Process for producing tetrahydroisoalpha acids

Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing

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568350, 426600, C07C 4567

Patent

active

056000120

ABSTRACT:
Tetrahydro-iso-.alpha.-acids ("THIAA") are prepared directly from iso-.alpha.-acids ("IAA") by hydrogenation. Free IAA are first dissolved in ethanol. The solution is then hydrogenated in the presence of a particular type of noble metal catalyst. Hydrogenation is controlled naturally by the reaction between the catalyst and the IAA so that the IAA will be selectively converted to THIAA without unacceptable perhydrogenation into other forms.

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Bruce A. Hay and John W. Homiski: Efficient One-Step Preparation of the Beer Additive Tetrahydroiso.alpha.-Acids (1991) (pp. 1732-1734).
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