Reaction of 1-(Chloroalkyl)-1-aza-2-azoniaallene Salts with Alkenes: Preparation of Cyclic Azo, (Azoalkyl)azonium, and Formazanium Compounds - Al-Soud, Yaseen A; Wirschun, Wolfgang; Hassan, Nasser A; Maier, Gerd-Michael; Jochims, Johannes C (Synthesis, 1998)