The air- and moisture-stable phosphine-free palladium(0) complex 1 is a highly active and recoverable catalyst for Heck olefination of aryl diazonium tetrafluoroborates. The reactions were performed under aerobic conditions at room temperature to give the coupling products in excellent yields. [reaction: see text]

Fifteen-membered triolefinic macrocyclic palladium(0) complex 1, (E,E,E)-1-ferrocenylsulfonyl-6,11-bis[(4-methylphenyl)sulfonyl]-1,6,11-triazacyclopentadeca-3,8,13-trienepalladium(0), is an active and recoverable catalyst for Suzuki-Miyaura cross-couplings between arenediazonium salts and potassium organotrifluoroborates. The reactions were performed under aerobic conditions at room temperature and

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Molecular structures featuring two and three triolefinic 15-membered macrocycles of type 2 as well as their homo- and heterometallic complexes of palladium(0) and platinum(0) (5, 7) have been synthesized from 2,4,6-trichloro-1,3,5-triazine, 1. The strategy employed allows easy preparation of heterobimetallic complexes in a controlled manner. Several mass spectrometry techniques are useful to identify these complexes.

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Two palladium complexes containing triene-coordinated ligands, 3 and 4, open-chain analogues of the macrocyclic palladium(0) complexes of type 1, have been synthesized. A comparative study of both open-chain and macrocyclic complexes has been carried out, based on a NMR and X-ray structural analysis, a DSC thermal behavior assessment, and a catalytical activity evaluation in the arenediazonium and organotrifluoroborate cross-coupling Suzuki-Miyaura reaction. The 1,6,11-triene sequence has been revealed to be crucial in the great stability of this family of palladium(0) complexes.

The coupling reaction of 3-aryl (or heteroaryl) acrylonitriles with several aryl and heteroaryl iodides (Heck reaction) under Jeffery's conditions has been studied as a concept to synthesize, in a stereospecific manner, trisubstituted olefins.