Pure Appl. Chem., 1993, Vol. 65, No. 1, pp. 157-163
doi:10.1351/pac199365010157
Extended systems of closed helicene. Synthesis and characterization of [7] and [7.7]-circulene
K. Yamamoto
Pure Appl. Chem., 1993, Vol. 65, No. 1, pp. 157-163
doi:10.1351/pac199365010157
K. Yamamoto