Joachim Paust; Hansgeorg Ernst


Chemische Berichte | 1981

Reaktionen an Indolderivaten, XLII1) Stereoselektive Synthese tetracyclischer Methylenlactame

Hansgeorg Ernst; Bernhard Hauser; Ekkehard Winterfeldt


Archive | 2003

Method for producing carotenoids

Hansgeorg Ernst; Klaus Henrich; Andreas Keller


Archive | 1981

Improved process for the preparation of beta-chloroisobutyric acid

Hansgeorg Ernst; Joachim Dr. Paust


Archive | 1984

Novel optically active chroman derivatives, their preparation and novel intermediates

Henning-peter Gehrken; Hansgeorg Ernst; Joachim Paust


Archive | 2002

Process for preparing 2,7-dimethyl-2,4,6-octatrienal monoacetals

Hansgeorg Ernst; Klaus Henrich


Archive | 1996

Process for the preparation of astaxanthin

Wolfgang Krause; Klaus Henrich; Joachim Dr. Paust; Hansgeorg Ernst

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