Polyfunctional Metal Carbenes for Organic Synthesis

Trapping the Dirhenium Alkynyl Fischer Type Carbene through Michael Addition. Unexpected Room-Temperature E/Z Isomerization of (CO)5Re(CO)4Re(C(OMe)CHC(NMe2)TMS)

“…Since the discovery by Fischer and Maasböl, transition-metal-stabilized carbene complexes have been attracting attention from numerous fundamental and applied viewpoints. After a short period of their very limited applications, they became extremely attractive tools in organic and organometallic syntheses . Today, due to a large diversity of the processes they are involved in, researchers have classified them as “chemically multitalented compounds” …”

“…Among different types of metal carbenes the α,β-unsaturated alkenyl and alkynyl complexes are especially interesting. Much of this interest has been prompted by their potential to serve as C 2 and C 3 synthons for a large number of [2+] and [3+] cyclizations. 2f, This direction has been initiated by Dötz in the 1970s and first led to the synthesis of numerous naphthoquinone derivatives via cycloaddition of alkynes to metal carbenes. Since then, a large number of other cycloaddition products have been obtained 2f…”