324740-08-1Relevant articles and documents
Cobalt-Catalyzed Highly Regioselective Three-Component Arylcarboxylation of Acrylate with Aryl Bromides and Carbon Dioxide
Hang, Wei,Liang, Nianjie,Liu, Yuzhou,Xi, Chanjuan
, p. 4941 - 4946 (2021/10/30)
Cobalt-catalyzed regioselective three-component arylcarboxylation of acrylate with aryl bromides and carbon dioxide has been developed. The reaction is carried out by using cobalt chloride as a precatalyst and zinc powder as a reducing reagent under CO2 (1 atm) at 40 °C. A range of aryl bromides are used for this reaction, leading to a series of valuable carboxylic acids with high regioselectivity and functional-group compatibility. Mechanistic experiments and DFT calculations indicate that this arylcarboxylation reaction involves the reaction of CO2 with a cobalt enolate intermediate to form the C?C bond.
Toward environmentally friendly photolithographic materials: A new class of water-soluble photoresists
Yamada, Shintaro,Mrozek, Thomas,Rager, Timo,Owens, Jordan,Rangel, Jose,Willson, C. Grant,Byers, Jeffery
, p. 377 - 384 (2007/10/03)
New water-soluble styrenic polymers bearing two functional groups, pendant ammonium salts of half-esters of malonic acids and acid-labile alkyl esters, were synthesized and evaluated for water-soluble positive-tone photoresist application. These polymers feature two solubility switches: insolubilization of the entire film by baking and selective solubilization upon exposure to UV light. Time-resolved FT-IR measurement of the baked films showed sequential evaporation of ammonia from the films and the decarboxylation of the malonate half-esters. The rates of decarboxylation depend on the structure of substituents at the 2-position of the malonates. The choice of acid-labile esters, the structure of the half-esters, and the polymer compositions were carefully optimized, and high-resolution positive tone images were obtained that were fully processed in aqueous media.
