Darstellung und Reaktionen von 1,1,2,2-Tetraborylethan-Derivaten

✍ Scribed by Frankhauser, Pascal ;Kuhlmann, Frank ;Krämer, Albrecht ;Pritzkow, Hans ;Siebert, Walter

• Publisher: Wiley (John Wiley & Sons)
• Year: 1993
• Tongue: English
• Weight: 751 KB
• Volume: 126
• Category: Article
• ISSN: 0009-2940
• DOI: 10.1002/cber.19931260605

✦ Synopsis

Synthesis and

Reactions of lJ.2.2-Tetraborylethane Derivatives * Reaction of (Z)-1,2-bis(dichloroboryl)ethene with B2C14 leads to l,l,Z,Z-tetrakis(dichloroboryl)ethane ( l a ) in 90% yield. Substitution of the chlorine atoms in l a results in the formation of the iodo and amino derivatives 1 b and 1 c, d. Compound 1 b reacts with alkynes to give the 2,2'-linked 2,3-dihydro-1,3-diborole derivatives 2b, c which are aminated to yield 2d, e. Dehalogenation of 1 d leads to the organoboron C2B4 cage 3d. The heterobicyclic compound 4d with two fused phosphadiborolane rings is obtained from Id and LiPH2. Reaction of 4d with (C0)3Fe(C8H14)2 gives the unusual diiron complex 5d. The constitutions of the new compounds are derived from spectroscopic data and are proven for 2e, 4d and 5d by X-ray structure analyses. '3C-NMR Spektren: 1 c zeigt im 13C('H)-NMR-Spektrum fur die B-gebundenen C-Atome ein unstrukturiertes, relaxationsverbreitertes Signal rnit einer Halbhohenbreite von