Novel aliphatic aldehydes and their preparation

US4758548A · kind A · utility

Assignee

• BASF SE

Inventors

• Walter Gramlich · Edingen-Neckarhausen, DE
• Hardo Siegel · Speyer, DE

Key dates

• Filing date: Jun 30, 1987
• Grant date: Jul 19, 1988
• Expiry date: Jun 30, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C47/21
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Aliphatic aldehydes of the general formula I ##STR1## where R.sup.1 is hydrogen or methyl, PA0 R.sup.2 is a straight-chain or branched alkyl radical of 1 to 4 carbon atoms and the two radicals X are each hydrogen or together form a further C--C bond, in particular PA1 2,5,7,7-tetramethyloctanal, PA1 2,4,5,7,7-pentamethyloctanal, PA1 2-ethyl-5,7,7-trimethyloctanal and PA1 2,5,7,7-tetramethyl-2-octen-1-al, are used in scent compositions and are prepared by a process in which an aldehyde of the general formula II ##STR2## is condensed with an aldehyde of the general formula III ##STR3## in the presence of an aldol condensation catalyst to give the substituted octenal of the general formula I, and, if required, the latter is partially hydrogenated or reduced to give the ocorresponding octanal of the formula I.