Carbon Nanotube-Supported Butyl 1-Sulfonic Acid Groups as a Novel and Environmentally Compatible Catalyst for the Synthesis of 1,8-Dioxo-octahydroxanthenes.

Parvanak Keveh Boroujeni,Reza Khalifeh,Zahra Heidari

doi:10.17344/acsi.2016.2291

Parvanak Keveh Boroujeni, Reza Khalifeh + Show 1 more

Open Access

https://doi.org/10.17344/acsi.2016.2291

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Journal: Acta chimica Slovenica	Publication Date: Sep 15, 2016
Citations: 8	License type: cc-by

Affiliation: Shahrekord University

Abstract

A novel multiwalled carbon nanotube catalyst with -SO3H functional groups was easily prepared from its starting materials and used as an efficient heterogeneous catalyst for one-pot Knoevenagel condensation, Michael addition, and cyclodehydration of 5,5-dimethyl-1,3-cyclohexanedione (dimedone) with various aromatic aldehydes. Using this method 1,8-dioxo-octahydroxanthenes were obtained in excellent yields at room temperature. The present method is superior in terms of reaction temperature, reaction time, easy work-up, high yields, and ease of recovery of catalyst.

Highlights

Carbon nanotubes (CNTs) have been considered as good supports for homogeneous and heterogeneous catalysts.[1,2,3] When compared to other commonly used supports in heterogeneous catalysis, carbon nanotubes (CNTs) present the advantage of extraordinary electrical, thermal, and mechanical strength characteristics, resistance to chemical attack in acidic and basic media, high surface areas, and low cost
In a continuation of our recent work on synthesis and application of heterogeneous catalysts in organic reactions,[25,26,27,28] we report the synthesis of multiwalled carbon nanotube-supported butyl 1-sulfonic acid groups (MWCNT–BuSO3H) from the reaction of the salt
A chemical vapour deposition (CVD) method was used for the synthesis of MWCNT.[1]

Summary

Introduction

Carbon nanotubes (CNTs) have been considered as good supports for homogeneous and heterogeneous catalysts.[1,2,3] When compared to other commonly used supports in heterogeneous catalysis, CNTs present the advantage of extraordinary electrical, thermal, and mechanical strength characteristics, resistance to chemical attack in acidic and basic media, high surface areas, and low cost. Synthesis of 1,8-dioxo-octahydroxanthenes is generally achieved by the condensation of dimedone with aldehydes. In a continuation of our recent work on synthesis and application of heterogeneous catalysts in organic reactions,[25,26,27,28] we report the synthesis of multiwalled carbon nanotube-supported butyl 1-sulfonic acid groups (MWCNT–BuSO3H) from the reaction of the salt

Results

Conclusion