Wako Pure Chemical Industries, Inc.

Tokyo Tanabe Company, Ltd.

Masami Ishihara

Hiroyoshi Nawa

Yoji Urano

Motoshige Sumino

Atsunori Sano

Hiroshi Ogata

Masahiro Takahashi

Kazuhiro Imai

Tsuneaki Maesawa

Motoaki Tanaka

Shigeaki Imazeki

Tsutomu Miyagawa

Kuniaki Tokuda

Kazuhito Fukasawa

Naoki Katano

Kazuo Maruhashi

Jun Yoshihara

The present invention relates to a heterocycle-containing onium salt useful as, for example, a cationic photopolymerization initiator and an acid generator for a chemically amplified resist, and provides a heterocycle-containing onium salt shown in the specification.

Heterocycle-bearing onium salts

The present invention relates to a heterocycle-containing onium salt useful as, for example, a cationic photopolymerization initiator and an acid generator for a chemically amplified resist, and provides 'a heterocycle-containing onium salt shown in the specification.

The present invention relates to a hybrid type onium salt having an iodonium salt and a sulfonium salt in the molecule, Useful, for example, as a cationic type photopolymerization initiator and an acid generator for a chemically amplified resist and provides a hybrid type onium salt shown by the general formula [1]: and Ris an alkyl group, an alkenyl group, an aryl group or an aralkyl group, which may have a substituent selected from the group consisting of a halogen atom, an alkyl group, a haloalkyl group, an aryl group, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group and an amino group which may be substituted or a group shown by the general formula [2]: and a polymerization initiator or an acid generator, comprising said onium salt.

Hybrid type onium salt

A compound shown by the general formula [1](wherein R, Rand Rare each independently an aromatic hydrocarbon residual group, Yis an anion derived from a carboxylic acid having 3 or more carbon atoms with substituted fluorine atoms, and n is 1 or 2, provided that R, Rand Reach is not a phenyl group having substituents at an ortho and/or a meta position), and a composition consisting of the compound and a diazodisulfone compound are disclosed. Use of the compound or the compound as an acid generator for resists produces the effects of improving the profiles of ultra-fine patterns or diminishing sidewall irregularities in ultra-fine patterns. The compound is also useful as a cationic photopolymerization initiator.

Sulfonium salt compound

A pyrido[1,2-a]pyrimidine derivative which is useful as an antiallergic agent can be produced from a 2-aminopyridine derivative or a hydrazoic acid salt thereof by a one-pot and substantially one-step process.

Process for producing pyrido[1,2-a]pyrimidine derivative

3-Tetrazolylpyrido[1,2-a]pyrimidin-4-one derivatives useful as an antiallergy agent are produced by reacting a cyano derivative of pyrido[1,2-a]pyrimidin-4-one compound with (i) hydrazoic acid, followed by hydrolysis, or with (ii) a salt of hydrazoic acid, reacting the resulting product with an acid or a base, followed by hydrolysis.

Process for producing 3-tetrazolyl pyrido[1,2-a]pyrimidine derivatives

Glycero-phosphatidylcholine is acylated with a higher fatty acid anhydride in the presence of a special organic solvent in the absence of a catalyst.

Novel process for producing phosphatidylcholine derivatives

A .gamma.-L-glutamyl-4-nitroanilide derivative of the formula: ##STR1## wherein R is a lower hydroxyalkyl group, is suitable as a substrate for determining .gamma.-GTP activity.

.gamma.-L-glutamyl-4-nitroanilide derivatives and process for

Disclosure herein is novel oxalic acid ester derivatives represented by the general formula: ##STR1## wherein either one of X and Y represents a nitro group, and the other represents ##STR2## in which R represents a lower alkyl group, and n represents a figure of 1-50. The oxalic acid ester derivatives are useful as chemiluminescent reagents for fluororescent substances.

Growing community of inventors

Kawagoe, Japan

Masami Ishihara