Abstract
A new reaction between chromium(0) and tungsten(0) carbene complexes 1 and alkynyl esters or ketones 2 in the presence of NMO to yield pyran-2-ylidene complexes 3 has been explored. Here, we discuss the scope of the reaction and propose a plausible mechanistic pathway. The method is a new multicomponent approach for the synthesis of pyranylidene carbene complexes.
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