Monosubstituted Keggin as heterogeneous catalysts for solvent-free cyanosilylation of aldehydes and ketones

• Published in: Catalysis communications 2022-11, Vol.171, p.106499, Article 106499
• Main Authors: Yekke-Ghasemi, Zahra, Heravi, Majid M., Malmir, Masoume, Mirzaei, Masoud
• Format: Article
• Language: English
• Subjects: Cyanosilylation; Heterogeneous catalyst; Solvent-free; TMSCN; Zirconium substituted Keggin
• ISSN: 1566-7367; 1873-3905
• DOI: 10.1016/j.catcom.2022.106499

Any successful catalyst should have a dedicated synthesizing route considering their high yields, time-efficient, and do not require any highly toxic chemicals. In this regard, two nano-sized monosubstituted polyoxometalates (POMs) with the well-known Keggin structure were synthesized and characterized: (TBA)4[Zr(OH)PW11O39]·22H2O (TBA-ZrPW11) and (TBA)5[Zr(OH)SiW11O39]·17H2O (TBA-ZrSiW11) (TBA+: tetrabutylammonium). Thus, the catalytic activities of both catalysts were tested in the cyanosilylation reaction without any solvents of various aldehydes and ketones with trimethylsilyl cyanide (TMSCN) over two heterogeneous catalysts. Finally, the recyclability and heterogeneity of these POM-based catalysts were also checked, showing that they remain active at least after three recycling procedures. [Display omitted] •Two lacunary Keggin type polyoxometalates (POM) were synthesized and characterized.•Both POMs were used as catalysts in the solvent-free cyanosilylation reaction.•Both catalysts were recycled up to 3 runs with slight loss of activities.•TBA-ZrPW11 is more effective than TBA-ZrSiW11, due to the presence of P center.