Abstract
The bismuth-catalyzed urethane reaction is significantly accelerated by generating heterobimetallic mixtures of bismuth and lithium carboxylates.
Highlights
Organotin compounds are important catalysts for the synthesis of polyurethanes consisting of aliphatic isocyanates and polyols
Structural and spectroscopic results reveal the spontaneous formation of heterobimetallic complexes consisting of two bismuth and four lithium carboxylates that show dynamic behaviour in solution
The mechanism of the bismuth-catalyzed urethane reaction was elucidated in detail using quantum chemical calculations, paving the way for a rational catalyst design
Summary
Structural and spectroscopic results reveal the spontaneous formation of heterobimetallic complexes consisting of two bismuth and four lithium carboxylates that show dynamic behaviour in solution. Single crystals X-ray diffraction studies revealed the formation of isostructural complexes 7, 7′, 8, 9 and 9′ with the general formula [Bi2Li4(O2CR)2(μ-O2CR)4(μ3-O2CR)2(μ4O2CR)2(MeCN)2], consisting of two bismuth carboxylates, four lithium carboxylates and two acetonitrile ligands (Fig. S58– S62†).
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