Ruthenium-complex-catalysed de-ammonification polycondensation of aromatic diamines

The use of RuCl 2 (PPh 3 ) 3 as a catalyst, in combination with 1,4-butynediol, activates the C–N and N–H bonds in aromatic diamines, yielding aromatic polyamines with pyrrolyl end groups and ammonia as a byproduct.