N-Butyl-4-pentyl-4'-biphenylamine has an enantiotropic smectic-A phase between 45 and 78 degrees. 4-Pentyl-4'-biphenyl methanamine has a monotropic smectic phase from 63 to 56 degrees. These compds. together with the previously reported phenylcyclohexane analogs, are examples of liq. cryst. amines not involving intramol. H bonding or extensive congugative interactions. Chem. Abstr. Vol. 91, 185126r.