Untitled

Abstract

The syntheses of the asymmetrically substituted tetraorganodistannoxanes [t-Bu 2 (X)SnOSn(Y)(CH 2 SiMe 3 ) 2 ] 2 (1, X = Y = OH; 2, X = Cl, Y = OH; 3, X = Y = Cl) are reported and their structures in solution and in the solid state are characterized by multinuclear NMR spectroscopy and single crystal X-ray analyses. In toluene, the tetrahydroxysubstituted derivative 1 is in equilibrium with the organotin oxides cyclo-[t-Bu 2 Sn{OSn(CH 2 SiMe 3 ) 2 } 2 O] (4), cyclo-[(Me 3 SiCH 2 ) 2 Sn(OSnt-Bu 2 ) 2 O] (5), and cyclo-(t-Bu 2 SnO) 3 , and some additional, undefined species containing pentacoordinated tin atoms. In contrast, the dihydroxydichlorosubstituted derivative 2 is inert in solution.

The First Well-Defined Tellurastannoxanes: the X-ray Structure of trans-[(Bu3SnO)2{CH2(Ph2SnO)2}2Te]

“…The reason for selective formation of the mer-isomer under these reaction conditions is still not understood. [14] The reaction of mer-[(Bu 3 SnO) 3 Te(OH) 3 ] (1) with two equivalents of (Ph 2 SnOH) 2 CH 2 [15] gave, with elimination of water and one equivalent of tributyltin hydroxide (Bu 3 SnOH), the spirocyclic tellurastannoxane derivative trans-[(Bu 3 SnO) 2 {CH 2 (Ph 2 SnO) 2 } 2 Te] (2) in good yields [Equation (2)]. [13] The identity of these species was unambiguously proven by 119 Sn and 125 Te NMR spectroscopy, although all attempts to isolate pure compounds from the mixtures failed.…”

The First Well-Defined Tellurastannoxanes: the X-ray Structure oftrans-[(Bu3SnO)2{CH2(Ph2SnO)2}2Te]

“…Moreover, reactions between Te(OH) 6 and other triorganotin methoxides, R 3 SnOMe (R ϭ Me, cHex, Ph), also provided mixtures of products that could not be purified. [14] The reaction of mer-[(Bu 3 SnO) 3 Te(OH) 3 ] (1) with two equivalents of (Ph 2 SnOH) 2 CH 2 [15] gave, with elimination of water and one equivalent of tributyltin hydroxide (Bu 3 SnOH), the spirocyclic tellurastannoxane derivative trans-[(Bu 3 SnO) 2 {CH 2 (Ph 2 SnO) 2 } 2 Te] (2) in good yields [Equation (2)]. (2) Compound 2 is a colorless crystalline material.…”

Synthesis and structure of diorganotin dibromides, R2SnBr2 (R = 2,4,6-trimethylphenyl or 2,4,6-trimethylbenzyl): Hydrolysis of (2,4,6-Me3C6H2)2SnBr2

“…These belong to the well-known family of ladder structures, which consist of a central distannoxane (Sn 2 O 2 ) motif. 17 All the tin atoms in both of these com-pounds are present in a distorted trigonal bipyramidal geometry. The equatorial sites are occupied by two carbon atoms and one oxygen atom.…”