74888-95-2Relevant academic research and scientific papers
Co-oligomerization of Butadiene and Carbon Dioxide Catalysed by Tertiary Phosphine-Palladium Complexes
Musco, Alfredo
, p. 693 - 698 (2007/10/02)
Tertiary phosphine-palladium complexes catalyse the co-oligomerization reaction of butadiene and carbon dioxide under mild conditions of temperature and pressure (70 deg C, 100 atm) to yield (E)-2-ethylidenehept-6-en-5-olide (2) and octadienyl esters of (E)-2-ethylidenehepta-4,6-dienoic acid (3b,c) and of 2-vinylhepta-4,6-dienoic acid (4b,c).At higher temperature (90 deg C) esters (3b,c) yield octa-1,3,7-triene and (E)-2-ethylidenehepta-4,6-dienoic acid through an oxidative addition of the allyl carbon-oxygen bond to a palladium(0) species.Subsequent reactions of the carboxylic acid in the presence of n> (L = tertiary phosphine) complexes yield (E)-2-ethylidenehept-5-en-4-olide (1) and 2-ethylhepta-2,4-dien-4-olide (5).
