| abstract |
Compounds of the formula in which R 1 , R 2 and R 3 independently of one another represent hydrogen, a branched or unbranched alkyl chain having one to six carbon atoms or a branched or unbranched alkyl ether chain having one to six carbon atoms or R 1 and R 2 are an aliphatic ring-closing group with three or four ring members which represent carbon or oxygen, and R 3 represents hydrogen, a branched or unbranched alkyl chain having one to six carbon atoms or a branched or unbranched alkyl ether chain having one to six carbon atoms, the substance is not 2-acetyl-benzaldehyde, or R 3 and R 2 are an aliphatic ring-closing group with three or four ring members which represent carbon or oxygen, and R 1 represents hydrogen, a branched or unbranched alkyl chain having one to six carbon atoms or a branched or unbranched alkyl ether chain having one to six carbon atoms. |