ISSN:
0009-2940
Keywords:
Diallenylboranes
;
1,5-H Shift
;
Boron heterocycles
;
Borole cobalt complex
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Diallenylboranes as Starting Molecules for Boron HeterocyclesThe reaction of allenyllithium with chloro(dialkylamino)bornanes leads to the diallenylboranes 1, 2a, 3a, b, and 4 in 58-80% 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.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19921250903
