摘要:
A process for the production of high molecular weight .alpha.,.beta.-unsaturated aldehydes by alkylation of the .gamma.-carbon atom of a lower molecular weight .alpha.,.beta.-unsaturated aldehyde with a substituted allyl alcohol which has a chain branching in the 4-position carbon atom or a phenyl radical in the 4-position or of a corresponding allyl alcohol carboxylic ester at elevated temperature in the liquid phase.The products are valuable intermediates for the production of natural substances and odorants.
摘要:
A process for the production of high molecular weight .alpha., .beta.-unsaturated aldehydes by alkylation of the .gamma.-carbon atom of a lower molecular weight .alpha., .beta.-unsaturated aldehyde with a substituted allyl alcohol which has a chain branching in the 3-position carbon atom or a phenyl radical in the 3-position or of a corresponding allyl alcohol carboxylic ester at elevated temperature in the liquid phase.The products are valuable intermediates for the production of natural substances and odorants.
摘要:
Manufacture of high molecular weight unsaturated ketones by reacting allyl alcohols with 1-substituted butadiene-1-alkyl ethers or with 1-substituted butadiene-1-alkyl esters or with substances capable of forming said compounds under the conditions of the reaction, in the presence of acid catalysts at elevated temperatures and in the liquid phase. The resulting unsaturated ketones are precursors or intermediates in the manufacture of a variety of natural dyes such as zeaxanthin, rhodoxanthin and xanthophyll or of odorants such as damascones and damascenones.
摘要:
A process for the production of high molecular weight .alpha.,.beta.-unsaturated aldehydes by alkylation of the .gamma.-carbon atom of a lower molecular weight .alpha.,.beta.-unsaturated aldehyde with a substituted allyl alcohol which has a chain branching in the 3-position carbon atom or a phenyl radical in the 3-position or of a corresponding allyl alcohol carboxylic ester at elevated temperature in the liquid phase.The products are valuable intermediates for the production of natural substances and odorants.
摘要:
A process for the production of .alpha.,.beta.-unsaturated ketones by reaction of an aldehyde with a ketone in the presence of a catalyst consisting essentially of zinc oxide in the liquid phase. The ketones obtained are suitable in some cases as solvents and in some cases as intermediates for the production of valuable odorants, dyes, plastics and especially natural substances.
摘要:
A process for the production of high molecular weight unsaturated ketones by alkylation of low molecular weight .alpha.,.beta.-unsaturated ketones with an allyl alcohol at elevated temperature in the presence of an acid catalyst. The products are intermediates for the production of various natural substances and perfumes such as the damascenones, damascones or natural dyes such as zeaxanthin, rhodoxanthin or xanthophyll.
摘要:
A process for the preparation of 3-(2'-acyloxyethyl)-dihydro-2(3H)furanones of the general formula I ##STR1## in which R.sup.1 denotes C.sub.1 -C.sub.12 alkyl, C.sub.5 -C.sub.8 cycloalkyl, aryl, C.sub.7 -C.sub.12 aralkyl, or C.sub.7 -C.sub.12 alkylaryl, in which a 3-(2'-oxyethyl)-dihydro-2(3H)furanone of the general formula II ##STR2## in which R.sup.2 denotes C.sub.1 -C.sub.12 alkyl, C.sub.5 -C.sub.8 cycloalkyl, aryl, C.sub.7 -C.sub.12 aralkyl, or C.sub.7 -C.sub.12 alkylaryl is caused to react with a carboxylic acid, a carboxylic anhydride, and/or an acyl halide in the presence of an acid catalyst at temperatures of from 50.degree. to 250.degree. C. and pressures of from 0.1 to 100 bar.
摘要:
Ortho-substituted benzyl esters of cyclopropanecarboxylic acids I ##STR1## where X is N or CH and A is one of the following cyclopropane radicals: ##STR2## where R.sup.1 is CN, C.sub.2 -C.sub.8 -alkyl, CF.sub.3, C.sub.3 -C.sub.8 -alkenyl, (C.sub.1 -C.sub.4 -alkoxycarbonyl, unsubstituted or substituted phenyl-C.sub.1 -C.sub.6 -alkyl or phenyl-C.sub.3 -C.sub.6 -alkenyl, ethoxyphenyl, 2- or 3-bromophenyl, 2- or 4-trifluoromethylphenyl, 2,4- or 2,6-difluorophenyl, 2-fluoro-6-chlorophenyl, 2,4- or 2,6-dimethylphenyl, 2,3,6-trichlorophenyl or trimethylsilyl, R.sup.2 is H or halogen, R.sup.3 is unsubstituted or substituted phenyl, R.sup.4 is CH.sub.3 or halogen and Hal is halogen, with the proviso that X is CH when R.sup.1 is CF.sub.3 or trimethylsilyl, are suitable as fungicides and for controlling pests.
摘要:
A process for the preparation of tetrahydropyran-4-carboxylic acid and esters thereof of the general formula I ##STR1## in which R.sup.1 denotes hydrogen, C.sub.1 -C.sub.6 alkyl, C.sub.5 -C.sub.8 cycloalkyl, or aryl by the reaction of a dihydro-2(3H)furanone of the general formula II ##STR2## in which R.sup.2 denotes hydrogen, C.sub.1 -C.sub.6 alkyl, or --CO--R.sup.3 andR.sup.3 denotes hydrogen or C.sub.1 -C.sub.6 alkyl, with water or an alcohol of the general formula IIIR.sup.1 --OH (III),in whichR.sup.1 has the aforementioned meaning,at temperatures ranging from 200.degree. to 350.degree. C. in the presence of a heterogenous acid catalyst, in which use is made of a fixed heterogenous acid catalyst.
摘要:
Pyridine derivatives of the formulae ##STR1## wherein W, X, Y and Z are each C--R.sup.4, N or N.fwdarw.O, with the proviso that the ring contains only one heteroatom, and the substituents R.sup.1, R.sup.2 and R.sup.3 have the following meanings:R.sup.1 is alkoxy, substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted alkenyl, or substituted or unsubstituted alkynyl,R.sup.2 is hydrogen,R.sup.3 is formyl, 4,5-dihydrooxazol-2-yl or --CO--A--R.sup.5 or --CO--NR.sup.6.sup.R.sup.7, whereR.sup.4 is halogen, nitro, cyano, substituted or unsubstituted alkyl, substituted or unsubstituted benzyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted alkynyl, alkoxy, alkylthio, haloalkoxy, haloalkylthio, alkenyloxy, alkynyloxy, alkylsulfinyl, alkylsulfonyl, haloalkylsulfonyl, substituted or unsubstituted phenoxy or phenylthio, a substituted or unsubstituted 5- or 6-membered heterocyclic radical having one or two heteroatoms selected from the group consisting of oxygen, sulfur and nitrogen, or is substituted or unsubstituted phenyl,A is oxygen or sulfur,R.sup.5 is hydrogen, substituted or unsubstituted alkyl, substituted or unsubstituted benzyl, cycloalkyl, substituted or unsubstituted phenyl,one equivalent of a cation or the radical --N.dbd.CR.sup.8 R.sup.9 andR.sup.6 and R.sup.7 are hydrogen or alkyl or together denote a methylene chain having 4 or 5 members,their agriculturally utilizable salts, and their use for controlling unwanted plant growth.