摘要 |
An acetal of formula I: is described in which the radicals R<SUP>1 </SUP>to R<SUP>6 </SUP>independently of one another are eac hydrogen, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl or tert-butyl, n=0 or 1, and there is a single bond or double bond at the location of a broken line between two C atoms, any double bond present in the chain linking the aliphatic ring to the acetal group having the E or Z configuration, with the proviso that the number of double bonds incorporating a C atom of the aliphatic ring is 0 or 1, and the number of double bonds not incorporating a C atom of the aliphatic ring is 0 or 1.
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