通过氘标记实验研究了吡唑基-,喹喔啉-和苯并喹喔啉-桶型烯的化学选择性光重排。在直接或敏化条件下,用300 nm区域的光对吡嗪并戊四烯和4和喹喔啉和5进行光解,分别得到半牛缬草7和8。苯并喹喔啉戊烯6对两种反应条件均是惰性的。氘代吡嗪并戊四烯基4- d 4和喹喔啉和戊二烯基5- d 4的辐照可得到氘代半杂戊烯7- d 4 -A - 7- d4 -F和8- d 4 -A - 8- d 4 -F。桥接的两个先验的可能性,氘-标记实验已经表明,氘化pyrazinobarrelene 4- d 4,得到98%的(C 6 d 6)和95%(CD 3通过芳基-乙烯基生成半瞬烯的CN)(A- V)桥接,而喹喔啉和5- d 4分别提供79%(C 6 D 6)和71%(CD 3CN)的半牛戊烯通过乙烯基-乙烯基(V-V)桥接生成。杂芳烃稠合的barrelenes的对比光化学行为4 - 6是在三重态能量最小化
Evaluation of the<i>α</i>-phenylvinyl cation as a chemical ionization reagent for the differentiation of isomeric substituted phenols in an ITMS
作者:Michela Begala
DOI:10.1002/jms.3578
日期:2015.4
Ion–moleculereactions between the α‐phenylvinyl cation and isomeric naturally occurring phenols were investigated using a quadruple ion trap mass spectrometer. The α‐phenylvinyl cation m/z 103, generated by chemicalionization from phenylacetylene, reacts with neutral aromatic compounds to form the characteristic species: [M + 103]+ adduct ions and the trans‐vinylating product ions [M + 25]+, which
Chemoselective Photorearrangements of Diazinobarrelenes. Deuterium Labeling Study
作者:Ann-Cheng Chen、Gary J. Chuang、Nelson R. Villarante、Chun-Chen Liao
DOI:10.1021/jo7016795
日期:2007.12.1
Irradiation of deuterated pyrazinobarrelene 4-d4 and quinoxalinobarrelene 5-d4 afforded deuterated semibullvalenes 7-d4-A−7-d4-F and 8-d4-A−8-d4-F, respectively. Of the two a priori possibilities of bridging, the deuterium-labeling experiment has shown that deuterated pyrazinobarrelene 4-d4 afforded 98% (C6D6) and 95% (CD3CN) of semibullvalenes generated through aryl−vinyl (A−V) bridging, whereas the quinoxalinobarrelene
通过氘标记实验研究了吡唑基-,喹喔啉-和苯并喹喔啉-桶型烯的化学选择性光重排。在直接或敏化条件下,用300 nm区域的光对吡嗪并戊四烯和4和喹喔啉和5进行光解,分别得到半牛缬草7和8。苯并喹喔啉戊烯6对两种反应条件均是惰性的。氘代吡嗪并戊四烯基4- d 4和喹喔啉和戊二烯基5- d 4的辐照可得到氘代半杂戊烯7- d 4 -A - 7- d4 -F和8- d 4 -A - 8- d 4 -F。桥接的两个先验的可能性,氘-标记实验已经表明,氘化pyrazinobarrelene 4- d 4,得到98%的(C 6 d 6)和95%(CD 3通过芳基-乙烯基生成半瞬烯的CN)(A- V)桥接,而喹喔啉和5- d 4分别提供79%(C 6 D 6)和71%(CD 3CN)的半牛戊烯通过乙烯基-乙烯基(V-V)桥接生成。杂芳烃稠合的barrelenes的对比光化学行为4 - 6是在三重态能量最小化
Microwave-assisted deuterium exchange: The convenient preparation of isotopically labelled analogues for stable isotope dilution analysis of volatile wine phenols
作者:Anna M. Crump、Mark A. Sefton、Kerry L. Wilkinson
DOI:10.1016/j.foodchem.2014.04.051
日期:2014.11
This study reports the convenient, low cost, one-step synthesis of labelledanalogues of six volatile phenols, guaiacol, 4-methylguaiacol, 4-ethylguaiacol, 4-ethylphenol, eugenol and vanillin, using microwave-assisted deuterium exchange, for use as internal standards for stable isotope dilution analysis. The current method improves on previous strategies in that it enables incorporation of deuterium