The base-catalysed cyclisation to the hydantoin of 2,2,3-trimethyl-5-phenylhydantoate (2; R1= R2= Me) is slower than that of the 2,3-dimethyl compound, even though the acceleration expected from the gem-dimethyl effect is observed for the acid-catalysed reaction.
I. B. Blagoeva and D. T. Tashev, J. Chem. Soc., Perkin Trans. 1, 1989, 1157 DOI: 10.1039/P19890001157
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