o-Nitrobenzaldehyde is produced by treating an o-nitrophenyl pyruvate precursor compound with an oxidizing agent and recovering o-nitrobenzaldehyde from the mixture obtained: the precursor compound is an alkyl ester of o-nitrophenyl pyruvic acid in the form of the enol salt or enol ester having the formula
in which R1 is a C1-C4 alkyl group and X is the monovalent residue of an alkali metal atom, an alkaline earth metal atom, or of aluminum, or an acyl group of the formula -C(O)R2, in which R2 is hydrogen or a C1-C3 alkyl group; the oxidizing agent is hydrogen peroxide.
Lichtempfindliche Gemische aus einem Polymeren und einer photoaktiven Komponente erfüllen dan die an Photoresists gestellten Anforderungen im Hohen Maße, wenn das Polymere Carbonsäureanhydrid- oder phenolische Hydroxylgruppen aufweist und die photoaktive Komponente ein N-alkyliertes bzw. -aryliertes 1.4-Dihydropyridin oder 1.4-Dihydropyridinderivat folgender Struktur ist:
wobei der Rest R ein (substituierter) Arylrest ist, der in ortho-Stellung zur Bindung zum Dihydropyridinring eine NO₂-Gruppe trägt, und R³ Alkyl, Cyclohexyl oder Phenyl bedeutet.
如果聚合物具有羧酸酐或酚羟基,而光活性成分是 N-烷基化或芳基化的 1,4-二氢吡啶或 1,4-二氢吡啶衍生物,那么聚合物和光活性成分的光敏混合物就能很好地满足对光刻胶的要求:
其中自由基 R 是(取代的)芳基,在二氢吡啶环键的正交位置上带有 NO₂ 基团,R³ 是烷基、环己基或苯基。
Topical nifedipine formulations and uses thereof
申请人:University of Saskatchewan
公开号:US10543202B2
公开(公告)日:2020-01-28
The present application relates to topical formulations in the form of an oil-in-water emulsion comprising nifedipine and a photostabilizing effective amount of quercetin or a photostabilizing effective amount of a combination of quercetin and butyl methoxydibenzoylmethane (BMDBM). Such topical formulations may, for example, be used for the treatment of diseases, disorders or conditions that benefit from topical administration of nifedipine such as but not limited to Raynaud phenomenon, chilblains or wound healing.
Developing solution and method of forming polyimide pattern by using the developing solution
申请人:Yoshiaki Kawamonzen
公开号:US20010006767A1
公开(公告)日:2001-07-05
Disclosed is a developing solution for a photosensitive polyimide, which consists of an aqueous solution of an amine compound having a base dissociation index pKb [=−log (Kb)=−log (Kw/Ka)=14−pKa, where Kb is a base dissociation constant, Ka is acid dissociation constant of a proton complex, pKa is an acid dissociation index of a proton complex=−log (Ka), and Kw is an ion product of water=1×10
−14
] of 5 to 8 within an aqueous solution of 25° C.