The First Spacer-Bridged Tetraorganodistannoxanes with a Mixed Double Ladder Structure

Abstract

The reaction of Me 3 SiCH 2 Cl 2 Sn(CH 2 ) 3 SnCl 2 Ph (6) with (tBu 2 SnO) 3 gave a statistical mixture of the corresponding tetraorganodistannoxanes whereas the reaction of the spacer-bridged ditin tetrachlorides RCl 2 Sn(CH 2 ) 4 SnCl 2 R (3, R = Me 3 CCH 2 ; 4, R = Me 2 CHCH 2 ; 10, R = Me 3 SiCH 2 ) with the polymeric spacer-bridged ditin oxides [R(O)Sn(CH 2 ) 4 -Sn(O)R] n (7, R = Me 2 CHCH 2 ; 8, R = Me 3 CCH 2 ; 11, R = Me 3 SiCH 2 ) provided the mixed double ladder compounds [ ‡] This work contains parts of the Diploma thesis of M. Mehring, Dortmund University, 1995, and of the planned Ph. D. thesis of I. Paulus. [a]

Solvent-controlled assembling by hydrogen bridges and halogen-halogen interactions of novel organotin oxo clustersElectronic supplementary information (ESI) available: Synthesis and analytical data for PhI2SnCH2SnI2Ph. See http://www.rsc.org/suppdata/cc/b1/b111337b/

“…1). Similar to previously described double ladder structures, 7 8 The crystal structure of the solvent-free organotin oxo cluster 1 (Fig. 3) is characterised by a two-dimensional network being realised by a combination of two intermolecular † Electronic supplementary information (ESI) available: Synthesis and analytical data for PhI 2 SnCH 2 SnI 2 Ph.…”

Extending Distannoxane Double Ladders Using Rigid Spacers: A Double Ladder with Eight Chiral Tin Atomsand a Twist!

“…In this context we have recently reported examples of double and triple ladders ( A , R = alkyl, X = Cl, OAc; B , X = Cl, R = CH 2 SiMe 3 ). − Their structures are related to the well-known single ladders (distannoxanes) C (R = alkyl, aryl, X = range of anions), which are useful as mild Lewis acid catalysts in a variety of organic reactions. − Interestingly, distannoxanes have not yet found utility in synthesis requiring chiral transformations, probably because no suitable chiral distannoxanes have yet been reported. Furthermore, distannoxanes undergo extensive dissociation in solution, a property that also reduces their potential as chiral information transfer reagents. − By contrast, double and triple ladders undergo fewer dissociation reactions in solution, but, significantly, in these cases chiral information is retained at the tin centers . A key motivation for our investigations has been the synthesis of new double ladders that have little or no symmetry as well as to increase the size of the interlayer region …”

Organometallic Polymers of Germanium, Tin and Lead

“…The molecular structure of 134 exhibits a two-dimensional rhombohedral grid 286 in which the corners are composed of a ladder-type arrangement which is typical for tetraorganodistannoxanes 258,287 . The endocyclic tin atoms of the basic ladder fragment are connected by two oxygens to give the central almost planar Sn 2 O 2 ring.…”