Michael E. Brennan

TL;DR: Piperazine is substantially selectively converted to ethylenediamine and N-aminoethylpiperazine by catalytically reductively aminating piperazine in the presence of added hydrogen, ammonia and (optionally) water under reductive amination conditions selected to provide a pizerazine conversion of not more than about 30% as discussed by the authors.

TL;DR: In this article, an improved process for selectively preparing an N-(aminoalkyl)piperazine compound is disclosed wherein piperazine is contacted with a primary or secondary amino alkanol compound in the presence of a catalytically effective amount of a phosphorus-containing substance at a temperature of from about 250°C to about 350°C under a pressure sufficient to maintain the mixture essentially in liquid phase.

TL;DR: In this paper, a mixture of a Mannich condensate, a minor amount of melamine and 1 to 6 mols of formaldehyde, based on the melamine, was used to prepare rigid foams having improved fire retardancy properties.

TL;DR: N-(2-hydroxyethyl)piperazine is prepared by carrying out a reductive alkylation and cyclization reaction of monoethanolamine and diethanolamine in presence of a hydrogen atmosphere and a hydrogenation-dehydrogenation catalyst as mentioned in this paper.

TL;DR: In this article, the Mannich condensates of phenol, formaldehyde and diethanolamine were used to make a rigid polyurethane foam having improved fire retardancy properties.