Useful synthetic reagents derived from 1-triisopropylsilylpropyne and 1,3-[triisopropylsilyl]propyne, direct, stereoselective synthesis of either or enynes
Enhancing sensing of nitroaromatic vapours by thiophene-based polymer films
作者:G. Nagarjuna、Abhishek Kumar、Akshay Kokil、Kedar G. Jadhav、Serkan Yurt、Jayant Kumar、D. Venkataraman
DOI:10.1039/c1jm12949j
日期:——
Optical sensing, via fluorescence quenching, of nitroaromatic vapours using polythiophenes has received limited attention due to their rather low sensory response. We hypothesized that a dipolar 1,2,3-triazole moiety can enhance the interaction of DNT and TNT with the polymer in thin films and bulky side chains can decrease the chain packing in thin films resulting in enhanced analyte diffusion. Herein we show that thin films of thiophene-based polymers containing 1,2,3-triazole with appropriate alkyl side chains show enhanced fluorescence quenching in the presence of nitroaromatic vapours.
Transition metal control in the reaction of alkyne-substituted phenyl iodides with terminal alkynes: Sonogashira coupling vs cyclic carbopalladation
作者:Filip Teplý、Irena G. Stará、Ivo Starý、Adrian Kollárovič、David Šaman、Pavel Fiedler
DOI:10.1016/s0040-4020(02)01154-7
日期:2002.10
Reaction between terminal alkynes and phenyl iodides bearing a tethered alkyne unit can be effectively controlled by the nature of a transition metal catalyst. Whereas the use of Pd(0)/Cu(I) promotes the expected Sonogashira coupling to give phenyl alkynes, the absence of the copper co-catalyst triggers a palladium-mediated cyclisation providing 1,2-dihydroacenaphthylene, 1H,3H-benzo[de]isochromene