Abstract
Diene-dienophile functionalized Fischer type carbene complexes [(CO) 5W=C(R)]R']are accessible from hexacarbonyl tungsten by a tandem nucleophilic addition/ substitution sequence. Either the diene or the dienophile functionality can be bonded directly to the carbene carbon atom. The synthetic potential of these complexes is demonstrated by furfurylamino(prop-2-enyl)-carbene and diallylamino(furyl) carbene complexes 2 and 11 which - in contrast to their amide analogues - under-go an intramolecular [4+2]cycloaddition under mild conditions. The cycloaddition occurs in a trans mode as is established by X-ray analyses.
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