Oxyanion-assisted retro-Diels–Alder reactions in the tricyclo[3.3.02,8]nona-3,6-diene (barbaralane) system
Abstract
9-Vinyl- and 9-aryl-tricyclo[3.3.1.02,8]nona-3,6-dien-9-olates (1c—h) underwent the retro-Diels-Alder reaction to give cycloheptrienes (2c—h) in excellent yields, indicating that it is not necessary for the fragmented 4π component to be incorporated into an aromatic nucleus.