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Opposite Effects of Added AsPh3 Reveal a Drastic Mechanistic Switch in RhI/AuI Transmetalations via Rh–Au Bonded Intermediates
Introduction Click to copy section linkSection link copied! A most common transmetalation in catalysis is R for X exchange (R = organic group on a main group element; X = halide on a transition metal). It usually occurs via μ-X μ-R double-bridged intermediates. For other transmetalations, such as R/R′ exchanges (responsible for undesired homocoupling products), different mechanisms have been reported.
New Insights in the Synthesis of High-Molecular-Weight Aromatic Polyamides-Improved Synthesis of Rod-like PPTA
2.1. Optimization of the Polyamidation Reaction In order to obtain aromatic polyisophthalamides, the in situ silylation of aromatic diamines was employed. (Details about the synthesis of polyisophthalamides are shown in Supporting Information, Section S1.) The isophthalic acid-derived aramids are much more soluble than rod-type aramids, and therefore, existing or non-existing improvements in molecular weight could be more easily detected.
RhIAr/AuIAr′ Transmetalation: A Case of Group Exchange Pivoting on the Formation of M−M′ Bonds through Oxidative Insertion
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