S. Kohmoto et al., ACID-CATALYZED, DEHYDRATIVE AROMATIZATION OF 1,7-LACTOL RING-FUSED AND 7-HYDROXYMETHYL NORCARADIENES - A SPECIFIC CLEAVAGE OF THE C-1-C-7 BOND, Tetrahedron letters, 36(4), 1995, pp. 553-554
A specific cleavage of the C-1-C-7 bond, one of the three sigma-bonds
of cyclopropane moiety, of norcaradienes 1 was accomplished by acid ca
talyzed, dehydrative aromatization of the corresponding lactols to giv
e 2H-pyran derivatives.