79186-92-8Relevant academic research and scientific papers
Photochemical reactions of P-mentha-13,8-triene and structural related P-menthadienes
Spraul, Martin H.,Nitz, Siegfried,Drawert, Friedrich
, p. 3037 - 3044 (2007/10/02)
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.
Metal Catalysis in Organic Reactions. Part 13. The Reaction of 3-En-1-ynes with Trialkylalanes: Influence of Transition-metal Complexes
Caporusso, Anna Maria,Giacomelly, Giampaolo,Lardicci, Luciano
, p. 1900 - 1908 (2007/10/02)
The reaction between trialkylalanes and 3-alkyl-, or 4-alkyl-, or 3,4-dialkyl-but-3-en-1-ynes (1) lead to products which correspond to metallation, reduction, and carbalumination processes.The extent of such reactions, and the regio- and stereo-selectivity of the carbalumination, are dependent on the enyne used.A mechanism is proposed involving tautomeric equilibria among several α-unsaturated organoaluminium intermediates to explain the formation of the carbalumination products. In the presence of catalytic amounts of nickel and manganese complexes, 3-en-1-ynes (1), by reacting with tri-isobutylaluminium, are dimerized selectively in a 'head-to-tail' fashion to conjugated tetraenes having different structures in relation to the different nature of the transition-metal complex.The preparative aspect of these induced reactions is discussed, and, in the light of previous reports, some mechanistic considerations are presented.
