- Photochemical reactions of P-mentha-13,8-triene and structural related P-menthadienes
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The photochemical and thermal behaviour of cyclic olefins like p-mentha-1,3,8-triene (2) and structural related p-mentha-1,3- and -1,4-dienes under the influence of oxygen have been investigated. Dehydration, ring opening, (4+2)-cycloaddition of singlet oxygen1 and dimerization were observed as concurring mechanisms. The photochemical and thermal dehydrogenation of α-terpinene (1), α-phellandrene (3), γ-terpinene (4) and p-mentha-1,3,8-triene (2) leads to p-cymene (5) and p-cymenene (6), respectively. The mechanism of this aromatization reaction will be discussed in this paper.
- Spraul, Martin H.,Nitz, Siegfried,Drawert, Friedrich
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p. 3037 - 3044
(2007/10/02)
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- OXYGENATED DERIVATIVES OF MENTHATRIENE IN PARSLEY LEAVES
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The analysis of aroma volatiles of parsley revealed the presence of two novel oxygenated p-mentha-1,3,8-tiene derivatives, the amounts of which increase during processing of plant material and deteriorate the typical fresh aroma.The two derivatives, which could be synthesized by means of a dye sensitized photooxygenation reaction, were identified as 1-methyl-4(methylethenyl)-2,3-dioxabicyclooct-5-ene and 4-methyl-7-(methylethenyl)-3,8-dioxatricyclo2-4>octane.Key Word Index - Petroselinum crispum; Umbelliferae; parsley; aroma volatiles; p-mentha-1,3,8-triene; dioxetane; 1-methyl-4-(methylethenyl)-2,3-dioxabicyclooct-5-ene; diepoxide; 4-methyl-7-(methylethenyl)-3,8-dioxatricyclo2-4>octane.
- Nitz, Siegfried,Kollmannsberger, Hubert,Spraul, Martin H.,Drawert, Friedrich
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p. 3051 - 3054
(2007/10/02)
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