of PDMAEMA block reduce the counterion to zerovalent gold in situ, and these gold atoms combine mutually to form final GNPs. GNPs with relatively small size and narrow size distribution can be obtained in longer DMAEMA blockcopolymer, larger molar ratio of DMAEMA to HAuCl4 and smaller absolute concentrations of both polymer and HAuCl4. These results showed that the unimolecularmicelles can be used
A retro-Diels-Alder approach to oxazoles and imidazoles
作者:Michael A. Eissenstat、John D. Weaver
DOI:10.1021/jo00064a029
日期:1993.6
Heating N-acyl derivatives 4 of 3-endo-aminobicyclo[2.2.1]hept-5-en-2-endo-ol (3) at 185-195-degrees-C for 4-5 h provides oxazoles 1a-e in 49-88 % yields. The reaction proceeds via initial dehydration to an oxazoline which undergoes retro-Diels-Alder reaction to provide the oxazole. Similarly, imidazoles 7a-f may be obtained in 40-79 % yields by heating imidazolines 6a-f to effect the cycloreversion.
Eissenstat Michael A., Weaver John D. (III), J. Org. Chem., 58 (1993) N 12, S 3387-3390
作者:Eissenstat Michael A., Weaver John D. (III)
DOI:——
日期:——
PEG-N<sub>2</sub>O<sub>4</sub>System as an Efficient Reagent both for the Rapid Oxidation of Urazoles and 1,4-Dihydropyridines under Nonaqueous Conditions
作者:Mohammad Ali Zolfigol、Ezat Ghaemi、Elaheh Madrakian、Khodabakhsh Niknam
DOI:10.1002/jccs.200800106
日期:2008.6
impregnated on polyethyleneglycol to give a stable reagent. Polyethyleneglycol-N2O4 (PEG-N2O4) system was used as an effective oxidizing agent for the oxidation of urazoles and bis-urazoles to their corresponding triazolinediones and also for the aromatization of 1,4-dihydropyridines into the corresponding pyridine derivatives under mild conditions at room temperature with good to excellent yields.
Poly(2-oxazoline)s (POx) bottle-brush brushes have excellent biocompatible and lubricious properties, which are promising for the functionalization of surfaces for biomedical devices. Herein, a facile synthesis of POx is reported which is based bottle-brush brushes (BBBs) on solid substrates. Initially, backbone brushes of poly(2-isopropenyl-2-oxazoline) (PIPOx) were fabricated via surface initiated