Compounds containing a 1,5-hexadien-3-ol system undergo anionic oxy-Cope re
arrangement when treated with the phosphazene super-base, P-4-t-Bu. The [3,
3] sigmatropic rearrangement occurs in hexane as well as in THE The weaker
phosphazene base, P-2-Et fails to induce rearrangement. This is the first e
xample of the use of a metal-free base to induce anionic oxy-Cope rearrange
ment. (C) 2000 Elsevier Science Ltd. All rights reserved.