| 摘要 |
Prepn. of new carbonyl cpds. comprises reacting carbonyl cpds. with organic halogen cpds. or aldehydes, to form carbonyl cpds. having a higher mol. wt. than the starting materials. New carbonyl cpds. have formula: F3=CR21-CR22O (I). Gp. C=F3 is opt. substd. 6 C cycloalkyl or cycloalkenyl. Either (i) R21 is H and R22 is a C-atom substd. by 1 or 2 of gps.: - CH...R24 ; - CH2CH:CH2 or CH2CMe:CH2 , in which R24 is alkyl, e.g. Et, alkenyl or alkylidene; or (ii) R22 is Me or H and R21 is an allyl or methallyl gp. haveing one of formulae - CH2CH:CH2 or - CH2CMe:CH2 . Alternatively Gp. C=F3 may be an acyclic hydrocarbyl, in which case (I) is 2,4,7-trimethyl-2,6-octadienal). (I) are used as aromatic essences for modifying aroma and taste of food, tobacco, beverages, and for perfumes and perfumed articles. In an example, 2,5-dimethyl-2-propenyl-hex-4-enal is prepd. by mixing 2-methyl-pent-2-enal and prenyl chloride in the presence of toluene, tricepryl methyl ammonium chloride and aq. NaOH. |
