title: Cu3(BTC)2catalyzed dehydrogenative coupling of dimethylphenylsilane with phenol and homocoupling of dimethylphenylsilane to disiloxane.
abstract: Cu3(BTC)2(BTC: 1,3,5-benzenetricarboxylic acid) showed to be an efficient and reusable heterogeneous solid catalyst for the formation of SiO bond through dehydrogenative coupling of dimethylphenylsilane (1) with phenol under mild reaction conditions. It is observed that Fe(BTC), MIL-101(Cr) and UiO-66(Zr) are not able to promote this cross coupling between 1 and phenol. Cu3(BTC)2exhibits higher stability and activity compared to other MOFs studied here. Furthermore, Cu3(BTC)2is reused for three consecutive cycles with a slight decay in its activity. Comparison of the powder XRD patterns of the fresh with three times used Cu3(BTC)2showed no significant difference in the crystalline structure, thus, indicating the catalyst stability under the optimized reaction conditions. Furthermore, EPR, FT-IR and SEM images of the fresh and reused Cu3(BTC)2did not show any change in the oxidation state of copper or structural morphology. Also, no leaching of copper is detected under optimized reaction conditions. In addition, Cu3(BTC)2showed higher activity compared to Pt, Pd, Au and Cu supported on active carbon as heterogeneous catalysts in the synthesis of disiloxane from 1 through SiH activation.
authors.affiliation: School of Chemistry, Madurai Kamaraj University, Madurai 625021, India.
authors.forename: Nagaraj
authors.initials: N
authors.lastname: Anbu
authors.affiliation: School of Chemistry, Madurai Kamaraj University, Madurai 625021, India. Electronic address: admguru@gmail.com.
authors.forename: Amarajothi
authors.initials: A
authors.lastname: Dhakshinamoorthy
keywords: Cu(3)(BTC)(2); Green chemistry; Heterogeneous catalysis; SiO coupling; Silanes