2-Pyridylnitrene and 3-Pyridazylcarbene and Their Relationship via Ring-Expansion, Ring-Opening, Ring-Contraction, and Fragmentation
作者:David Kvaskoff、Pawel Bednarek、Curt Wentrup
DOI:10.1021/jo902570d
日期:2010.3.5
photolysis. Nitrenes 19 and 23 were detected by ESR spectroscopy, and cumulene 21 by IR and UV spectroscopy. FVT of 22T/22A also affords 2-pyridylnitrene 19 and diazacycloheptatetraene 21, as well as glutacononitriles 27Z,E and 2- and 3-cyanopyrroles 28 and 29. Photolysis of 21 above 300 nm yields the novel spiroazirene 25, identified by its matrix IR spectrum. The reaction pathways connecting the four
通过红外光谱检测,在Ar基质中分离的三唑并[1,5- b ]哒嗪8发生光解,生成重氮甲基哒嗪9Z和9E以及重氮戊烯炔11Z和11E。ESR光谱检测到分别由一个和两个N 2分子的损失形成的3-吡啶基卡宾10以及戊-2-烯-3-炔-1-亚基12。进一步的光解作用导致羧甲基重排至1,2-戊二烯-4-炔13和3-乙炔基环丙烯14。闪蒸真空热解(FVT)在400-500°C下为8,并分离出Ar产物13,14,和1,4- pentadiyne 15。在较高温度下,也形成了戊二腈27Z和27E以及少量的2-和3-氰基吡咯28和29。Tetrazolo [1,5- a ]吡啶/ 2-叠氮吡啶22T / 22A产生2-吡啶基硝烯19以及新型的开链氰基二烯基氮杂烯23和环扩环的1,3-二氮杂环庚-1,2,4,6-丁烯21在短波长下光解。氮宾19和23是由ESR光谱,和cumulene检测通过红外和紫外光谱分析21。FVT的22T