A novel acetylenic amine and an aqueous composition containing said amine for inhibiting the corrosion of metals is described. The composition comprises a non-oxidizing acid, and, as a corrosion inhibitor, an effective amount of tertiary amine containing acetylenic unsaturation having the formula:
wherein R1 and R2 are independently C1-C8 alkyl or phenyl and R3 is selected from the group of branched chain C7-C10 alkyl, cinnamyl optionally mono- or di-substituted with halo, C1-C8 alkyl and/or C1-C8 alkoxy; mono- or di-similarly substituted phenyl or, when R1 and R2 are other than C1-C2 alkyl, then R3 can be unsubstituted phenyl.
Copper(I)-Catalyzed Substitution Reactions of Propargylic Amines: Importance of C(sp)−C(sp<sup>3</sup>) Bond Cleavage in Generation of Iminium Intermediates
amines proceed in the presence of copper(I) catalysts. Mechanistic studies showed that C(sp)-C(sp(3)) bondcleavage assisted by nitrogen lone-pair electrons is essential for the reaction, and the resulting iminium intermediates undergo amine exchange, aldehyde exchange, and alkyne addition reactions. Because iminium intermediates are key to aldehyde-alkyne-amine (A(3)) coupling reactions, this transformation