摘要:
A process for the preparation of 1,4-3,6-dianhydro-hexitols from hexitols by elimination of water is described, characterized in that gaseous hydrogen halide is used as the acid dehydrating agent optionally with carboxylic acids, carboxylic acid halides and/or carboxylic acid anhydrides in quantities of up to 600 mol percent, based on the hexitols, as cocatalysts. The reaction is carried out in the absence of water and organic solvents, preferably using gaseous hydrogen chloride, temperatures of up to 300.degree. C. and pressures of up to 250 bar. Very high yields are obtained after working up of the product by distillation or extraction.
摘要:
The present invention relates to new polyamines corresponding to the formula ##STR1## in which R.sup.1 represents an alkyl, cycloalkyl or aryl group andR.sup.2 represents hydrogen or an alkyl group.The present invention is also directed to a process for the preparation of these amines by hydrogenating the corresponding trinitriles.
摘要:
The present invention relates to new carboxylic acid halides containing trifluoromethyl groups, of the formula (I) ##STR1## in which the symbols used have the meanings given in the description, a process for their preparation by reaction of perhalogenoalkanes with carbon monoxide and an olefin and their use for the preparation of textile auxiliaries.
摘要:
Reaction products of oxo compounds and amines or ammonia, in which at least one substituent is aromatic and monosubstituted to trisubstituted by halogen, can be catalytically hydrogenated to the respective amines, the halogen essentially being completely retained if an Ni-containing or Co-containing catalyst is employed and the reaction is carried out in the presence of organic sulphur compounds.
摘要:
The instant invention relates to hydroxyl polyethers which are modified with amide groups and a method of their manufacture. The method includes a first stage wherein a portion of the hydroxyl groups of a polyether polyol are aminated and a second stage wherein the amine groups are reacted with a carboxylic acid, its anhydride, ester or halide. The modified polyesters may be used for the production of polyurethane resins.
摘要:
New .alpha.-trifluoromethyl-substituted, saturated bicyclic amines of the formula ##STR1## in which R.sup.1 represents hydrogen, C.sub.1 - to C.sub.8 -alkyl or C.sub.1 - to C.sub.8 -alkoxy,R.sup.2 represents hydrogen or C.sub.1 - to C.sub.4 -alkyl,n represents zero or 1,A represents ##STR2## B represents NH or ##STR3## and C represents ##STR4## in which A, B and C are either each different from one another or C represents ##STR5## and one of A and B represents NH and the other represents ##STR6## and R.sup.3 denotes hydrogen or C.sub.1 - to C.sub.4 -alkyl and the ring D is saturated.
摘要:
The catalytic hydrogenation of .alpha.,.beta.-unsaturated ketones of the formulaR.sup.1 --CH.dbd.CH--CO--R.sup.2,in whichR.sup.1 and R.sup.2 independently of one another represent straight-chain or branched alkyl, hydroxy-alkyl, alkenyl, cycloalkyl, cycloalkenyl, aralkyl or aryl, where at least one of the radicals R.sup.1 and R.sup.2 is monosubstituted to trisubstituted by halogen,can be carried out on a Ni-containing catalyst and in the presence of an organic sulphur compound of the formulaR.sup.3 --S(.dbd.O).sub.n --R.sup.4in whichR.sup.3 and R.sup.4 independently of one another denote straight-chain or branched alkyl, hydroxy-alkyl, carboxyalkyl or phenyl, and furthermoreR.sup.3 and R.sup.4 may together represent --CH.dbd.CH--CH.dbd.CH--, --(CH.sub.2).sub.4 --, --(CH.sub.2).sub.5 --, --(CH.sub.2).sub.2 --S--(CH.sub.2).sub.2 -- or --(CH.sub.2).sub.2 --O--(CH.sub.2).sub.2 --,R.sup.4 may additionally denote hydrogen or CO--C.sub.1 -C.sub.12 -alkyl and n assumes the value 0 or 1.
摘要:
Novel substitued 5-cycloalkyl-2,2-dimethyl-pentan-3-ones of the formula ##STR1## in which R is optionally substituted cycloalkyl,X is halogen andY is hydrogen or halogen.The new compounds are valuable intermediates for the synthesis of substances having plant growth-regulating and fungicidal properties.
摘要:
New 2-trimethylsilyloxy-ethylamines are disclosed. They can be prepared by catalytic hydrogenation of 1-trimethylsilyloxynitriles which are substituted in the 2-position.
摘要:
Saturated, fluorine-containing and chlorine-free hydrocarbons are prepared by catalytically hydrogenating unsaturated, fluorine- and chlorine-containing hydrocarbons at temperatures above 80.degree. C. in the gas phase.