Cooperative Trimerization of Carbon Monoxide by Samarium and Lithium Boryls

摘要

On exposure to CO at low temperature, a samarium boryl complex afforded a boryl oxycarbenc complex. The reaction of the lithium boryl complex with CO gave a bicyclic product, which is composed of tetra-CO units. In contrast, in the coexistence of a samarium boryl complex and a lithium boryl complex, the trimerization of CO selectively occurred to give a diborylallenetriolate skeleton via the cooperation of samarium and lithium species.