Tetrahedron p. 4147 - 4152 (1974)
Update date:2022-09-26
Topics:
Schaumann
Sieveking
Walter
Sulfonylisothiocyanates 1 and β,β-dimethylenamines 2 react to yield the dipoles 3. In nonpolar solvents an equilibrium exists between 3 and the thietanes 4. The free activation enthalpy for the ring closure 3→4 was obtained from the temperature dependent NMR spectra in liquid sulfur dioxide. Protonation of 3 with perchloric acid leads to the salts 8 which, as indicated by ΔG≠-values obtained from NMR spectra, are also capable of ring closure.
View MoreShanghai Sunway Pharmaceutical Technology Co.,Ltd.
Contact:+86-21-5161 3915
Address:Shanghai YangPu
Taizhou Huading Chemical Co.,Ltd(expird)
Contact:+86-576-88583898
Address:Economic&Technology development zone,Taizhou City,Zhejiang Province,China
Zhejiang Sanmei Chemical Industry Co., Ltd
Contact:86-579-87633213
Address:Huchu Industrial Zone, Qingnian Rd., Wuyi County, Zhejiang Prov., China.
Synochem Ingredients Corp., Ltd.
Contact:+86-512-5636 2180
Address:Zhangjiagang Free Trade Zone
Contact:+86-512-56795332
Address:No227 Shuanglong Rd, Fenghuang, Zhangjiagang
Doi:10.1016/j.catcom.2019.05.006
(2019)Doi:10.1021/jo034442f
(2003)Doi:10.1016/0040-4020(75)80168-2
(1975)Doi:10.1055/s-2003-37649
(2003)Doi:10.1021/jm00242a021
(1975)Doi:10.1021/ol0348755
(2003)