Silabenzenes, formation, stability

The silaaromatics 36 and 38 reveal in the observed UV spectra an additional bathochromic shift compared to silabenzene 24. Both, 36 and 38, disappear in an irreversible process upon irradiation with X = 290-420 nm, probably due to the formation of the corresponding Dewar silabenzenes. The kinetically stabilized silaaromatics 36 and 38 turned out to be stable up to 90 K even without an argon cage, but decomposed unspecifically at higher temperatures. 

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