SYNTHESIS AND STRUCTURE OF ORGANOTIN(IV) COMPLEXES OF MALTOL

A series of organotin(IV) maltol complexes R4-xSnLx (1-4, 6; x = 1-3) and the dichloro-compound Cl2SnL2 (5) have been prepared and character ized on the basis of their IR-, H-1-, C-13- and Sn-119-NMR data. While an X-ray crystal structure analysis of Ph2SnL2 (4) and Cl2SnL2 (5) re veals distorted cis-octahedral structures, the Me2SnL2 molecule (2) ad opts a skew-trapezoidal bipyramidal configuration with a very signific ant difference in the Sn-O(keto) bond distances. The tris-maltol compl ex BuSnL3 (6) exhibits a distorted pentagonal-bipyramidal geometry wit h the butyl carbon and a hydroxy oxygen constituting the axial orienta tions.