Fluoroalkyl-Substituted Diazomethanes and Their Application in a General Synthesis of Pyrazoles and Pyrazolines
作者:Lucas Mertens、Katharina J. Hock、Rene M. Koenigs
DOI:10.1002/chem.201601707
日期:2016.7.4
A novel continuous‐flow approach for the synthesis of fluoroalkyl‐substituted diazomethanes has been developed. Utilizing a cheap, self‐made microreactor fluoroalkyl‐substituted amines were transformed into the corresponding diazomethanes using tert‐butyl nitrite and acetic acid as catalyst. These diazomethanes were employed in [2+3] cycloaddition reactions with olefins and alkynes, yielding valuable
Use of a Traceless Activating and Directing Group for the Construction of Trifluoromethylpyrazoles: One-Pot Transformation of Nitroolefins and Trifluorodiazoethane
作者:Zhen Chen、Yan Zheng、Jun-An Ma
DOI:10.1002/anie.201700955
日期:2017.4.10
We disclose an efficient one‐pot transformation of trifluorodiazoethane and higher perfluorinated homologues with various nitroolefins. This method takes advantage of the nitro group as a traceless activating and directing group (TADG) that is released in the aromatization step to produce 4‐substituted 3‐perfluoroalkyl pyrazoles with complete regioselectivity. The potential of this method is further
Water-Promoted Ir-Catalyzed Ring-Opening of Oxa(aza)benzonorbornadienes with Fluoroalkylamines
作者:Xin Yang、Wen Yang、Yongqi Yao、Yingying Deng、Xiongjun Zuo、Dingqiao Yang
DOI:10.1021/acs.joc.8b01396
日期:2018.9.7
effective water-promoted iridium-catalyzed ring-opening reaction of oxa(aza)benzonorbornadienes with fluoroalkylamines was developed for the synthesis of fluorinated trans-1,2-amino alcohol or diamine derivatives. Tetrabutylammonium iodide (TBAI) was necessary as an additive for excellent yields in the presence of [Ir(COD)Cl]2 catalyst. Fluorinated trans-1,2-amino alcohol or diamine derivatives could be
Pyromellitic Diimides: Minimal Cores for High Mobility n-Channel Transistor Semiconductors
作者:Qingdong Zheng、Jia Huang、Amy Sarjeant、Howard E. Katz
DOI:10.1021/ja805746h
日期:2008.11.5
Three pyromellitic diimides were synthesized in high yields by one conventional reaction between pyromelliticdianhydride and various amines. The films made from these pyromellitic diimides derivatives exhibit a mobility up to 0.079 cm2/(V.s). In addition, the on/off ratios of n-channel devices are as high as 1 000 000.
Effect of side chain length on film structure and electron mobility of core-unsubstituted pyromellitic diimides and enhanced mobility of the dibrominated core using the optimized side chain
作者:Ming-Ling Yeh、Szu-Ying Wang、Josué F. Martínez Hardigree、Vitaly Podzorov、Howard E. Katz
DOI:10.1039/c4tc02611j
日期:——
Film structures and mobilities of pyromellitic diimides (PyDIs) were investigated; perfluorobutylmethyl chain on 3,6-dibromo PyDI showed exceptional packing and mobility.