摘要:
1,6-Hexanediol is prepared bya) Reacting epoxybutadiene in the presence of a metathesis catalyst with elimination of ethene to give bisepoxyhexatrienes of the formulae Ia and Ib ##STR1## and b) hydrogenating these bisepoxyhexatrienes with hydrogen to give 1,6-hexanediol.
摘要:
A process for preparing tetrahydrofuran, which comprises reacting 1,4-butenediol diethers of the formulae I and/or IIRO--CH.sub.2 --CH.dbd.CH--CH.sub.2 --OR IRO--CH.sub.2 --CH.sub.2 .dbd.CH--CH.sub.2 --OR II,where the R radicals can be identical or different and are C.sub.1 -C.sub.15 -alkyl or cycloalkyl radicals, C.sub.6 -C.sub.12 -aryl radicals or C.sub.7 -C.sub.15 -aralkyl radicals, with water and hydrogen at from 20 to 300.degree. C. under from 1 to 300 bar in the presence of catalysts or catalyst combinations which comprise components which are both capable of hydrogenation and have acidic or basic centers and a novel process for preparing 1,4-butanediol diethers of the formula I by metathesis are described.The invention furthermore relates to the separate preparation of 1,4-butanediol monoethers of the formula IIIHO--CH.sub.2 --CH.sub.2 --CH.sub.2 --CH.sub.2 --OR III,where R has the meanings indicated for formulae I and II, for which purpose 1,4-butanediol diethers of the formulae I and/or II are reacted as claimed in claim 1 with water and hydrogen in the presence of a hydrogenation catalyst at from 20 to 300.degree. C. under from 1 to 300 bar.
摘要:
In a process for the catalytic hydrogenation of 2,5- and 2,3-dihydrofuran with hydrogen to give tetrahydrofuran, use is made of a catalyst in which a metal or a plurality of metals have been deposited by vapor deposition or sputtering on a metal wire mesh or a metal foil as support.
摘要:
1,6-hexanediol and .epsilon.-caprolactone are prepared from a carboxylic acid mixture comprising adipic acid, 6-hydroxycaproic acid and small amounts of 1,4-cyclohexanediols which is obtained as a by-product in the oxidation of cyclohexane to cyclohexanone/cyclohexanol using oxygen or oxygen-containing gases by water extraction of the reaction mixture, by esterifying and hydrogenating a substream to give hexanediol and cyclizing 6-hydroxycaproic esters to give caprolactone.
摘要:
Described is a method of producing 1,4-butanediol, the method calling for 2,3-dihydrofuran to be decomposed in a single stage over a hydrogenation catalyst in the presence of water and hydrogen at a temperature of 20 to 300.degree. C. and a pressure of 1 to 300 bar and in neutral or acid conditions.
摘要:
1,4-butanediol and THF are prepared from furan by a process which comprises converting furan in the presence of water and hydrogen but in the absence of a water-soluble acid in a single stage over a hydrogenation catalyst, the hydrogenation catalyst containing at least one element of subgroup I, V, VI, VII or VIII in the form of a compound or in elemental form and the restriction that the catalyst does not contain nickel alone being applicable.
摘要:
A process for the preparation of cycloalkanols by the hydrolysis of cycloalkyl C.sub.1 -C.sub.4 fatty acid esters, which comprises the following steps:a) reaction of cycloalkyl C.sub.1 -C.sub.4 fatty acid esters with water at a temperature of from 30.degree. to 250.degree. in the liquid phase yielding a reaction mixture consisting of cycloalkyl C.sub.1 -C.sub.4 fatty acid esters, cycloalkanol, C.sub.1 -C.sub.4 fatty acids, and water.b) separation of the reaction mixture obtained in stage a) at a temperature of from 0.degree. to 200.degree. C. into a top phase consisting substantially of cycloalkanol and cycloalkyl C.sub.1 -C.sub.4 fatty acid esters and a bottom phase consisting substantially of water and C.sub.1 -C.sub.4 fatty acids.c) separation of cycloalkanol from the top phase obtained in stage b) by distillation and recycling unconverted cycloalkyl C.sub.1 -C.sub.4 fatty acid esters to stage a).
