title: An immobilized symmetrical bis-(NHC) palladium complex as a highly efficient and recyclable Suzuki-Miyaura catalyst in aerobic aqueous media.
abstract: A bis-N-heterocyclic carbene (NHC) functionalized with chloropropyltriethoxysilane over silica was used to synthesize a well-defined immobilized palladium complex. This complex is a suitable and easily retrievable catalyst for Suzuki-Miyaura cross-coupling reactions under mild aqueous conditions. Excellent yields and conversions were obtained with low palladium loadings (down to 0.03 mol% Pd). The catalyst can be reused up to six cycles without the loss of its activity. The catalytic role of the NHC complex of palladium during coupling between bromobenzene and phenylboronic acid was investigated theoretically. The oxidative addition step is predicted to be endothermic in agreement with the experimental conditions.
authors.affiliation: Department of Chemistry, Dibrugarh University, Dibrugarh 786004, Assam, India. dr.pradip54@gmail.com.
authors.forename: Tahshina
authors.initials: T
authors.lastname: Begum
authors.affiliation: Department of Chemistry, Dibrugarh University, Dibrugarh 786004, Assam, India. dr.pradip54@gmail.com.
authors.forename: Manoj
authors.identifier: http://orcid.org/0000-0001-7958-3509
authors.initials: M
authors.lastname: Mondal
authors.affiliation: Department of Chemistry, Dibrugarh University, Dibrugarh 786004, Assam, India. dr.pradip54@gmail.com.
authors.forename: Manash Protim
authors.initials: MP
authors.lastname: Borpuzari
authors.affiliation: Department of Chemistry, Dibrugarh University, Dibrugarh 786004, Assam, India. dr.pradip54@gmail.com.
authors.forename: Rahul
authors.initials: R
authors.lastname: Kar
authors.affiliation: Department of Frontier Materials, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan.
authors.forename: Golap
authors.initials: G
authors.lastname: Kalita
authors.affiliation: Department of Chemistry, Dibrugarh University, Dibrugarh 786004, Assam, India. dr.pradip54@gmail.com.
authors.forename: Pradip K
authors.initials: PK
authors.lastname: Gogoi
authors.affiliation: Department of Chemical Sciences, Tezpur University, Tezpur 784028, Assam, India. utbora@yahoo.co.in ubora@tezu.ernet.in.
authors.forename: Utpal
authors.initials: U
authors.lastname: Bora