Peter I. Tattersall, D. Breslin, Scott M. Grayson
Apr 8, 2004
Citations
0
Influential Citations
18
Citations
Journal
Chemistry of Materials
Abstract
3-Diazopiperi-2,4-diones have been prepared and explored as photoactive substrates for microlithography. Michael addition of primary amines to methyl acrylate, followed by amidation with methyl malonate yielded amides that underwent base-catalyzed cyclization to the corresponding piperi-2,4-diones. The pendant esters of the resultant piperidiones were removed by hydrolysis and decarboxylation and diazotization was carried out by treatment with tosyl azide. The resulting 3-diazopiperi-2,4-diones absorb in the 240−260-nm spectral range, are readily soluble in common solvents, and undergo the Wolff rearrangement with high quantum yield upon exposure in the deep ultraviolet (DUV) (248−257 nm), affording ketenes that react with adventitious water to provide transparent, base soluble photoproducts. These characteristics make them ideal chromophores for the design of nonchemically amplified photoresists for use in the DUV. Bis-diazopiperidione derivatives prepared from 4,8-bis(chlorosulfonylmethyl)tricyclo[5.2.1...