10.1021/om0499409
The study investigates the activation volumes of substitution reactions on neutral and cationic organometallic platinum(IV) complexes, providing evidence for selective associative activation. The researchers focused on a series of Pt(IV) sulfide organometallic complexes, examining how the electronegativity of the substitution-inert spectator ligands influences the reaction mechanisms, which can be either associatively or dissociatively activated. The chemicals used in the study included various platinum complexes with different ligands, such as 1FSMe, 1ClSMe, 1BrSMe, 2ClSMe, 2ClSEt, 2ClSBzl, 2ClPPh, 2Clpy, 3FSMe, and 4MePPh, as well as entering ligands like PPh3 and SMe2. These chemicals served to explore the tunable associatively/dissociatively activated mechanisms and to understand the effects of ligand size, electronic properties, and solvent interactions on the activation volumes and reaction pathways. The purpose was to gain insights into the mechanisms of substitution reactions involving platinum complexes, which are relevant to catalytic cycles and C-H bond activation processes.
10.1002/anie.200803269
The research focuses on the cis-selective single-cleavage skeletal rearrangement of 1,6-enynes in metal-catalyzed cycloisomerizations, aiming to reveal the multifaceted character of the intermediates involved in these reactions. The study explores the factors controlling the selectivity in the rearrangement of 1,6-enynes, which can lead to different types of products depending on the catalyst used. The researchers concluded that the cis-selective single-cleavage rearrangement of enynes has revealed an unrecognized aspect of gold intermediates in cycloisomerization and related reactions of enynes, where reactions are generally stereospecific but become non-stereospecific in the presence of strongly electron-donating substituents. The chemicals used in the process include various 1,6-enynes, gold catalysts such as AuCl, AuCl(oTol3P), and cationic AuI catalysts, as well as other metal catalysts like PtCl4, GaCl3, and InCl3.