Mixed-metal calix[8]arene complexes: structure, and ring opening polymerisation studies.

Reactions of différent combinations of group V alkoxides or tungsten oxyalkoxide salts with p-tert -butylcalix[8]areneH 8 (L 8 H 8 ) affords mixed-metal calix[8]arene systems. Intruiging molecular structures are formed and the systems are capable of the ring opening polymerisation of ε-caprolactone under N 2 , air, or as melts affording mostly low molecular weight products.