Reaction between Cl2AlCH2CH2AlCl2 and BCl3 leads to Cl2BCH2CH2BCl2, in which halogen exchange is achieved by Bl3 to yield I2BCH2CH2BI2 (5). Redox reaction between butyne-2 and 5 results in the formation of 1,4-diiodo-2,3-dimethyl-1,4-diboracyclohexene-2 (1a) and iodine. Methylation of 1 a with AlMe3 leads to the title compound 1 d , established by 1H, 11B, 13C NMR. Heating of 1 d in toluene at 160 °C in a sealed tube results in an intramolecular isomerization to give 1,2,3,4,5-pentamethyl-2,3-dihydro-1,3-diborole (2d) in 90% yield.
Bis(cyc1ooctadien)platin reagiert mit dem 2,3-Dihydro-I H-l,3-diborol-Derivat l a zu den isomeren 16-VE-Komplexen 2a und 3a; mit 1 b und 1 c entstehen die 30-VE-Tripeldecker 4b und 4c. 2a ist der erste Komplex mit 1 a als Zweielektronendonor. Die Rontgenstrukturanalysen von 2a,3a und 4c ergeben nichtebene Borheterocyclen.
Diborylethene Compounds as Ligands in
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