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ChemInform Abstract: Catalytic and Stoichiometrically Directed Synthesis of Less Accessible Bromothiophenes and Bromobithiophenes. Trapping and Characterization of Catalytic Intermediates of trans-PdBr(C4H4-nBrn-1S-C) (PPh3)2 (n = 1—4), trans-PdBr(C8H4BrS2-C) (PPh3)2, and trans,trans-Pd2Br2 (μ-C8H6-nBrn-2S2-C,C′) (PPh3)4 (n = 2, 4).

✍ Scribed by Y. XIE; B.-M. WU; F. XUE; S.-C. NG; T. C. W. MAK; T. S. A. HOR

Publisher
John Wiley and Sons
Year
2010
Weight
40 KB
Volume
30
Category
Article
ISSN
0931-7597

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✦ Synopsis

Catalytic and Stoichiometrically Directed Synthesis of Less Accessible Bromothiophenes and Bromobithiophenes. Trapping and Characterization of Catalytic Intermediates of trans-PdBr( C 4 H 4-n Br n-1 S-C) (PPh 3 ) 2 (n = 1-4), trans-PdBr(C 8 H 4 BrS 2 -C) (PPh 3 ) 2 , andtrans,trans-Pd 2 Br 2

-Isomerically pure bromothiophenes and bromobithiophenes, important intermediates for the synthesis of glassy materials, conducting polymers and biologically active compounds, can be conveniently prepared by Pd-catalyzed hydrodebromination. The extend of debromination is controlled by stoichiometry. Some catalytic intermediates are isolated and characterized by X-ray analysis.

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