Chemistry Letters, Vol.37, No.7, 696-697, 2008
Dynamic behavior of cyclic hemiacetals of 2-hydroxy-2-(2-hydroxyphenyl)-1,3-indandione derivatives
Dynamic interconversion between the two enantiomeric hemiacetal structures in acetonitrile was revealed from the variable-temperature H-1 NMR spectra for the compounds obtained by the reaction of ninhydrin with phenol and p-nitrophenol.