Oxidative nitration of mononitroalkanes in a system sodium nitrite-polyhaloalkane
摘要:
In reaction of nitroethane lithium salt with sodium nitrite in DMSO, DMF or HMPA involving polyhaloalkanes 1,1-dinitroethane formed in a high yield. The highest yield was obtained with bromo-and iododerivatives. The reaction fits to a kinetic equation of over all second order: the first with respect to the nitroethane anion, and the first in polyhaloalkane. The rate constants of the process are linearly dependent on the electron affinities of the perhaloalkanes molecules.
Electron-transfer substitution reactions: Facilitation by the cyano group
作者:Nathan Kornblum、Michael J. Fifolt
DOI:10.1016/0040-4020(89)80129-2
日期:1989.1
It is now clear that a cyane group facilitate electron-transfersubstitutionreactions. of particular interest is the demonstration that electron-transfer chain substitution at a staturated carbon atom has been achieved in the absence of a nitro group.
[3,2-a]pyrimidin-5-one (2) is obtained by cyclocondensation of 2-aminothiazole with ethyl 4-chloroacetoacetate. This product was shown to react with various nitronate or malonate anions undermicrowaveirradiation to give potentially bioactive 6-nitro-5H-thiazolo[3,2-a]pyrimidin-5-ones. Extension to other anions centered on S atom allows for the generalization this synthetic procedure.
通过2-氨基噻唑与4-氯乙酰乙酸乙酯的环缩合反应,得到7-氯甲基-6-硝基-5 H-噻唑并[3,2 - a ]嘧啶-5-酮(2)。该产物显示在微波辐射下与各种硝酸根或丙二酸根阴离子反应,可产生具有生物活性的6-硝基-5 H-噻唑并[3,2 - a ]嘧啶-5-酮。扩展到以S原子为中心的其他阴离子可以推广这种合成方法。
Norris, Robert K.; Randles, David, Australian Journal of Chemistry, 1982, vol. 35, # 8, p. 1621 - 1633
作者:Norris, Robert K.、Randles, David
DOI:——
日期:——
Nucleophilic substitution in organomercury halides by a free radical chain process