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In 1958, Bartlett and Hiatt [I J suggested that the number of bonds which are rotationally "frozen" at the transition state for decomposition of peresters can be determined from the magnitude of the values of AH: and AS*. In recent years, other workers have extended this hypothesis to include the use of the magnitude of AH* and AS* values to determine the number of bonds which undergo synchronous scission in the decomposition of initiators. This criterion for separating one-bond from two -or three-bond initiators is discussed in the light of all of the data now reported in the literature. It is probable that the correlation of AH: and AS: in an isokinetic plot cannot be used to distinguish either the number of bonds which are rotationally frozen at the transition state or the number that are undergoing scission, except in limited and rather imprecise ways. However, the insights and principles of Bartlett and Hiatt still are extremely useful as qualitative tools.
π SIMILAR VOLUMES
Since a large and growing number of natural products have been shown to contain fused cyclic acetals, such as furo [2,3-b]furans, as part structures [1] and since many of them have a variety of activities (e.g., antitumor, antimicrobial, and insect antifeedant), interest has rapidly grown and result
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