摘要:
A process for preparing five-membered nitrogen heterocycles of the general formula I ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, R.sup.8 are hydrogen,R.sup.1 is C.sub.1 -C.sub.10 -alkyl, C.sub.1 -C.sub.10 -hydroxyalkyl, C.sub.1 -C.sub.10 -aminoalkyl, aryl, C.sub.7 -C.sub.10 -aralkyl and C.sub.7 -C.sub.10 -alkylaryl,R.sup.5 and R.sup.6 are C.sub.1 -C.sub.8 -alkyl,R.sup.2 and R.sup.3 together are oxygen with the proviso that R.sup.8 is hydrogen,R.sup.3 and R.sup.4 and/or R.sup.7 and R.sup.8 or R.sup.4 and R.sup.7 together are a bond,comprises reacting vinyloxiranes of the general formula II ##STR2## where R.sup.5 and R.sup.6 have the abovementioned meanings, with ammonia or primary amines of the general formula IIIR.sup.1 --NH.sub.2 (III),where R.sup.1 has the abovementioned meanings, in the presence of a compound of an element of Group VIIIb or Ib of the Periodic Table, with or without the addition of a Lewis acid, at from 20.degree. to 200.degree. C. under from 1 to 70 bar, and subsequently cyclizing in the presence of hydrogen and of a hydrogenation catalyst at from 150.degree. to 350.degree. C. under from 0.1 to 300 bar.
摘要:
A process for preparing 5-membered ring heterocycles of the general formula I ##STR1## where R.sup.1 is methyl or hydroxyethyl,R.sup.2,R.sup.3,R.sup.4,R.sup.5 and R.sup.6 are hydrogen, C.sub.1 - to C.sub.12 -alkyl, C.sub.2 - to C.sub.12 -alkenyl, aryl, C.sub.3 - to C.sub.8 -cycloalkyl, C.sub.1 - to C.sub.12 -alkoxy, halogen, C.sub.2 - to C.sub.20 -alkoxycarbonylalkyl, C.sub.2 - to C.sub.20 -alkylcarbonyloxy, formyl, C.sub.2 - to C.sub.20 -formylalkyl, benzoyl or --CH(OR.sup.3)(OR.sup.5), or R.sup.3 and R.sup.5 together are a C.sub.2 - to C.sub.7 -alkylene chain which is unsubstituted or monosubstituted to pentasubstituted by R.sup.4 or a .dbd.CH--CH.dbd.CH--CH.dbd. unit which is unsubstituted or monosubstituted to tetrasubstituted by R.sup.4,X is oxygen or N--R.sup.4by reacting 5-membered ring heterocycles of the general formula II ##STR2## where R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6 and X have the abovementioned meanings and Y is hydrogen, acetyl or C.sub.2 - to C.sub.20 -alkoxycarbonyl, with dimethyl or ethylene carbonate in the presence of a nitrogen-containing base at from 50.degree. to 300.degree. C. and from 0.01 to 50 bar is described.
摘要:
A process for the preparation of 2,6-dimethylmorpholine from N-(2-hydroxypropyl)-2,6-dimethylmorpholine, in which N-(2-hydroxypropyl)-2,6-dimethylmorpholine, in whicha) N-(2-hydroxypropyl)-2,6-dimethylmorpholine is caused to react in the presence of a catalyst containing an element listed in Groups Ib, IIb, and/or VIIIb of the Periodic Table at temperatures ranging from 150.degree. to 600.degree. C. and is then caused to react with water at temperatures ranging from 30.degree. to 300.degree. C. orb) N-(2-hydroxypropyl)-2,6-dimethylmorpholine is caused to react in the presence of an acid catalyst at temperatures ranging from 100.degree. to 400.degree. C. followed by acid hydrolysis with water at temperatures ranging from 30.degree. to 300.degree. C.