BENZO[B]THIEPIN RING SYSTEM . A 12-PI-ELECTRON SYSTEM

Derivatives of the benzo [b]thiepin ring system have been prepared by primary reactions designed as synchronous fragmentations involving 13 elimination and ring opening of a three-membered ring, as illustrated in 2 → 4. Evidence for the formation of the unstable benzo [b] thiepins 7 and, 13 is presented; derivatives of these ethers with potential hydroxyl groups exist entirely in the keto form. © 1969, American Chemical Society. All rights reserved.