Basf Aktiengesellschaft

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Peter Hettinger

Franz Merger

Arno Lange

Leopold Hupfer

Dieter Voges

Juergen Paetsch

Wolfgang Harder

Heinrich Adolphi

Claus-Ulrich Priester

Heinz Auer

Theodor Weber

Wolfgang Koernig

Hans-Martin Hutmacher

Erwin Brunner

Dieter Franz

Wolfgang Lengsfeld

Guenter Boettger

Heribert Deck

Trialkylamines and methyl formate are recovered from reaction mixtures obtained in the preparation of trimethylolalkanes by reaction of n-alkanals with from 2.2 to 4.5 moles of formaldehyde in aqueous solution in the presence of from 0.6 to 3 mole of trialkylamine, each quantity based on 1 mole of alkanal, and subsequent hydrogenation in a process wherein the crude reaction mixture

Recovery of trialkylamines and methyl formate from mixtures obtained in

3-Dialkylaminopropionitriles ##STR1## where R.sup.1 and R.sup.2 are each C.sub.1 -C.sub.4 -alkyl which may furthermore be bonded to form a 5-membered or 6-membered ring, bis-(2-cyanoethyl) ether II

Joint preparation of 3-dialkylaminopropionitriles, bis-(2-cyanoethyl)

2,2-Disubstituted 3-chloropropionic esters I ##STR1## where R.sup.1 and R.sup.2 are each C.sub.1 -C.sub.6 -alkyl, C.sub.2 -C.sub.6 -oxaalkyl, C.sub.2 -C.sub.6 -alkenyl, C.sub.2 -C.sub.6 -oxaalkenyl, aryl or C.sub.7 -C.sub.12 -aralkyl or R.sup.1 -C-R.sup.2 is 5-, 6- or 7-membered ring, R.sup.3 is C.sub.2 -C.sub.6 -oxaalkyl, C.sub.2 -C.sub.6 -alkenyl, C.sub.2 -C.sub.6 -oxaalkenyl or C.sub.7 -C.sub.12 -aralkyl, are prepared by converting 2,2-disubstituted 3-hydroxypropanals II ##STR2## into the esterdiol III ##STR3## reacting this esterdiol III in the presence of a transesterification catalyst with an alcohol R.sup.3 OH to give the 3-hydroxyester IV ##STR4## reacting the hydroxyester IV with a stoichiometric or greater than stoichiometric amount of the thionyl chloride and thermally decomposing the product to give the chloropropionic ester I.

Preparation of 2,2-disubstituted 3-chloropropionic esters

Joint preparation of ethylene cyanohydrin and its ethers

Neopentyl glycol hydroxypivalate is isolated from a reaction mixture obtained from a Tishchenko reaction of hydroxypivalaldehyde in the presence of calcium hydroxide, barium hydroxide or strontium hydroxide, by adding acid, removing the salts formed by adjusting the water content in the reaction mixture to 20-60% and extracting the salts at above 50.degree. C. and working up the residual mixture by distillation.

Isolation of neopentyl glycol hydroxypivalate

Trimethylolalkanes are prepared by reacting an n-alkanal with formaldehyde and a trialkylamine in aqueous solution and then hydrogenating the product, by a method in which from 2.2 to 4.5 moles of formaldehyde and from 0.6 to 3 moles of trialkylamine are used per mole of the alkanal, and the reaction mixture is worked up by distillation either before or after the hydrogenation.

Preparation of trimethylolalkanes from alkanals and formaldehyde

Novel ether-aldols of the general formula (I) ##STR1## where R.sup.1 and R.sup.2 are each alkyl, can be prepared by reacting a 2-alkylacrolein (H.sub.2 C.dbd.CHR.sup.2 --CHO), an alcohol (R.sup.1 OH) and formaldehyde, preferably aqueous formaldehyde, in the presence of a tertiary amine.

Preparation of aldols

Carbamates of the formula ##STR1## where either R.sup.1 is straight-chain or branched alkyl of not more than 4 carbon atoms and R.sup.2 is straight-chain or branched alkyl of not more than 6 carbon atoms, or R.sup.1 and R.sup.2, together with the molecular moiety which they include, form a 5-membered, 6-membered or 7-membered heterocyclic ring, R.sup.3 is straight-chain or branched alkyl of not more than 6 carbon atoms or cycloalkyl of 3 to 6 carbon atoms, R.sup.4 is methyl or methoxy, and n is 1 or 2, their preparation and their use as insecticides.

Insecticidal carbamates

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Edingen-Neckarhausen, Germany

Peter Hettinger