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The kinetics studies were done by standard methods using nmr spectroscopy to measure concentrations.7" While in ref 6 only formation of 4 by rearrangement of 2a is reported, we have found not less than 100 times that 2a neat and in CD3CN or CeHsCN always leads to approximately 1 :1 mixtures of both isomers 4 and 5. Characterization of 4 and 5 will be published elsewhere.(10) Nmr (CDCls-TMS, 60 MHz): 2Me-5, 2.01 and 2.03 (small couplings each); H-3, 6.53 (Ja,j = 11.2 Hz; small couplings to both methyls); H-4, 7.51 ( ,3 = 11.2 Hz; possible small coupling to a methyl); CHO, 9.60 (singlet); mp 70-71°; X (MeOH) 299 nm (log c 4.58).

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