Hydroalumination reactions employing the bulky dialkylaluminum hydride [(Me3Si)2HC]2Al-H - Prevention of secondary reactions
Usually, the hydroalumination of alkynes results in secondary reactions under release of the corresponding trialkylaluminum compounds. In contrast, the monoaddition products of R2Al-H to C≡C triple bonds [R 2Al-(R′)C=C(R″)-H] could be isolated in high yields now by employing the bulky dialkylaluminum hydride [(Me3Si) 2HC]2Al-H (1). This is shown here by two reactions starting with a monoalkyne (Me3C-C≡C-C6H 5) and a dialkyne (Me3C-C≡C-C6H 4-C≡C-CMe3). Both products have the aluminium atoms attached to those carbon atoms of the C=C double bonds which are in the α-position with respect to the phenyl groups. The configuration of the alkenyl groups verifies the cis-addition of the Al-H bonds in all cases.
Uhl, Werner,Matar, Madhat
p. 1177 - 1180
(2008/10/09)
More Articles about upstream products of 878813-10-6