Alkoxy-substituted polysilanes

As discussed in Section VI.2.C below, the insertion of SiMeOMe into the Si-Si bonds of alkoxy-substituted polysilanes was also not observed. In 1972, Ishikawa, Takaoka, and Kumada attempted the insertion of SiMej into the Si-Si bonds of 1,2-diethyltetramethyldisilane. No 1,3-diethylhexamethyl-trisilane was observed, denying the insertion of SiMej into Si-Si bonds ... 

The second approach to linear polysilanes is based on the modification of polysilanes prepared by the reductive coupling method. The severe conditions of this reaction allow only alkyl or aryl substituents at the silicon atom in the starting dichlorosilane. Therefore only alkyl or aryl substituted polysilanes are known. We have successfully prepared new polysilanes with pendant alkoxy and amino side groups. This approach allows fine tuning of the properties of... 

Some Recent Studies Models for the para-Alkoxy Diaryl Substituted Polysilanes... 

On the other hand, unsymmetrically substituted polysilanes generally display a continuous red shift of their absorption maximum with decreasing temperature until a limiting wavelength is reached [67]. This general behavior is not followed by certain alkoxy- and alkyl-substituted polysilanes [68,69], which have revealed an abrupt red shift of their absorption maximum upon cooling. Indeed, these amorphous and chromic polysilanes... 

The chemical and physical properties of polysilanes are strongly influenced by substituents attached to the polymer backbone. In this respect, heteroatom-substituted polysilanes should be very much intriguing on their properties. However, heteroatom-functional substituents such as amino and alkoxy groups on silicon cannot survive under the vigorous synthetic conditions of polysilanes by the conventional Wurtz-type condensation of dichlorosilanes. Therefore, it is difficult to prepare heteroatom-functional polysilanes. We have recently found that amino-substituted masked disilenes can be prepared and polymerized successfully to unprecedented amino-substituted polysilane of the completely alternative structure, poly[l,l,2-trimethyl-2-(dialkylamino)disilene]. 

---