Intramolecular reversibility

III. Intramolecular Reversible Addition Reactions to Other Groups. 54 

On the other hand, an intramolecular reversible rotation of the two mesityl rings in 2,2-dimesityl-l-(trimethylsilyl)ethenol (202) occurs to give 203 (equation 83)258. The free energy of activation for the rotation (AG ) leading to the enantiomerization is 

Ring-chain tautomerism via intramolecular reversible addition reactions to the C=0 group 95AHC(64)251. 

Valters, R. E., Fulop, F., Korbonits, D., Recent Developments in Ring-Chain Tautomerism I. Intramolecular Reversible Addition Reaction of the C=0 Group, 

Tsai, T.-G., Yu, C.-H. Effect of orbital overlap in thermal reverse homo-Diels-Zklder reactions and an intramolecular reverse ene reaction. J. Chin. Chem. Soc. (Taipei) 1994,41,631-634. 

In the second group of ring-chain tautomeric interconversions, an open-chain system is transformed into a cyclic system through the intramolecular reversible addition of a functional group to a polar multiple bond lA IB 2A 2B 3A 3B and 4A 4B. The book (I) and this article deal with 

The reversible first-order reaction (1.47) can be converted into an irreversible A X process by scavenging X rapidly and preventing its return to A. Thus the intramolecular reversible electron transfer in modified myoglobin (Sec. 5.9) 

This chapter is the first part of a review that updates an earlier work by R. E. Valters and W. Flitsch, Ring-Chain Tautomerism (A. R. Katritzky, ed.). Plenum Press, New York and London, 1985. The second part of this review, to be published in a subsequent volume of Advances in Heterocyclic Chemistry, includes data (1982-1993) for intramolecular reversible addition reactions to C = N, C=N, C = C, and C=C groups. 

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