通过SPME-GC / MS分析了两个真实的Triatominae亚科的臭虫,巴西的Triatoma brasiliensis和Triatoma infestans的后胸骨挥发物。发现了两组新的天然产物:(4 S,5 S)-和(4 R,5 R)-2,2,2,4-三乙基-5-甲基-1,3-二氧戊环(1)(主要成分)和(4 S *,5 S *)-2,4-二乙基-2,5-二甲基-1,3-二氧戊环(2)(痕量组分),(2 R / S,4 S,5 S)-以及(2 R / S,4 R,5 R)-4-乙基-5-甲基-2-(1-甲基乙基)-1,3-二氧戊环(3)(次要成分),(2 R / S,4 S *,5 S *)-4 -乙基-5-甲基-2-(1-甲基丙基)-1,3-二氧戊环(4)(痕量组分)和(2 R / S,4 S *,5 S *)-4-乙基-5-甲基-2-(2-甲基丙基)-1,3-二氧戊环(5)(
Preparation of Di- and polynitrates by ring-opening nitration of epoxides by dinitrogen pentoxide (N2O5)
作者:Peter Golding、Ross W Millar、Norman C Paul、David H Richards
DOI:10.1016/s0040-4020(01)87978-3
日期:1993.8
hydrocarbon solvents (principally CH2Cl2) to give vicinal nitrate ester products by a novel ring-opening nitrationreaction. The procedure offers easier temperature control and simpler isolation procedures compared with conventional mixed acid nitrations; it also enables selective nitrationreactions to be carried out on polyfunctional substrates. The scope and limitations of the reaction, as well as
通过新颖的开环硝化反应,使十八种各种环氧化合物与N 2 O 5在氯化烃溶剂(主要为CH 2 Cl 2)中反应,得到邻位硝酸酯产物。与传统的混合酸硝化方法相比,该方法提供了更轻松的温度控制和更简单的分离步骤。它还可以在多官能底物上进行选择性硝化反应。讨论了反应的范围和局限性,以及利用N 2 O 4与硝酸亚硝酸酯原位进行原位氧化的替代方法的范围和局限性。
The mechanism of ozone-alkene reactions in the gas phase. A mass spectrometric study of the reactions of eight linear and branched-chain alkenes
作者:Richard I. Martinez、John T. Herron、Robert E. Huie
DOI:10.1021/ja00403a031
日期:1981.7
The stable products of the low-pressure (4-8 torr (1 torr = 133.33 Pa)) gas-phase reactions of ozone with ethene, propene, 2-methylpropene, cis-2-butene, trans-2-butene, trans-2-pentene, 2,3-dimethyl-2-butene, and 2-ethyl- 1 -butene have been identified by using a photoionization mass spectrometer coupled to a stirred-flow reactor. The products observed are characteristic of (i) a primary Criegee split