摘要:
A process for the production of penicllic acid compounds, especially chloromethyl ester of penicillin G, penicillin V or sulbactam by esterification in the presence of a phase transfer catalyst of the general formula (R¹)(R²)(R³) (R⁴)NX (III) wherein R¹, R², R³ and R⁴ are the same or different and each is an alkyl or aralkyl group and X is a hydroxide, chloride, bromide or hydrogensulfate ion.
摘要:
A thermosensitive recording sheet having a thermosensitive color developer layer containing a basic leuco dye and an organic color developer, said layer containing a compound of the formula as a sensitizer.
摘要:
A quinolonecarboxylic acid compound of the formula I wherein R¹ is an alkyl group, a cycloalkyl group, a haloalkyl group, an alkenyl group, mono- or di-alkylamino groups, a phenyl group or a substituted phenyl group by one to three substituents selected from the group consisting of a halogen atom, an alkyl group, an alkoxy group, a hydroxy group, a nitro group or an amino group, R² is a hydrogen atom, an alkyl group, a cycloalkyl group, an acyl group or an alkoxycarbonyl group, R³ is a hydrogen atom, an alkyl group or an aralkyl group, or R² and R³ together with the adjacent nitrogen atom form heterocyclic ring, R⁴ is a hydrogen atom or an alkyl group, R⁵ is a hydrogen atom, an alkyl group, an aralkyl group or an ester residue which is readily hydrolyzable in vivo, X is a hydrogen atom, a halogen atom or an alkyl group, n is integer of 1 to 3, and a salt thereof, and pharmaceutical use thereof. Said compounds exhibit antibacterial activities and are useful for the treatment of various infectious diseases.
摘要:
Novel individual α-form particle crystals of tetrakis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionyloxymethyl]methane and process for its production are disclosed.
摘要:
Phosphite compounds represented by the formula wherein R¹ stands for a tertiary hydrocarbyl group, R² stands for an alkyl group, an aralkyl group which may be substituted, an aryl group or a cycloalkyl group and n stands for 0, 1 or 2. Such compounds possess stabilizing action against organic materials, particularly antioxidant action, and are useful as antioxidants for preventing deterioration by oxidation of organic materials.
摘要:
Benzolactam compounds of the general formula or isomers thereof as well as salts thereof inclusive of hydrates and/or solvates forms thereof, and benzolactam compounds of the general formula wherein each of the symbols is as defined in the specification. The compound (I) exhibit antiamnesic activity, and are useful as brain function-improving drugs. The compounds (a) and (b) are useful as an intermediate for said compounds (I).
摘要:
Alkanedicarboxylic ester compounds represented by general formula (I), wherein n represents 0 to 8, and R represents a benzyl group or a C1-8 alkyl group. These compounds have a pest-repelling effect and a plasticizing effect on thermoplastic polymers, thus being useful as pest-controlling agents and plasticizers.
摘要:
process for preparing tetrakis (3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl)methane by conducting an ester-exchange reaction of an alkyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate with pentaerythritol in the presence of a basic catalyst, which comprises conducting the reaction in the presence of bis (2,2,2-tris(hydroxymethyl)-ethoxy)-methane. This process enables highly pure tetrakis-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl)methane to be prepared in a good yield without the necessity of using a large amount of expensive alkyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate while yielding a reduced amount of by-products.