1-Methylazepan-4-one is a methyl derivative of Azepan-4-one (A809755, HCl) and a useful synthetic intermediate in the synthesis of N-Methyl-4-[1-(4-chlorophenyl)-1-phenylethoxy)hexahydroazepine (M295095); an impurity in the synthesis of Clemastine Fumarate (C568500) which is a H1 histamine receptor antagonist and antihistaminic.