Synthesis and Structures of Hydrazinoalanes and Hydrido(hydrazino)aluminates☆

✍ Scribed by Heinrich Nöth; Thomas Seifert

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 206 KB
• Volume: 1998
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/(sici)1099-0682(199812)1998:12<1931::aid-ejic1931>3.0.co;2-f

✦ Synopsis

Several monomeric dimethylaluminium hydrazide ether monometallated LiAlH 3 [(Ph)N-N(SiMe 3 ) 2 ] × 2 Et 2 O (8) with elimination of one equivalent of H 2 . The molecule is dimeric adducts Et 2 O/THF × Me 2 AlNR-NRЈRЈЈ (5-7) were obtained by deprotonating the respective hydrazines with nBuLi, and features an (AlHLiH) 2 eight-membered ring. In contrast, the reaction of tBu(H)N-N(H)SiMe 3 with LiAlH 4 in the followed by reaction with Me 2 AlCl. The hydrazines Ph(H)N-N(SiMe 3 ) 2 and tBu(H)N-N(H)SiMe 3 react with LiAlH 4 in the presence of THF leads to the formation of dimeric 2 THF × LiAlH 2 [(tBu)N-N(SiMe 3 )] (9) with a central (AlNN) 2 six-presence of either ether or THF with the formation of dimeric lithium hydrazino(hydrido)aluminates, e.g. 8 and 9. Their membered ring. A dimeric aluminium hydrazide 10 was obtained by allowing tBu(Li)N-N(H)SiMe 3 to react with structures depend on the number of acidic hydrogen atoms bonded to the nitrogen atoms of the starting hydrazine. The Me 2 AlCl in a hexane/toluene solution. The structure of 10 features a six-membered Al 2 N 4 ring in chair conformation. hydrazine Ph(H)N-N(SiMe 3 ) 2 (1) reacts with LiAlH 4 to form