A polymer for forming an organic anti-reflective coating layer between an etching layer and a photoresist layer to absorb an exposure light in a photolithography process and a composition comprising the same are disclosed. The polymer for forming an organic anti-reflective coating layer has a repeating unit represented by
wherein, R
1
is hydrogen or methyl group, and R
2
is a substituted or non-substituted alky group of C1 to C5. The composition for forming the organic anti-reflective coating layer includes the polymer having the repeating unit represented by above Formulas; a light absorber; and a solvent.
Oxoammonium Salts. 9. Oxidative Dimerization of Polyfunctional Primary Alcohols to Esters. An Interesting β Oxygen Effect
作者:Nabyl Merbouh、James M. Bobbitt、Christian Brückner
DOI:10.1021/jo049461j
日期:2004.7.1
The use of the oxidant 4-acetylamino-2,2,6,6-tetramethylpiperidine-1-oxoammonium tetrafluoroborate in combination with pyridine for the oxidative, dimeric esterification of primary alcohols is described. The ester is the predominant product of the reaction with alcohols containing a β oxygen. In the absence of a β oxygen, the corresponding aldehyde is found in appreciable amounts, but a concentration