142363-07-3Relevant academic research and scientific papers
Diallenylboranes as Starting Molecules for Boron Heterocycles
Enders, Markus,Pritzkow, Hans,Siebert, Walter
, p. 1981 - 1986 (2007/10/02)
The reaction of allenyllithium with chloro(dialkylamino)bornanes leads tio the diallenylboranes 1, 2a, 3a, b, and 4 in 58-89percent yield.Attempts to obtain the B-tert-butyl derivative 2b resulted in the formation of the unusual bicyclo compound 9.Heating of 1 in toluene gives the intermediate borole derivative 5, which dimerises to the diels-Alder product 5'.Reaction of 1 with (C5H5)Co(C2H4)2 leads to the cobalt-borole complex 6.No 1,5-H shift occurs on heating 2a and 3, respectively.Heating of 4 in mesitylene yields the dibora tricyclus 7, which undergoes a photochemical 1,5-H shift to 8. single crystal X-ray structure determinations of 7, 8, and the complex 6 confirm their constitutions. Key words: Diallenylboranes / 1,5-H Shift / Boron heterocycles / Borole cobalt complex
