Ein neuer Zugang zum ikosaedrischencloso-NB11-Gerüst

✍ Scribed by Schneider, Lenka ;Englert, Ulli ;Paetzold, Peter

• Publisher: Wiley (John Wiley & Sons)
• Year: 1994
• Tongue: English
• Weight: 346 KB
• Volume: 127
• Category: Article
• ISSN: 0009-2940
• DOI: 10.1002/cber.19941270113

✦ Synopsis

A Novel Access to the Icosahedral closo NB~11~ Skeleton

At 200°C, the open skeleton of NB~9~H~12~ is closed to the icosahedral skeleton of NB~11~H~10~Y (3) by the action of three equivalents of Et~3~N · BH~3~, whereby one equivalent forms a bridge Y = BH~2~NEt~2~CH~2~CH~2~ between the adjacent cluster atoms N1 and B2; the product 3 crystallizes in the space group P¯. With L · BH~3~ (L = NMe~3~, SMe~2~) instead of Et~3~N · BH~3~, the nido‐borane NB~9~H~12~ is transformed into the closo‐borane (LBH~2~)NB~11~H~11~ (4a, b) at 140°C. By allowing __t__BuNH~2~ to react with 4b, the N‐bonded ligand Me~2~SBH~2~ is removed with formation of the aza‐closo‐dodecaborate [t BuNH~3~] [NB~11~H~11~], thus opening a new route to closo‐NB~11~H~12~.