Silanethione 2a and silaneselenone 2b—stabilized by intramolecular Si ← N coordination— are obtained as shown below. The X‐ray structure analysis of 2a, 1‐naphthyl instead of phenyl, reveals strong zwitterionic character, which might explain the unexpectedly low reactivity toward nucleophiles and electrophiles (a, X = S; b, X = Se).

No abstract

The mild cleavage of phosphonodiester groups supported on a silica matrix has been investigated. The use of TMSBr (bromotrimethylsilane) with diethyl phosphonates has been revisited, and interactions of phosphonoacids with silicon species are described. An alternative route utilising di-tert-butyl phosphonate group has also been studied and in this case cleavage has been demonstrated in very mild conditions.Scheme 1 Gelification of (diethoxyphosphorylethyl)triethoxysilane, hydrolysis of the phosphonate function.

No abstract