1. EaStCHEM, School of Chemistry, University of Edinburgh, Edinburgh, EH9 3JJ (UK)
2. Organic Chemistry, Institute of Chemical and Engineering Sciences, A*STAR, Singapore 138667 (Singapore)
3. Department of Chemistry, University of Illinois at Urbana‐Champaign, Urbana, IL 61801 (USA) http://www.scs.illinois.edu/denmark