Attempted Isolation and Characterization of Diazirinone (N<sub>2</sub>CO)
作者:Christopher J. Shaffer、Brian J. Esselman、Robert J. McMahon、John F. Stanton、R. Claude Woods
DOI:10.1021/jo9026462
日期:2010.3.19
intrigued by the report of the synthesis of diazirinone (1), a metastable adduct of N2 and CO, we carried out further experimental and theoretical studies aimed at the detailed spectroscopic characterization of this species. Our attempts to generate and detect diazirinone (1) in either the condensed phase (using matrix isolation spectroscopy) or in the gas phase (using millimeter-wave rotational spectroscopy)
刺激且对diazirinone(合成的报告感兴趣1)中,N亚加合物2和CO,我们进行了进一步的实验,目的是该物种的详细光谱表征的理论研究。然而,我们在冷凝相(使用基质分离光谱法)或气相(使用毫米波旋转光谱法)中生成和检测重氮醌(1)的尝试均未成功。在基质分离条件下,将3-氯-3-(对硝基苯氧基)重氮嗪(5)与氟化四丁基铵(TBAF)反应产生的挥发性产物捕集,得到氯氟重氮(8)和一氧化碳,但无法提供重氮酮(1)的证据。此外,对二氮杂醌(1)的结构和基本振动频率进行的复杂的从头计算,可以得出C═O拉伸基带(2046 cm -1)的基带起源的估计值。频率比以前归因于该频带的实验值低100 cm -1。在此理论水平上,这种差异远远超出任何预期的溶剂偏移或计算误差。为了使我们的发现与早先有关二嗪酮的报道(1),我们重新考虑了红外光谱证据,即合成二氮杂醌的原始主张所依据的证据。新的实验表明,这些光谱可
Unprecedented Chemistry of an Aryloxychlorodiazirine: Generation of a Dihalodiazirine and Diazirinone
作者:Robert A. Moss、Gaosheng Chu、Ronald R. Sauers
DOI:10.1021/ja050103n
日期:2005.3.1
The reaction of p-nitrophenoxychlorodiazirine with tetrabutylammonium fluoride follows three channels: (1) approximately 17% of p-nitrophenoxide/fluoride exchange to chlorofluorodiazirine and p-nitrophenol, (2) approximately 28% of Cl/F exchange to p-nitrophenoxyfluorodiazirine, and (3) approximately 55% of ipso fluoride attack, affording p-nitrofluorobenzene and the previously unknown diazirinone (diazacyclopropenone).
Enthalpy versus Entropy in Chlorocarbene/Alkene Addition Reactions
作者:Robert A. Moss、Lei Wang、Min Zhang、Christopher Skalit、Karsten Krogh-Jespersen
DOI:10.1021/ja8005226
日期:2008.4.1
We report the first measured activation parameters for the additions of CCl2 and CClF to simple alkenes and demonstrate the existence of enthalpic barriers for CCl2 additions to cyclohexene and 1-hexene. With these two alkenes, additions of PhCCl are "dominated" by entropic contributions to deltaG++ and additions of CCl2 display comparable contributions of deltaH++ and deltaS++, while CClF additions
Chlorofluorocarbene: First UV Observation of a Dihalocarbene in Solution
作者:Robert A. Moss、Jingzhi Tian、Ronald R. Sauers、Christopher Skalit、Karsten Krogh-Jespersen
DOI:10.1021/ol701804m
日期:2007.9.1
Chlorofluorocarbene (ClCF), generated by laser flash photolysis of chlorofluorodiazirine, absorbs at 368 nm in pentane. Absolute rate constants are reported for ClCF additions to several alkenes and pyridine. ClCF is less reactive toward alkenes than CCl(2), and it does not react rapidly with oxygen. Pertinent computational studies are included.