Abstract: Tri- and tetra-substituted guanidines which exhibit a high binding affinity to phencyclidine (PCP) receptors and, more preferably, low affinity to the brain sigma receptors. These guanidine derivatives act as non-competitive inhibitors of glutamate induced responses of the NMDA receptor by acting as blockers for the ion channel of the NMDA receptor-ion channel complex. These compounds thus exert neuroprotective activity and are useful in the therapeutic treatment of neuronal loss in hypoxia, hypoglycemia, brain or spinal cord ischemia, and brain or spinal chord trauma as well as being useful for the treatment of epilepsy, Alzheimer's disease, Amyotrophic Lateral Sclerosis, Parkinson's disease, Huntington's disease, Down's Syndrome, Korsakoff's disease and other neurodegenerative disorders.

Abstract: A process is disclosed for the extraction recovery of ethylene amines from an aqueous solution containing at least 10% by weight sodium chloride and not more than 5% by weight sodium hydroxide, the process comprised of mixing with said aqueous solution an extraction-effective amount of a polar organic solvent which is immiscible with an aqueous salt solution, miscible with water and having a boiling poing below about 105.degree. C. This mixture is allowed to form an organic phase and an aqueous salt solution phase. The organic phase, which contains at least a portion of the ethylene amines, is separated from the aqueous salt solution phase. The preferred polar organic solvent is n-propanol. The preferred temperature range for the process is between about 70.degree. C. and about 95.degree. C.

Abstract: Triazole compounds of the formulae Ia and Ib ##STR1## where R.sup.1 is hydrogen or cyclopropyl, or is C.sub.1 -C.sub.4 -alkyl, C.sub.2 -C.sub.4 -alkenyl or C.sub.2 -C.sub.4 -alkynyl, each of which is unsubstituted or substituted by methyl, ethyl, ethenyl, ethynyl, hydroxyl, fluorine, chlorine, bromine or C.sub.1 -C.sub.4 -alkoxy, or is C.sub.1 -C.sub.4 -alkoxy, C.sub.2 -C.sub.4 -alkenyloxy or C.sub.2 -C.sub.4 -alkynyloxy,R.sup.2 and R.sup.3 independently of one another are each hydrogen, straight-chain or branched C.sub.1 -C.sub.3 -alkyl, and R.sup.2 and R.sup.3 together may furthermore form a carbocyclic ring which has up to six members in each ring system and may possess bridge members, with the proviso that, in formula Ia, two or more of the radicals R.sup.1 -R.sup.3 are not hydrogen, and is hydrogen, an acyl radical CO-R.sup.5 or a sulfonyl radical SO.sub.2 R.sup.5, R.sup.5 being straight-chain or branched C.sub.1 -C.sub.