A Methylene-Bridged Dialuminium Compound as a Chelating Lewis Acid: Complexation of Nitrite and Nitrate Anions by R2Al–CH2–AlR2[R = CH(SiMe3)2]☆
✍ Scribed by Werner Uhl; Frank Hannemann; Wolfgang Saak; Rudolf Wartchow
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 304 KB
- Volume
- 1998
- Category
- Article
- ISSN
- 1434-1948
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✦ Synopsis
Sodium nitrite (NaNO 2 ) dissolves readily in THF, when the aluminium atom to form a five-membered Al 2 CNO heterocycle. The second oxygen atom of the nitrite anion is not methylene-bridged dialuminium compound R 2 Al-CH 2 -AlR 2 [R = CH(SiMe 3 ) 2 ] 1 with two coordinatively unsaturated affected. Similarly, lithium nitrate (LiNO 3 ) reacts with 1 to yield a THF soluble product (6a). Single crystals were obtain-aluminium atoms is added. Compound 1 reacts as a chelating Lewis acid, and, as shown by a crystal structure deter-ed of the [Li(N,NЈ,NЈЈ-trimethyltriazinane) 2 ] + derivative 6c, whose structure shows each aluminium atom to be mination of the [Na([18]crown-6)(Et 2 O)] + derivative 5c, a compound (5) is formed, in which one oxygen atom and the coordinated by one oxygen atom of the nitrate ion to give a six-membered Al 2 CNO 2 heterocycle. nitrogen atom of the nitrite ion are each coordinated by one