Journal of Organic Chemistry p. 68 - 71 (1987)
Update date:2022-09-26
Topics:
Lambert, Joseph B.
Wang, Gen-tai
Huseland, Dave E.
Takiff, Larry C.
Ring-chain tautomerism has been studied in 2-substituted and 1,3-disubstituted diazolidines.In trifluoroacetic acid, these heterocycles are in equilibrium with the open-chain iminium ion.For materials lacking 2 substitution, 5-10percent of the chain form is present at room temperature.Because of resonance stabilization of the positive charge, 2-aryl-substituted systems have about 30percent of the chain form.All of these ring and chain forms undergo interconversion on the NMR time scale with a free energy of activation of 16 - 18 kcal/mol.
View MoreLianYunGang Chiral Chemical(CHINA) CO.,LTD
Contact:+86-518-83616958 +86-519-82884848
Address:LianYunGang Chemical Industry Park (JiangSu)
Ningbo Distant Chemicals Co.,Ltd
Contact:86-574-27862490,27862438
Address:5F-3,#54 DaShaNi street,Ningbo,CHINA
website:http://www.orchid-chem.com
Contact:+86-571-85395792
Address:607, North Zhongshan Road, Hangzhou 310000 China
Forsman Scientific(Beijing)co.,Ltd.
Contact:+86-10-64646565
Address:Rm No.1301, Building-2, No. A-13 Beiyuan Road, Chaoyang District Beijing, China, PR,
Penglai Qianwei Chemical Co., Ltd.
Contact:86-535-3357802
Address:Shahelu (north), Penglai, Shandong, China
Doi:10.1016/0014-3057(77)90169-0
(1977)Doi:10.1055/s-1998-1867
(1998)Doi:10.1002/jhet.5570380212
(2001)Doi:10.1039/j39690000701
(1969)Doi:10.1021/jo980416j
(1998)Doi:10.1039/a806077k
(1998)
