Nm. Goudgaon et al., UNEXPECTED FORMATION OF NOVEL BUTENOLIDES BY THERMOLYSIS OF O-CARBORANYL SUBSTITUTED CYCLOBUTENONES, Tetrahedron letters, 39(14), 1998, pp. 1869-1872
On thermolysis, o-carboranyl substituted 4-aryl-4-hydroxycyclobutenone
s 5a-d undergo electrocyclic ring opening followed by ring closure to
yield substituted butenolides 6a-d. This is in contrast to the thermol
ysis of cyclobutenones which generally produces substituted quinones.
Published by Elsevier Science Ltd.