NDLI: Kinetics of the Heck reactions of styrene with bromobenzene and iodobenzene in the presence of ligandless catalytic systems: A comparative study

Content Provider	Springer Nature Link
Author	Schmidt, A. F. Smirv, V. V. Al Halaiga, A.
Copyright Year	2007
Abstract	The comparative kinetic study of the Heck reactions of styrene with iodobenzene and bromobenzene has revealed specific features of these reactions that should necessarily be taken into account for the observed data to be interpretable in the framework of a unified mechanistic conception. It has been proved for the styrene-bromobenzene reaction that benzene forms as a by-product via a heterogeneous route and catalytically active Pd(0) undergoes aggregation via an autocatalytic mechanism. The kinetics of the styrene-iodobenzene reaction indicates that benzene in this reaction forms via a homogeneous route, biphenyl forms as another by-product by a bimolecular mechanism, and excessive aryl halide concentration reduces the catalyst formation rate. A nonlinear-law mechanism is suggested for the conjugation of palladium reduction, aggregation, and oxidation in the Heck reaction. This mechanism allows the existence of a “critical” Pd(0) concentration and a “critical” formation rate of this catalytic species above which the catalytic activity begins to decrease.
Starting Page	390
Ending Page	397
Page Count	8
File Format	PDF
ISSN	00231584
Journal	Kinetics and Catalysis
Volume Number	48
Issue Number	3
e-ISSN	16083210
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2007-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Catalysis Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis Modeling and Simulation Computer Science Applications

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