Preparation and characterisation of branched decaorganyltetratins, a new class of organotin compound

Preparation, Structure, and Reactivity of Discrete Branched Oligogermanes

“…This is attributed to the interaction of the individual arms of the branched system and is manifested in a red shift and broadening of the λ max peak versus those observed for linear polymers. , Branched group 14 oligomers are rare and for the tin-containing species only a few examples have been reported. These include RSn(SnMe 3 ) 3 (R = Me, Et, Bu n , Bu i , C 5 H 11 n , or Ph), as well as the lithium salt LiSn(SnMe 3 ) 3 and the neopentane analogues Sn(SnR 3 ) 4 (R = Me or Ph). A series of longer chain branched perbutyl polystannanes has also been reported …”

“…20,21 Branched group 14 oligomers are rare and for the tin-containing species only a few examples have been reported. These include RSn(SnMe 3 ) 3 (R ) Me, Et, Bu n , Bu i , C 5 H 11 n , or Ph), 22 as well as the lithium salt LiSn(SnMe 3 ) 3 23 (R ) Me 22 or Ph 24 ). A series of longer chain branched perbutyl polystannanes has also been reported.…”

On the Relation between One‐Bond Coupling Constants and the s‐Electron Density at the Nucleus

“…We have now carried out Mossbauer measurements on a series of organotin compounds R,Sn (SnMe3)4-, (n= 0-3) and on Me4Sn2 (OAc), in which the Sn, Sn-coupling constant varies between 14980 and 867 Hz (the relevant NMR. data have been published previously [2] [ 3 ] with one exception).…”

“…It does however have the disadvantage that the natural line width limits its sensitivity: thus for example although the Sn-chemical Table; for reference, the isomer shift of tetramethyltin is 1.16 mm/s, that of metallic tin 2.5 mm/s [5]. The relatively high S-value for Me4Sn2 (OAc), is explained by the fact that the Sn-atoms are pentacoordinate, the structure being formally of the type given in the formula, though in fact the CH3C02 ligand is isobidentate [3]. The Sn,Sn-bond in compounds of this type is known to be considerably shorter than in simple ditins where tin has the coordination number four [6] [7].…”

Poly(dialkylstannane) and poly(diarylstannane) homo- and random copolymers synthesized in liquid ammonia

“…Sn atoms bound to three other Sn atoms) in the polymer chain. 46 This also explained the broadening of the polymer signal at 2190 ppm, as a result of variances in the neighboring tin atoms of the main chain.…”