摘要:
New cephalosporin derivatives of the formula: ##STR1## in which either (a) R.sub.1 is hydrogen, acetoxy, azido or heterocyclylthio or heterocyclylcarbonylthio which is (1,3,4-thiadiazol-2-yl)-thio which is unsubstituted or substituted by straight or branched chain C.sub.1-4 alkyl or alkoxy, straight or branched chain C.sub.1-4 alkylthio, straight or branched chain C.sub.1-4 alkylsulphonyl, amino or acetylamino; (1,2,3,4-tetrazol-5-yl)-thio which is unsubstituted or substituted in the 1-position by straight or branched chain C.sub.1-4 alkyl, hydroxy straight or branched chain C.sub.1-4 alkyl, phenyl or hydroxyphenyl, or in the 2-position by straight or branched chain C.sub.1-4 alkyl or hydroxy straight or branched chain C.sub.1-4 alkyl; (1,2,4-triazol-3-yl)-thio, (4-methyl-1,3-thiazol-2-yl)-thio, (3-methyl-1,2,4-thiadiazol-5-yl)-thio or (1,2,3-thiadiazol-4-yl)-carbonylthio, and R.sub.2 is carboxy or a radical of the formula: ##STR2## in which the radical: ##STR3## is a radical which can be easily removed enzymatically, and in which R.sub.3 is hydrogen or straight or branched chain C.sub.1-4 alkyl and R.sub.4 is straight or branched chain C.sub.1-4 alkyl or cyclohexyl; or (b) R.sub.1 is a pyridinio ion and R.sub.2 is a carboxylato ion, and pharmaceutically acceptable non-toxic metal salts thereof and addition salts thereof with nitrogen containing bases possess valuable anti-bacterial properties, showing activity against both Gram-positive and Gram-negative bacteria.
摘要:
Implantable surgical articles are provided which are at least partially bioresorbable and which consist at least partially of a copolyester of succinic acid and oxalic acid possessing receiving units of the general formulae: ##STR1## in which each R radical in the chain, which may be identical or different, represents a linear or branched alkylene radical possessing 2 to 6 carbon atoms, at least 2 of which carbon atoms form part of the polymer chain, a cyclo-alkylene radical possessing 5 to 8 carbon atoms, or a radical of the general formula: ##STR2## in which each of R.sub.1 and R.sub.2, which may be identical or different, represents a methylene or ethylene radical. They are particularly suitable as sutures.
摘要:
New cephalosporin compounds of the formula: ##STR1## in which A is oxygen or sulphur, R.sub.1 is hydrogen or acetoxy and R.sub.2 is carboxy or a radical of the formula: ##STR2## in which the radical ##STR3## is a radical which can be easily removed enzymatically, and in which R.sub.3 is hydrogen or straight or branched chain C.sub.1-4 alkyl and R.sub.4 is straight or branched chain C.sub.1-4, alkyl or cyclohexyl, together with its diastereoisomeric forms and mixtures thereof, its acid addition salts and, where appropriate, its pharmaceutically acceptable non-toxic metal salts and addition salts with nitrogen-containing bases other than ammonia, exhibit valuable anti-bacterial properties, in particular against Gram-positive and Gram-negative bacteria.
摘要:
The rate of palladium catalyzed deperoxidation of cyclohexyl hydroperoxide to form hex-2-enal is increased by carrying out the deperoxidation using an aqueous solution containing both a palladium derivative and a derivative of divalent iron.
摘要:
1,4-Oxathiino[2,3-c]pyrrole derivatives of the formula: ##STR1## wherein A represents a phenyl, 2-pyridyl, 3-pyridazinyl, 2-quinolyl or naphthyridinyl radical, or a said radical substituted by one or two atoms or radicals selected from halogen, alkyl of 1 through 4 carbon atoms, alkoxy of 1 through 4 carbon atoms and nitro, and R represents alkyl of 1 through 4 carbon atoms, cycloalkyl of 3 through 6 carbon atoms, alkenyl of 2 through 4 carbon atoms or alkynyl of 2 through 4 carbon atoms, possess pharmacological properties, and are especially useful as tranquillizers, anti-convulsant agents, decontracturants, and agents to produce hypnosis.
摘要:
Liquid dielectric compositions useful as electrical insulators are comprised of [1] a liquid dielectric component of known type, in combination with [2] at least one member selected from the group consisting of monocyanophenoxybenzene, monocyanodiphenyl and monocyanoterphenyl.
摘要:
Organosilicon compositions which impart good and immediate non-stick properties to cellulosic and synthetic materials are provided comprising a mixture of dimethylpolysiloxane polymer, a catalyst, an epoxy silane, a crosslinking system and organic solvent, the crosslinking system comprising 70 to 95% of at least one organosilicon compound possessing at least 3 acyloxy groups bonded to one or more silicon atoms, which is a silane of the formula RSi(OCOR").sub.3, a disilane, a disiloxane or a disilylalkane of the formula (R"COO).sub.3.sub.-d.sub.' R.sub.d.sub.' Si(X).sub.f SiR.sub.d (OCOR").sub.3.sub.-d, in which R and R" are as defined above, X represents an oxygen atom or the alkylene radical --(CH.sub.2).sub.h --, each of d and d', which may be identical or different, represents zero, 1 or 2, the sum d + d' being 2 or 3, f represents zero or 1 and h represents 2 or 4, and 2) 5 to 30% of at least one hexaalkoxymethylmelamine, the alkoxy groups each having 1 to 4 carbon atoms.
摘要:
Pseudoplastic aqueous suspensions are provided having good storage stability. These suspensions are of a prepolymer powder prepared fromA. a imide group-containing compound chosen from the group consisting of:A. a bis-imide of the formula: ##STR1## in which D represents a divalent radical which has the formula: ##STR2## wherein Y represents H, CH.sub.3 or Cl and m is equal to 0 or 1, and A represents a divalent organic radical containing 2 to 30 carbon atoms, andB. a mixture of a bis-imide of formula (I) and a mono-imide of the formula: ##STR3## in which D is as defined above and R represents a hydrogen atom or a monovalent organic radical containing 1 to 20 carbon atoms, andB. an amino compound chosen from the group consisting of:A. one or more polyamines containing 2 to 5 primary or secondary amino groups, at least one of these groups being primary,B. a mixture comprising one or more polyamines as defined under a) and one or more primary and/or secondary monoamines and/or one or more secondary polyamines, andC. a polyamine of the general formula: ##STR4## in which x represents a number from 0.1 to 2 and R' represents a divalent hydrocarbon radical with 1 to 8 carbon atoms,The suspension also comprising, based on the weight of the powder, 0.01 to 8% by weight of a heteropolysaccharide of very high molecular weight.
摘要:
A method of obtaining a micro-porous membrane is provided as well as the improved membrane. Said method is characterized in that a homogeneous paste is prepared from a pore-forming filler substance and a latex, and said paste, which is reduced to powder form, is dried and a membrane is formed therefrom and then (fritted) sintered, and the pore-forming filler substance is then removed. The membrane thus obtained is particularly useful as a diaphragm for electrolysis cells.
摘要:
A suspension of a maleamic acid is provided by reacting maleic anhydride with an appropriate diprimary diamine in an organic diluent in the presence of a tertiary amine. The suspension has a low viscosity and the maleamic acid can readily be recovered from it.