Triorganotin Enoxides

RaSiH + RaSiOCHtCMea R = Et, Ph (719, 719a), with MeSiCla - MeSi(OCH CMe2)3 + MeSi(OCH CMe2)Cl2 (7l9a), (i) 

ratio cis/trans 1+5/57 (I68I+). (j) Prod, ratio 25% Sn-C, 75% Sn-0 isomers (I68I+). (k) Prod, ratio 

MesSiCl - BtisSnCl + Me3SiOC(Bu-i) tCHCHMea ( +5l+) ( l) IR spectrum, very sensitive to HaO -+ i-BuCOCHtCHa (l681+)  

Organotin derivatives of diketones were regarded previously as having a Sn-C bond. Compounds of this type were listed in the main volume in Chapter 2.6.5.3 The recent literature leaves no doubt that a chelate structure with pentacovalent tin prevails. The compounds listed in Table 19 are prepared by methods from the following schane. 

I Replacement of a substituent with a p-keto group in R3SnCHsC0R by a 1,3-dicarbonyl compound R Me, OR, NR.  

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Listing of unsaturated alkoxides of the triorganotln moiety concludes in Table 17l -. Additional triorganotln alkoxides containing unsaturated substituted groups may be found in Tables I78-I8O and in Chapters 2.1. 5 and 2.5.3. Triorganotin enoxides are listed in Chapter 1. 5.1. 1.5. 

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