摘要:
Inhibition of renal cancer, melanoma, colon cancer, lung cancer and leukemia cells by administration of compounds from the bafilomycin and hygrolidin groups of compounds.
摘要:
The invention provides antibiotics designated LL-E19020 Epsilon and LL-E19020 Epsilon.sub.1 which are derived from the microorganism Streptomyces lydicus ssp. tanzanius NRRL 18036.
摘要:
Cyclohexenone oxime ethers I ##STR1## where R.sup.1 is C.sub.1 -C.sub.6 -alkyl, A is unsubstituted or substituted C.sub.3 -C.sub.6 -alkynylene, Z is unsubstituted or substituted phenyl an unsubstituted or substituted 6-membered or 7-membered saturated or monounsaturated or diunsaturated heterocyclic structure having one or two hetero atoms selected from the group consisting of oxygen and sulfer, and their agriculturally useful salts and esters of C.sub.1 -C.sub.10 -carboxylic acids and inorganic acids, are suitable as herbicides.
摘要:
Pesticidal substituted oxime ethers of the formula ##STR1## in which R represents in each case unsubstituted or substituted alkyl, cycloalkyl, aryl or heterocyclyl andX represents nitrogen or a CH group.
摘要:
Process for the preparation of .alpha.-alkyl lactones by the steps of first reacting an .alpha.-acyl lactone, an aldehyde, and an alkali metal hydroxide together to form an .alpha.-alkylidene lactone, and then hydrogenating the .alpha.-alkylidene lactone.
摘要:
Stabilized aqueous C.sub.14 -C.sub.22 -alkyldiketene emulsions containing, as essential components:(a) from 10 to 60% w/w of at least one C.sub.14 -C.sub.22 -alkyldiketene,(b) from 1 to 10% w/w of at least one protective colloid and(c) from 0.1 to 20% w/w of at least one ester of formula I ##STR1## in which R.sup.1 and R.sup.2 each denote C.sub.14 -C.sub.22 -alkyl, R.sup.1 differing in this case from R.sup.2 by at least 4 carbon atoms in the alkyl chain, and/or the same or different C.sub.14 -C.sub.22 -alkenyl groups, or at least one ester of the formula R.sup.3 --O--CO--O--R.sup.4 (II), in which R.sup.3 and R.sup.4 are alkyl or alkenyl radicals of from 2 to 22 carbon atoms or at least one urethane of formula III ##STR2## in which R.sup.5, R.sup.6 and R.sup.7 are the same or different alkyl or alkenyl radicals of from 2 to 22 carbon atoms and one of the substituents R.sup.5, R.sup.6 and R.sup.7 contains at least 12 carbon atoms,and showing a ratio of emulsified components (a):(c) from 200:1 to 1:1 and the use of compounds of formulae I to III as stabilizers for the preparation of alkyldiketene emulsions containing at least 10% w/w and preferably from 16 to 40% w/w of emulsified alkyldiketene.
摘要:
A method for converting 1,4 and 1,5 aliphatic saturated diols to lactones is disclosed wherein the diol is reacted with a chemical oxidizing agent and a ruthenium containing catalyst at temperatures substantially less than 200.degree. C. The reaction proceeds quickly and produces high yields of the desired product.
摘要:
Tetrahydrofuran and optionally gamma-butyrolactone are prepared from at least one of maleic anhydride or succinic anhydride in the absence of alcohols by catalytically hydrogenating vaporous maleic anhydride or vaporous succinic anhydride in the presence of hydrogen and a catalyst comprising the mixed oxides of copper, zinc and aluminum.
摘要:
A method for producing a lactone by hydrogenating a dicarboxylic acid, a dicarboxylic acid anhydride and/or a dicarboxylic acid ester in the presence of a catalyst, wherein said catalyst is a ruthenium catalyst comprising (1) ruthenium, (2) an organic phosphine and (3) a conjugate base of an acid having a pKa of less than 2.
摘要:
The polymer portion in the production of diketene by the dimerization of ketene obtained from acetic acid by pyrolysis is reduced by the addition of sulfur dioxide to the ketene gas or to the reaction medium.