Resists sensitive to UV, electron beam and x-ray radiation with positive or negative tone upon proper choice of a developer are formulated from a polymer having recurrent pendant groups such as tert-butyl ester or tert-butyl carbonates that undergo efficient acidolysis with concomitant changes in polarity (solubility) together with a photoinitiator which generates acid upon radiolysis. A sensitizer component that alters wavelength sensitivity may also be added.
对紫外线、电子束和 X 射线辐射敏感的抗蚀剂在适当选择显影剂后可产生正或负的色调,这种抗蚀剂是由一种具有重复悬垂基团(如叔丁酯或叔丁基碳酸酯)的聚合物与一种在辐射分解时产生酸的光引发剂配制而成。此外,还可添加一种可改变波长敏感性的敏化剂成分。
Solvent-Free Methallylboration of Ketones Accelerated by <i>tert</i>-Alcohols
作者:Yongda Zhang、Ning Li、Navneet Goyal、Guisheng Li、Heewon Lee、Bruce Z. Lu、Chris H. Senanayake
DOI:10.1021/jo4006574
日期:2013.6.7
A solvent- and metal-free process has been developed for the direct methallylboration of ketones employing the stable B-methallylborinane 1, which was accelerated by tertiary alcohols. In the presence of 2.0 equiv of readily available tertiary alcohols such as tert-amyl alcohol, the methallylation products were prepared at room temperature in excellent yields. The salient features of the described process include simple operation, high efficiency, and mild reaction conditions.
Houlihan, F.; Bouchard, J.; Frechet, J. M. J., Canadian Journal of Chemistry, 1985, vol. 63, p. 153 - 162
作者:Houlihan, F.、Bouchard, J.、Frechet, J. M. J.、Willson, C. G.
DOI:——
日期:——
MgBr<sub>2</sub> · OEt<sub>2</sub>: A Lewis Acid Catalyst for the <i>O</i>- and <i>N</i>-Boc Protection of Phenols and Amines
作者:Aaron Schechter、David Goldrich、Jessica R. Chapman、Beatrix M. Uberheide、Daniel Lim
DOI:10.1080/00397911.2014.976348
日期:2015.3.4
MgBr2 center dot OEt2 efficiently catalyzes the O- and N-tert-butoxycarbonylation of functionalized phenols and amines. The presented procedure is operationally simple and done under solvent-free conditions.