Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 2511 - 2518 (1988)
Update date:2022-08-05
Topics:
Clarke, John K. A.
Hegarty, Bernard F.
Rooney, John J.
Reactions of 1,1,3,3-tetramethylcyclobutane (TMCB)-hydrogen mixtures on evaporated metal films have shown that both ring scission to 2,2,4-trimethylpentane (TMP) and ring enlargement to 1,1,3-trimethylcyclopentane (TMCP) are dominant on sintered platinum films, while ring scission to TMP predominates on sintered palladium and on unsintered molybdenum films.Unsintered tantalum and molybdenum films gave a large production of iC4 hydrocarbon, particularly above ca. 500 K: ring enlargement was a minor reaction found particularly with tantalum.The homogeneous reaction of TMCB giving a large iC4 production sets in at 600 K.The possibility, suggested by the product distribution, that the reaction of TMCB on Mo and Ta is a metal-assisted free-radical reaction is examined.While it may not be completely excluded that the catalysed ring enlargement on Pt and Pd is a free-radical reaction it is argued that only the previously proposed Rooney-Samman bond-shift mechanism accommodates without added qualifications published facts on bond shifts, including those at quaternary carbon atoms, and also ring enlargements.
View MoreShanghai Hongbang Medical Technology CO.,. Ltd
Contact:13671516988 /18917636693
Address:Room1, No67 Building, Yongde Road369, Wujing Town, Minhang Districy, Shanghai CIty, China.
Tianjin Pharmacn Medical Technology Co.,Ltd.
Contact:86-22-60122566ext.866(English),23359620
Address:Green Industrial Base, 6 Haitaifazhan Sixth Rd., Huayuan Industrial Area, Tianjin, 300384, China
Zhangjiagang Golden Reach Fine Chemical Co.,LTD.
Contact:+86-512-6585 6968
Address:Changfu Road， Dongsha Chemical Industry Park, Zhangjiagang City, Jiangsu Province, China
Nanjing Raise Pharmatech Co., Ltd
website:http://www.raisechem.com
Contact:+86-25-58649566
Address:B381,No.606,Ningliu Road,Jiangbei New Area,Nanjing,Jiangsu Province,China
Melone Pharmaceutical Co., ltd
Contact:+86-411 82593920, 82593631
Address:No 232, JInma Roda, Development Zone, Dalian, China
Doi:10.1021/jo01035a521
(1964)Doi:10.1016/j.tet.2017.12.051
(2018)Doi:10.1246/bcsj.71.2365
(1998)Doi:10.1055/s-1998-1865
(1998)Doi:10.1016/S0040-4020(98)00841-2
(1998)Doi:10.1016/S0040-4020(98)00819-9
(1998)
