74142-70-4Relevant academic research and scientific papers
Rhodium-catalysed Synthesis of Substituted Methylene Cyclopentanes
Grigg, Ronald,Mitchell, Thomas R. B.,Ramasubbu, Ashok
, p. 27 - 28 (1980)
4,4-Disubstituted 1,6-dienes are cyclised in good yield by Wilkinson's catalyst , in boiling chloroform, to methylene cyclopentanes.
Palladium- and Rhodium-catalysed Cyclisation of 1,6-, 1,7- and 1,8-Dienes to Cyclopentenes and Methylenecyclopentenes. Crystal Structure of Dichloro(4,4-diacetylhepta-1,6-diene)platinum(II)
Grigg, Ronald,Malone, John F.,Mitchell, Thomas R. B.,Ramasubbu, Asnok,Scott, Ronald M.
, p. 1745 - 1754 (2007/10/02)
Hepta-1,6-dienes disubstituted at C-4 with certain carbonyl-containing groups cyclise, in good yield, to the corresponding 4,4-disubstituted 1,2-dimethylcyclopent-2-enes when treated with a catalytic amount of palladium acetate in chloroform containing hydrogen chloride.Changing the catalyst precursor to chlorotris(triphenylphosphine)rhodium(I) led to the formation of the corresponding 1-methyl-2-methylenecyclopentanes which, in turn, isomerised to 1,2-dimethylcyclopent-1-enes in ethanolic hydrogen chloride containing the rhodium complex.The effect of terminal substitution of the dienes with methyl groups was examined. 1,7- and 1,8-Dienes give rise to mixtures of five-membered ring products.Possible mechanisms for the catalytic processes are discussed.The X-ray crystal structure analysis of dichloro(4,4-diacetylhepta-1,6-diene)platinum(II) is reported.
