Yl. Dory et al., 1ST EVIDENCE OF A CHAIR-BOAT-BOAT TRANSITION-STATE IN THE TRANSANNULAR DIELS-ALDER REACTION, Bulletin de la Societe chimique de France, 131(2), 1994, pp. 121-141
Nine cis-trans-trans (CTT) macrocyclic trienes containing various subs
tituents have been constructed (scheme 11) and their transannular Diel
s-Alder reactions yielding various CAC tricyclic isomers are reported.
This work can be taken as evidence that the chair-boat-boat transitio
n state can compete with the chair-boat-chair transition state.