2-(N-Phenylamino) propanoic acid and 3-(N-phenylamino)-propanoic acid together with four of their aryl analogues were pyrolysed in the gas-phase. The reactions were homogeneous and free from catalytic and radical pathways. Analysis of the pyrolysate of showed the elimination products to be carbon monoxide, acetaldehyde and aniline, while the pyrolysate of reveals the formation of acrylic acid in addition to aniline. Theoretical study of the ...