Über Pterinchemie. 62. Mitteilung. Protonenkatalysierte [1,2]‐H‐Verschiebung bei der Umlagerung von 6,7‐Diphenyl‐5,6‐dihydropterin zu 6,7‐Diphenyl‐7,8‐dihydropterin

Proton catalysed [1,2]-H-shift in the rearrangement of 6,7-diphenyl-5,6-dihydropterine (I) to 6,7-diphenyl-7,8-dihydropterine (III) The arrangement from I to the thermodynamically more stable III undergoes through a acid catalysed [1,2]-H-shift (intramolecular 6,7-hydride rearrangement) (see Scheme 1).