Isobutylberyllium hydride: co-ordination complexes and reactions with olefins. The NNN′N′-tetramethylethylenediamine complex of beryllium hydride
- 1 January 1969
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 1008-1012
- https://doi.org/10.1039/j19690001008
Abstract
Elimination of one molar proportion of 2-methylpropene from di-t-butylberyllium gives a mixture of iso- and t-butylberyllium hydrides. Isobutylberyllium hydride results from the pyrolysis of di-isobutylberyllium or its ether complex; it is a glass, soluble in benzene in which it is extensively associated. Di-t-butylberyllium slowly isomerizes to di-isobutylberyllium at room temperature. The tetrahydrofuran complex of isobutylberyllium hydride is a dimer (BuiBeH,THF)2 in benzene, but the tetramethylethylenediamine (TMED) complex, Bui 2Be2H2,TMED, is monomeric. For the reactions of pent-1-ene with BuiBeH, BuiBeH,OEt2, and BuiBeH,NMe3 under similar conditions t½ are in the ratio 1 : 40 : 110. The preparation of Be2H4,TMED, from TMED and the product obtained by pyrolysis of Bu2 iBe,OEt2 beyond the BuiBeH stage is described. The terminal Be–H stretching vibrations result in a strong sharp doublet in the i.r. spectrum at 1787 and 1807 cm.–1.Keywords
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