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2005
Polyphenylalkyne derivatives
Q 0750
Selective Cross-Coupling of 1-Ethynyl-4-iodobenzenes with Activated Arylacety— Selective cross-coupling of iodobenzene derivative (II) with aromatic com20- 088 lenes.
pounds containing the arylethynyl-activated ethynyl group yields molecules
(IV)—(VI) and higher oligomers. The products, synthesized from (I) and (II) in molar
ratios of 1:1 and 1:2, possess exclusively this structure; no components of other chemotypes are observed. Homocondensation of (II) does not occur. To preclude the possible
partial formation of conjugated diyne structures in the course of isolation of the products, the terminal ethynyl groups are protected with iodoanisole (III). The use of selective cross-coupling for the synthesis of polymers opens the possibility to prepare defect-free poly(p-phenyleneethynylenes) with a given molecular weight and a narrow
molecular-weight distribution. — (KOVALEV*, A. I.; TAKEUCHI, K.; ASAI, M.;
UEDA, M.; RUSANOV, A. L.; Russ. Chem. Bull. 53 (2004) 8, 1749-1754;
Nesmeyanov Inst. Organoelem. Compd., Russ. Acad. Sci., Moscow 117813, Russia;
Eng.) — H. Hoennerscheid
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