Reaction of N,N′‐Dialkyl Selenium Diimides with Bis(amino)stannylenes — Formation of a Tin‐Tin Bond

Abstract

AbstractN,N′‐Dialkyl selenium diimides 1, R(NSeN)R [R = tBu (a), tOct (b)], react with bis(amino)stannylenes such as 1,3‐di‐tert‐butyl‐4,4‐dimethyl‐1,3,4,2λ2‐diazasilastannetidine (2), 1,3‐di‐tert‐butyl‐4,4,5,5‐tetramethyl‐1,3,4,5,2λ2‐diazadisila‐stannolidine (3), bis[tert‐butyl(trimethylsilyl)amino]stannylene (4) and bis[bis(trimethylsilyl)amino]stannylene (5) in a 1 : 1 ratio. The products are either the spiro‐tin(IV) compounds 6 and 7, consisting of the respective cyclic bis(amino)stannylene and a four‐membered ring, or the analogous four‐membered 1,2,4,3‐selenadiazastannetidine rings 8 and 9 with the amino groups linked to the tin atom. Only in the case of the four‐membered cyclic stannylene 2, two equivalents of 2 may also react with 1 a to a polycyclic compound 10: Two molecules of 2 are linked by a tin‐tin bond and this bond is bridged by the NSeN group, to give a five‐membered ring with close SnSe contacts. All products were characterized by multinuclear magnetic resonance spectroscopy (1H, 13C, 15N, 29Si, 77Se, 119Sn NMR) in solution, and the molecular structure of the polycyclic compound 10 was determined by single crystal X‐ray analysis [monoclinic; space group C2/c; a = 3 294.1(3), b = 1 321.5(3), c = 1 855.9(2) pm and β = 98.02(2)°].