Structural Diversity of Ethylzinc Carboxylates

Organometallics, 2015, 34, 4959–4964.


Structural Diversity of Ethylzinc Carboxylates

Agnieszka Grala,a Małgorzata Wolska-Pietkiewicz,a Anna Wojewódzka,a Monika Dabergut,a Iwona Justyniak,b Janusz Lewiński*ab

Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland

DOI: 10.1021/acs.organomet.5b00557.
First published online 21 Sep 2015

The synthesis and structural characterization of a new series of ethylzinc carboxylates are reported. Structurally diverse complexes were derived from three monofunctional carboxylic acids with different numbers of phenyl groups on the α-carbon, and two bifunctional carboxylic acids with a neutral donor terminus, namely methoxyacetic and diethylphosphonoacetic acids. Donor solvents are commonly used in various transformations of alkylzinc carboxylates, therefore the effect of THF as a donor solvent on the reaction outcome was also investigated. Reactions of equimolar amounts of Et2Zn and the selected carboxylic acid in a THF solutions gave ethylzinc carboxylates with a large variety of structures. In the cases of triphenylacetic and diphenylacetic acids, a THF solvated products of stoichiometry [EtZn(O2CR)(THF)] were isolated as a dimer and a 1D coordination polymer, respectively, whereas with methoxyacetic acid, a novel solvent-free hexanuclear structural motif with a butterfly-like framework was formed, ([EtZnO2CCH2OCH3]6. The corresponding reaction with diethylphosphonoacetic acid produced a rare example of a nonanuclear organozinc oxo carboxylate cluster, [(EtZn)8Zn(μ3-O)2(O2CCH2(O)P(OEt)6)].


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