Patent ID: 6440634
Filing Date: 2002-08-27
Classification: C07C,G03F,Y10S

Abstract:
An onium salt of formula (1): wherein R1 is an unsubstituted, straight, branched or cyclic alkyl group of 1 to 10 carbon atoms, the group an unsubstituted aryl group of 6 to 14 carbon atoms, 4-methylphenyl, 4-ethylphenyl, 4-methoxyphenyl, 4-tert-butylphenyl, 2,4-dimethylphenyl, 2,4,6-trimethylphenyl, or 2,4,6-triisopropylphenyl, R2 which may be the same or different is hydrogen or a an oxo- or hydroxy-substituted or unsubstituted, straight, branched or cyclic alkyl group of 1 to 6 carbon atoms, p is an integer of 1 to 5, q is an integer of 0 to 4, p+q=5, R3 which may be the same or different is a substituted or unsubstituted, straight, branched or cyclic alkyl group of 1 to 10 carbon atoms or substituted or unsubstituted aryl group of 6 to 14 carbon atoms, M is a sulfur or iodine atom, and â€œaâ€  is equal to 3 when M is sulfur and equal to 2 when M is iodine.