B. Zobel et al., NOVEL MOLECULAR ORGANOTIN OXIDES DERIVED FROM ALKYLIDENE BRIDGED DITIN PRECURSORS - SYNTHESES AND STRUCTURES, Organometallics, 17(18), 1998, pp. 4096-4104
New diorganotin compounds (RCl2Sn)(2)(CR'(2))(n) [R = (SiMe3)(2)CH; R'
= Me, H; n = 1-3] Linked by various spacers have been synthesized. Th
ese react with sodium hydroxide or (t-Bu2SnO)(3) to give (R(O)Sn)(2)(C
R'(2))(n). Compounds 8 (R' = Me, n = 1), 9 (R' = H, n = 2), and 10 (R'
= H, n = 3) contain four-coordinate tin atoms. Compound 9 undergoes a
reversible hydrolysis reaction from which a solid containing three di
tin units has been isolated. Evidence is presented for the existence i
n solution of monomeric four-coordinate tin compounds (RXSn)(2)(CH2)(3
)O [R = (SiMe3)(2)CH, X = Cl, OH]. Crystal structures for monomeric di
tin precursors s[bis(trimethylsilyl)methyldichlorostannyl]propane (3)
and is[bis(trimethylsilyl)methyldichlorostannyl]ethane (6), for dimeri
c units hyl-2,4,6,8-tetraoxa-1,3,5,7-tetrastannaadamantane (8), ricycl
o[7.3.1.13.7]-1,3,7,9-tetrastannatetradecane (10), and imethylsilyl)me
thyl]-1-oxa-2,6-distannacyclohexane dimer (12), and for trimeric units
{O[(RSn(CH2)(2)SnR)OH]OH}(3). 2H(2)O (9a) are reported.