Synthesis and thermochemical study of quinoxaline-N-oxides: enthalpies of dissociation of the N-O bond
作者:Miguel L. F. Viveiros、Vera L. S. Freitas、Nuno Vale、José R. B. Gomes、Paula Gomes、Maria D. M. C. Ribeiro Silva
DOI:10.1002/poc.1932
日期:2012.5
of three new quinoxaline mono‐N‐oxides derivatives, namely, 2‐tert‐butoxycarbonyl‐3‐methylquinoxaline‐N‐oxide, 2‐phenylcarbamoyl‐3‐ethylquinoxaline‐N‐oxide, and 2‐carbamoyl‐3‐methylquinoxaline‐N‐oxide, from their corresponding 1,4‐di‐N‐oxides is reported. Samples of these compounds were used for a thermochemical study, which allowed derivation of their gaseous standard molar enthalpies of formation
三种新的喹喔啉单N氧化物衍生物的合成,即2-叔丁氧基羰基-3-甲基喹喔啉-N-氧化物,2-苯基氨基甲酰基-3-乙基喹喔啉-N-氧化物和2-氨基甲酰基-3-甲基喹喔啉- ñ氧化物,从它们的相应的1,4-二- ñ -oxides报道。这些化合物的样品用于热化学研究,可以从其气态标准摩尔形成焓,其在冷凝相中的形成焓,通过静态炸弹燃烧量热法确定的以及它们的升华焓得出,通过Calvet微量量热法测定。最后,结合对于这项工作中获得的喹喔啉-N-氧化物以及相应的1,4-二-N-氧化物和原子氧的文献值,键解离焓用于裂解二-N-氧化物中的第一个N-O键获得了DH 1(N–O)并将其与现有数据进行比较。版权所有©2011 John Wiley&Sons,Ltd.