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The 2-D INEPT-INADEQUATE spectrum for 7 (Figure 2) is also irrefutable evidence for structural identification.7 Note that 8 (Figure 3b) would show a connected to b and b connected to c. The spectrum clearly shows a directly bonded to both b and c, with two-bond coupling between b and c and three-bond coupling between c and d.10•11

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range was 4 kbar. The results, shown in Figure 1, may be summarized by the statement that the activation volume for the concerted shift (I) equals -30 ± 5 cm3/mol and that for the stepwise reaction (II) is +10 ± 2 cm3/mol. These observations clearly confirm that this activation parameter provides a criterion for concertedness in sigmatropic shifts as well as for cycloadditions.Acknowledgment. The National Science Foundation generously supported this investigation. References and Notes(1) Paper 52 in the Series "Kinetics of Reactions in Solutions under Pressure".(2) Summarized in W.

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