Direct preparation of differentially protected hydroquinone-chromium(tricarbonyl) complexes from the benzannulation reaction of fischer carbene complexes

WCo Discrete Complex Exhibiting Photo‐ and Thermo‐Induced Magnetisation

“…Interestingly, the cyclooctatrienones 3 could also be prepared in a tandem one‐pot process from vinyl‐substituted alkynylchromium carbene complexes 1 20. Thus, upon refluxing complexes 1 with three equivalents of 2,3‐dihydrofuran and the alkyne in THF, the desired products were also obtained, although in slightly lower yields than in the stepwise reaction.…”

Unanticipated formation of ortho-sulfone substituted phenols by anionic thia-Fries rearrangement of (aryl triflate)tricarbonylchromium complexes

“…Some phenyl triflate complexes have been prepared earlier by Wulff and co-workers. [17][18][19][20] Next, an ortho-deprotonation of the aryl triflate with lithium diisopropylamide or with butyllithium was envisaged in order to induce triflate elimination with formation of the respective aryne complexes. Several reaction conditions including in situ quenching with a diene were tested.…”

Eight-Membered Carbocycles from a Dötz-Like Reaction

“…Carbocycles 5 could also be prepared in a tandem one‐pot process from the vinyl‐substituted alkynyl chromium carbenes 1 (Scheme ) 12. Upon refluxing the starting complexes with three equivalents of 2,3‐dihydrofuran and three equivalents of the corresponding alkyne in THF, the desired products were obtained in slightly lower yields compared to those of the stepwise reactions 13…”