Degussa Aktiengesellschaft

Hans Remmel

Werner Schwarze

Siegfried Wolff

Horst Lambertz

Karlheinz Drauz

Axel Kleemann

Hans-Peter Krimmer

Wolfgang Hohn

Alkali metal salts of 2-pyrrolidone-5-carboxylic acid (pyroglutamic acid) are prepared by heating the corresponding alkali metal salt of glutamic acid to a temperature between its melting point and 270.degree. C. until the water liberated by the intramolecular condensation (cyclocondensation) has been completely eliminated.

Method of preparing alkali metal salts of 2-pyrrolidone-5-carboxylic acid

The invention is directed to bis-(2-ethylamino-4-diethylamino-s-triazine-6-yl)-tetrasulfide and a process for its production from the corresponding mercaptotriazine. The compound of the invention is employed in vulcanizable mixtures as a cross-linker or as vulcanization accelerator.

Bis-(2-ethylamino-4-diethylamino-s-triazine-6-yl) tetrasulfide, process

The invention is directed to bis-(2-ethylamino-4-diethylamino-s-triazin-6-yl)-tetrasulfide and a process for its production from the corresponding mercaptotriazine. The compound of the invention is employed in vulcanizable mixtures as a cross-linker or as vulcanization accelerator.

Vulcanizable mixture containing

.gamma.-chlorocarboxylic acid methyl or ethyl esters are cyclized to the corresponding cyclopropane carboxylic acid esters by employing the sodium or potassium alcoholate of methanol or ethanol in the presence of the same alcohol at a temperature above the boiling point of the alcohol employed.

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Freigericht, Germany

Hans Remmel