Triethanolamines Forming Silatranes

Silatranes are known since more than 50 years [287, 288] but are stiU fascinating molecules in the focus of an ongoing scientific interest. Fluoro-substituted quasisilatranes have been synthesized [214, 289-291]. Experimental and theoretically calculated electron density distribution functions in the crystal structure of 84 have been investigated [214]. Properties of chemical bonding in silatranes have also been studied in 1-hydrosilatrane [218] and 1-fluorosilatrane [219]. 

One aspect of recent interest is the functionalization of silatranes via a silicon-bound alkyl group. Examples for such compounds are 3-isothiocyanatopropylsilatrane 

Hexacoordinated salen-silicon complexes can undergo Wurtz-type coupling reactions to produce the first examples of oligosilanes and polysilanes containing hexacoordinated silicon backbones [149]. This principle has been utilized to couple salen-type complexes containing thiocyanato ligands [Si(salen )(NCS)2l to a mixture of linear oligosilanes with a hexacoordinated silicon backbone SCN-[Si(salen )] -NCS with n = 2-8 [147]. 

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