Reactions of Bis(alkyl)yttrium Complexes Supported by Bulky N,N Ligands with 2,6-Diisopropylaniline and Phenylacetylene

The reactions of bis(trimethylsilylmethyl)yttrium complexes supported by bulky amidopyridinate (Ap) and amidinate (Amd) ligands (LY(CH2SiMe3)(2)(THF)(n): L = Ap, n = 1 (1); L = Amd, n = 1 (2)) with 2,6-diisopropylaniline and phenylacetylene were performed. The reaction of 1 with an equimolar amount of 2,6-diisopropylaniline occurs with TMS elimination and affords an yttrium alkyl anilido species which was isolated as a DME adduct, ApY(CH2SiMe3)(NH-2,6-(Pr2C6H3)-Pr-i)-(DME) (3). The protonolysis of 3 with phenylacetylene results in the alkynyl anilido derivative ApY(C CPh)(NH-2,6-(Pr2C6H3)-Pr-i)-(DME) (6). The treatment of complexes 3 and 6 with 2,2'-bipy leads to the formation of the bis(anilido) derivative ApY(NH-2,6-iPr(2)C(6)H(3))(2)(bipy) (5). The formation of a dimeric complex containing two ApY fragments linked by two mu(2)-alkynyl groups and a mu-eta(2):eta(2)-butatrienediyl fragment, [{AmdY(mu(2)-C CPh)}2(mu(2)-eta(2):eta(2)-PhCCCCPh)] (7), was observed in the reaction of 2 with 2 equiv of phenylacetylene.