Synthesen, Struktur und Eigenschaften von 1,2,5-Phosphadiborolanen

✍ Scribed by Frankhauser, Pascal ;Drieß, Matthias ;Pritzkow, Hans ;Siebert, Walter

• Publisher: Wiley (John Wiley & Sons)
• Year: 1994
• Tongue: English
• Weight: 350 KB
• Volume: 127
• Category: Article
• ISSN: 0009-2940
• DOI: 10.1002/cber.19941270208

✦ Synopsis

Syntheses, Structure and Properties of 1,2,5-Phosphadiborolanes Reactions of (Z)-1,2-bis[chloro(diisopropylamino)boryl]ethane with Li2PC6H5 and of 1,2-bis[chloro(diisopropylamino)boryl]-1,2-diisopropylideneethane with [LiPh,.dme] yield the 1,2,5-phosphadiborolanes 1 and 2, respectively. The compounds are characterized by 'H-, I'B-,

and 31P-NMR spectroscopy as well as an X-ray structure analysis of 2. Low-temperature 'H-NMR studies show that the inversion barrier at P is distinctly lower than that of related unsaturated compounds. This might be the result of a favorable B-P-n interaction in the transition state of the inversion at the phosphorus atom. Reaction of 1 with S8 or CS2 leads to the 1,2,5thiadiborolane 3.