Bisguanidinato and bisamidinato Tin(IV) diolates applicable in ring-opening polymerization

Abstract Series of bisamidinato and bisguanidinato tin(IV) diolates prepared from 1,2-diones (3,5-di- tert -butyl- o -benzoquinone, 3,4,5,6-tetrachloro-1,2-benzoquinone, 9,10-phenanthrenedione, acenaphthenequinone, 1,2-diphenylethanedione) and {Cy-NC( n -Bu)N-Cy} 2 Sn or { p Tol-NC[N(SiMe 3 ) 2 ]N- p Tol} 2 Sn, respectively, were used as efficient initiators for ring-opening polymerization of e-caprolactone. Moderate to good efficiency of selected compounds in trimethylene carbonate polymerization was also observed.