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An Alternative Synthesis of the Oligoalumosiloxane [Ph~2~SiO]~8~[Al(O)OH]~4~ and its Alcohol Adducts by Michael Veith; Andreas Rammo; Volker Huch is a Chemistry article available to read on EtoBox.

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## Abstract The oligoalumosiloxanes {[Ph~2~SiO]~8~[Al(O)OH]~4~·2,5Et~2~O·HO__t__Bu} (6) and {[Ph~2~SiO]~8~[Al(O)OH]~4~·2Et~2~O·2HO__i__Pr} (7) have been obtained from the reaction of diphenylsilanediol with aluminium‐__tri__‐__tert__‐butoxide and aluminium‐__tri__‐__iso__‐propoxide in ethyl ether with reasonable yields. In a 1:1 molar mixture of toluene and the respective alcohol (__iso__‐propanol or __tert__‐butanol), the ethyl ether molecules in {[Ph~2~SiO]~8~[Al(O)OH]~4~·4Et~2~O}, in 6 or 7 can be completely displaced forming the compounds [Ph~2~SiO]~8~[Al(O)OH]~4~·4HO__i__Pr (8) and [Ph~2~SiO]~8~[Al(O)OH]~4~·__n__HO__t__Bu (9). Whereas 6, 7 and 8 are crystalline, 9 is obtained as a viscous liquid. An X‐ray structure determination on {[Ph~2~SiO]~8~[Al(O)OH]~4~·3Et~2~O·HO__t__Bu} reveals different bonding modes of the diethyl ether molecules to the oligoalumosiloxane compared to the __tert__‐butanol, which forms two hydrogen bonds (one to the OH‐group of the inner Al~4~(OH)~4~ cycle and one through the alcohol OH‐group to a Si–O–Al moiety. The alcohol adducts have been characterized in solution through ^1^H‐, ^13^C‐ and ^29^Si‐NMR and show dynamic equilibria between the oligoalum

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Author

Michael Veith; Andreas Rammo; Volker Huch

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); Wiley - V C H Verlag GmbbH & Co.; Wiley (ISSN 0372-7874)

Published

2009

Language

DE

Field

Chemistry (Physical Sciences)