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Reactivity of Interstitial Cl− Anions in Synthetic Hydrotalcite-Like Materials in the Halide Exchange Reaction with Alkyl Halides

Published online by Cambridge University Press:  15 February 2011

Esteban López-Salinas ,
Yoshio Ono  and
Eiichi Suzuki
Esteban López-Salinas
Affiliation:
Instituto Mexicano del Petróleo, Gerencia de Catálisis y Materiales, Eje Central Lázaro Cárdenas 152, CP 07730 México, D.F.
Yoshio Ono
Affiliation:
Instituto Mexicano del Petróleo, Gerencia de Catálisis y Materiales, Eje Central Lázaro Cárdenas 152, CP 07730 México, D.F.
Eiichi Suzuki
Affiliation:
Tokyo Institute of Technology, Department of Chemical Engineering, Ookayama, Meguroku, 152 Tokyo, Japan
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Abstract

Two types of synthetic hydrotalcite-like [Mg6Al2(OH)16 ][An−%D;2/n (HT) were prepared where A = Cl− anions (Cl-HT), and NiC42− complex anions (NiCl-HT), in order to examine: (1) the reactivity of Cl− anion (or ligand) towards alkyl halides and (2) their catalytic behavior in the Finkelstein reaction. For instance, 0.4 g of NiCl-HT (Cl−: 1.41 mmol) suspended in 20 cm3 of toluene with 14.1 mmol of butyl bromide at 373 K yielded 42 % butyl chloride after 15 min of reaction. In comparison, NiCl4(Et4N)2 (precursor to prepare NiCl-HT) yielded at the same conditions only 2.4 % of butyl chloride. This indicates a great mobility of Cl− in the interlayer region of HTs. The reaction rate is greatly accelerated using DMF instead of toluene and butanol totally suppressed it. This is consistent with a SN2 mechanism. The halide-exchange reaction between benzyl chloride and butyl bromide is catalyzed by both Cl-HT and NiCl-HT.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 368: Symposium T – Synthesis and Properties of Advanced Catalytic Materials , 1994 , 363
Copyright
Copyright © Materials Research Society 1995

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References

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