Abstract: 1,2-FUSED FIVE-MEMBERED OR SIX-MEMBERED 1,3-DINITROGEN-HETEROCYCLIC COMPOUNDS, USFUL AS ANTI-CORROSION AGENTS, HAVING THE FORMULA ##STR1## wherein A is an optionally substituted, optionally polynuclear orth- or peri-arylene radical andB is an optionally substituted alkylene chain ##STR2## WHEREIN R.sup.1 and R.sup.2 individually represent hydrogen and/or optionally substituted aliphatic, cycloaliphatic, araliphatic or aromatic radicals andn represents a number from 3 to 6,OrB is an optionally substituted 1,8-naphthylene, 2,2'-diphenylene or 4,5-phenanthrylene radical,Are prepared by splitting a five-membered or six-membered 1,3- dinitrogen-heterocyclic compound, which contains a 2-(.omega.-amino group) side chain, having the formula ##STR3## wherein A and B have the meanings indicated above andR.sup.3 and R.sup.4 are hydrogen, lower alkyl, cycloalkyl or aralkyl but at least one of the two radicals R.sup.3 and R.sup.4 must represent hydrogen.

Abstract: A compound of the formula ##STR1## or a salt thereof, OR OF THE FORMULA ##STR2## OR A SALT THEREOF, WHEREINR.sup.1 and R.sup.2 are the same or different and each is hydrogen, lower alkyl, cycloalkyl of 4 to 7 carbon atoms, aryl of 6 to 14 carbon atoms, or aralkyl of up to 18 carbon atoms wherein the alkyl moiety contains up to 6 carbon atoms; andn is 3, 4 or 5;Is produced by hydrolyzing a compound of the formula ##STR3## wherein R.sup.1, R.sup.2 and n are as above defined, andX is halogen;A compound of the formula ##STR4## or a hydrohalide thereof, wherein R.sup.1, R.sup.2, n and X are as above defined; orA compound of the formula ##STR5## wherein R.sup.1, R.sup.2, n and X are as above defined;In the presence of a base at a temperature of from about 20.degree. to about 180.degree. C.The compounds produced are valuable intermediates from which cyclic amino acids and .alpha.,.omega.-diaminocarboxylic acids are obtained.

Abstract: N-chloroformyl carbamic acid amides and esters having the functional group ##EQU1## are prepared by reacting phosgene with an imino compound having the functional group ##EQU2## and free of interfering radicals. Preferably the starting material has the formula ##EQU3## in which R.sup.1 is a monovalent or divalent optionally substituted aliphatic, cycloaliphatic, araliphatic or aromatic radical,R.sup.2 is an optionally substituted alkyl or aralkyl radical,R.sup.3 is a monovalent optionally substituted aliphatic, cycloaliphatic, araliphatic or aromatic radical, and any two of the radicals R.sup.1, R.sup.2 and R.sup.3 can conjointly be a constituent of a 4-membered to 7-membered heterocyclic ring,X is oxygen, sulfur or an N--R.sup.4 radical, in whichR.sup.4 is an optionally substituted C.sub.1 -C.sub.6 alkyl, cycloalkyl, aralkyl or aromatic radical, orR.sup.3 and R.sup.4 together optionally form a constituent of a 4-membered to 7-membered ring, andn is 1 when R.sup.1 is monovalent and 2 when R.sup.1 is divalent.

Abstract: Corrosion-inhibiting aqueous solutions and corrosion inhibiting antifreeze agents based on glycols and aqueous solutions thereof are prepared by adding two such solutions and agents already containing conventional corrosion inhibitors, heterocyclic nitrogen compounds having the formula: ##STR1## wherein: R.sup.1 and R.sup.2 are hydrogen or together with the carbon atoms to which they are attached represent an optionally substituted benzene ring;R.sup.3, r.sup.4, r.sup.5 and R.sup.6 independently of one another are selected from the group of hydrogen, lower alkyl, phenyl substituted by one or more lower alkyls;X is sulphur or an imino group (NH) optionally substituted on the nitrogen atom; andn is an integer from 1 to 13, added to an aqueous solution or antifreeze agent which contains at least one conventional corrosion inhibitor.

Abstract: 2-(.omega.-AMINOALKYL)-1,3-HETEROCYCLIC COMPOUNDS ARE PREPARED BY REACTING A COMPOUND SELECTED FROM THE GROUP OF A DIAMINE, AN AMINOHYDROXY AND AN AMINOTHIOL COMPOUND, SAID COMPOUND HAVING THE FORMULA: ##EQU1## wherein ##EQU2## A is a bivalent chain of 2 or 3 carbon atoms, which can also be part of a bivalent, optionally substituted aliphatic, cycloaliphatic, araliphatic or aromatic radical, andX is oxygen, sulphur or the group ##EQU3## wherein R.sup.7 is as defined herein with a lactam having the formula ##EQU4## WHEREIN B is selected from the group of a single bond, oxygen, sulphur, the group ##EQU5## wherein R.sup.6 is as defined herein, and arylene,R.sup.1, r.sup.2, r.sup.3 and R.sup.4, which may be the same or different, are selected from the group of hydrogen, halogen, nitro and optionally substituted aliphatic, cycloaliphatic, araliphatic and aromatic,R.sup.5, r.sup.6 and R.sup.

Abstract: N-Chloroformyl carbamic acid amides and esters having the functional group ##EQU1## are prepared by reacting phosgene with an imino compound having the functional group ##EQU2## and free of interfering radicals. Preferably the starting material has the formula ##EQU3## IN WHICH R.sup.1 is a monovalent or divalent optionally substituted aliphatic, cycloaliphatic, araliphatic or aromatic radical,R.sup.2 is an optionally substituted alkyl or aralkyl radical,R.sup.3 is a monovalent optionally substituted aliphatic, cycloaliphatic, araliphatic or aromatic radical, and any two of the radicals R.sup.1, R.sup.2 and R.sup.3 can conjointly be a constituent of a 4-membered to 7-membered heterocyclic ring,X is oxygen, sulfur or an N-R.sup.4 radical, in whichR.sup.4 is an optionally substituted C.sub.1 -C.sub.6 alkyl, cycloalkyl, aralkyl or aromatic radical, orR.sup.3 and R.sup.4 together optionally form a constituent of a 4-membered to 7-membered ring, andn is 1 when R.sup.1 is monovalent and 2 when R.sup.1 is divalent.