Synthesis of zinc trisubstituted hydrazido complexes and ortho-metalation of 4-(dimethylamino)pyridine
- 26 October 2010
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Dalton Transactions
- Vol. 39 (47), 11439-11444
- https://doi.org/10.1039/c0dt00847h
Abstract
The zinc hydrazide complexes [EtZn(N(SiMe3)NMe2)]2 , [EtZn(N(Me)NMe2)]4 , and Zn3Et4(N(Et)NMe2)2 were synthesized by allowing excess hydrazine, HN(R)NMe2 , to react with diethyl zinc. The product of the reaction between ZnEt2 and HN(i-Pr)NMe2ortho-metalated 4-(dimethylamino)pyridine (DMAP) at room temperature, producing the complex Zn[(NC5H3-p-NMe2)ZnEt(N(i-Pr)NMe2)]2. At elevated temperatures, Zn3Et4(N(Et)NMe2)2 also ortho-metalated DMAP, but [EtZn(N(Me)NMe2)]4 did not. Single-crystal X-ray diffraction studies revealed that the hydrazide ligands in [EtZn(N(SiMe3)NMe2)]2 act as bridging mono-hapto amide ligands, and in Zn3Et4(N(Et)NMe2)2 and Zn[(NC5H3-p-NMe2)ZnEt(N(i-Pr)NMe2)]2 the hydrazide ligands are di-hapto.Keywords
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