Cyanosilylation of aldehydes catalyzed by ag(I)-and cu(ii)-arylhydrazone coordination polymers in conventional and in ionic liquid media

The novel Ag(I) and Cu(II) coordination polymers [Ag(μ 3 -1κO;2:3κO’;4κN-HL)] n ∙n/2H 2 O (1) and [Cu(en) 2 (μ-1κO;2κN-L)] n ∙nH 2 O (2) [HL - = 2-(2-(1-cyano-2-oxopropylidene)hydrazinyl)benzene sulfonate] were synthesized and characterized by IR and ESI-MS spectroscopies, elemental and single crystal X-ray diffraction analyses. Compounds 1 and 2 as well as the already known complex salt [Cu(H 2 O) 2 (en) 2 ](HL) 2 (3) have been tested as homogenous catalysts for the cyanosilylation reaction of different aldehydes with trimethylsilyl cyanide, to provide cyanohydrin trimethylsilyl ethers. Coordination polymer 2 was found to be the most efficient one, with yields ranging from 76 to 88% in methanol, which increases up to 99% by addition of the ionic liquid [DHTMG][L-Lactate]. © 2019 by the authors. Licensee MDPI, Basel, Switzerland.