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 Morewebsite:http://www.gbxfsilicones.com/
Contact:86-25-68900673
Address:He Country Provincial Fine Chemical Industrial Park of Chaohu city,Anhui province,China
Shandong Wanda Organosilicon New Material Co., Ltd
Contact:+86-21-54177116;54302881
Address:R1318 Greenland No. 3 Lane 58 Xinjian East Rd., Minhang
website:http://www.tbbmed.com
Contact:86--21-50498136
Address:Room 6002, Building 7-1, No.160 Basheng Road,Pudong Area,Shanghai China
Zhejiang Haizhou Pharmaceutical Co., Ltd.
website:https://www.haizhoupharma.com/
Contact:+86-576-88221016
Address:No. 19, Donghai 5th Avenue, Yanhai Industrial Zone, Linhai, Zhejiang, China
Hangzhou Haiqiang Chemical Co.,Ltd.
Contact:+86-571-86960370
Address:Add: 5/F, Around Town North Road,No. 10, Hangzhou, Zhejiang,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)