摘要:
.omega.,.omega.-Diacyloxy-2,6-dimethyl-octatrienoates and -octatrienals, as novel bifunctional asymmetric C.sub.10 building blocks for terpene syntheses, which possess a formyl or alkoxycarbonyl group at one chain end and 2 geminal acyloxy groups at the other, and a process for their preparation from readily obtainable industrial C.sub.5 building blocks and their use for the synthesis of terpene compounds by carbonyl olefination under conventional conditions.
摘要:
2-Alkyl-4,4-diacyloxybut-2-enals of the formula ##STR1## where R.sup.1 is alkyl and R.sup.2 and R.sup.3 are each hydrogen or an aliphatic, cycloaliphatic or aromatic radical, are prepared by a process in which a 2-alkyl-1,4-diacyloxybuta-1,3-diene of the formula ##STR2## is reacted with oxygen or an oxygen donor, in the presence of a carboxylic acid of the formulaR.sup.3 -COOH III.
摘要:
2-alkyl-4,4-diacyloxybut-2-enals of the formula ##STR1## where R.sup.1 is alkyl and R.sup.2 and R.sup.3 are each hydrogen or an aliphatic, cycloaliphatic or aromatic radical, are prepared by a process wherein a 2-alkyl-2,4-diacyloxybut-3-enal of the formula ##STR2## is treated with an aliphatic carboxylic acid.
摘要:
2-Alkyl-2,4-diacyloxy-but-3-enals of the formula ##STR1## where R.sup.1 is alkyl and R.sup.2 is hydrogen, alkyl, a cycloaliphatic radical or an aromatic radical, are prepared by reacting a buta-1,3-diene of the formula ##STR2## with an oxygen donor. The new compounds are valuable intermediates in the preparation of terpenes, e.g. retinal, .beta.-carotin and apocarotinoids.
摘要:
3-Alkyl-3-acyloxy-4-hydroxybut-1-enes are prepared by a process in which a 3-alkyl-3,4-epoxybut-1-ene is treated with a carboxylic acid and a copper salt of a carboxylic acid.
摘要:
O-xylene and ethylbenzene are prepared by converting, 2,7-octadien-1-ol, 1,7-octadien-3-ol or mixtures containing these octadienols, or carboxylates of 2,7-octadien-1-ol or of 1,7-octadien-3-ol, or mixtures containing these carboxylates at from 200.degree. to 550.degree. C. over a catalyst.
摘要:
Vinylglycol esters are prepared by reacting butadiene with oxygen and a carboxylic acid in the gas phase or liquid phase over a supported catalyst which contains from 0.1 to 20 percent by weight of palladium and from 2.5 to 7 percent by weight of cobalt.
摘要:
A process for the preparation of a 4-acyloxy-2-methyl-crotonaldehyde of the formula ##STR1## where R is hydrogen or an aliphatic radical of 1 to 5 carbon atoms, by reacting a 1,1,4-triacyloxy-2-methyl-but-2-ene of the formula ##STR2## where R.sup.1 and R.sup.2 are each hydrogen or an aliphatic radical of 1 to 5 carbon atoms, with water in the presence of a carboxylic acid of the formulaR--COOH III.
摘要:
1,4-diacyloxybutenes are prepared by reacting a 1,3-butadiene with a carboxylic acid and oxygen in the presence of a catalyst in a reactor, by a process in which the 3,4-diacyloxybutene formed as a by-product in the reaction is separated off from the reaction mixture, and some or all of this 3,4-diacyloxybutene is recycled to the reactor.
摘要:
A process for the preparation of a diacyloxyhexadiene of the formula ##STR1## where X is R.sup.9 -CO- and R.sup.1 to R.sup.9 are hydrogen or alkyl of 1 to 3 carbon atoms, by reacting a hexatriene of the formula ##STR2## with oxygen and a carboxylic acid of the formula R.sup.9 COOH in the presence of a catalyst which contains palladium, platinum or a salt of these metals.