Hans-Werner Wanzlick (1917-1988) was a German chemist. A Professor of chemistry at Technische Universität Berlin he is notable for work on persistent carbenes and for proposing the Wanzlick equilibrium between saturated imidazolin-2-ylidenes and their dimers — which he called "das doppelte Lottchen", after a 1949 novel by Erich Kästner about a pair of mischievous twins. Anthony J. Arduengo, III (1999) Looking for Stable Carbenes: The Difficulty in Starting Anew. Accounts of Chemical Research, volume 32, number 11, pages 913–921.
References
Hans-Werner Wanzlick (1958), letter to Linus Pauling (in German). Linus Pauling's Correspondence, item #444.6.