STANNACYCLOALKYL AND STANNEPINYL DERIVATIVES OF DIPEPTIDES

Stannacyclohexyl and stannacycloheptyl derivatives of dipeptides (CH2) nSnAA.xH2O (H2AA= H2GlyGly, with n=5, x=2 or n=6, x=1; H2AA = H2GlyAla , H2GlyVal, H2GlyMet, with n= 5, 6, x = 1) and stannepinyl glycylglyci nate monohydrate have been obtained by the reaction of (CH2)nSnCl2 or stannepinyl dichloride with Na2AA. According to infrared and Sn-119 Mo ssbauer data of the solid compounds, AA acts as a tridentate ONN ligan d and tin has a trigonal-bipyramidal environment. An analogous structu re has been inferred from H-1, C-13, and Sn-119 NMR data for the undis sociated molecules in methanol solution.