Intramolecular carbyne-carbyne coupling on exposure of [μ3-η1-CR1][μ3-η1-CR2][CpCo]3 clusters to sulphur and selenium: A novel synthesis of 1-cobalta-2,5-diheterocyclopent-3-enes

Synthesis, Structure, and Dissociation Equilibrium of [Co(η5-C5H5)(Se2C6H4)]2, a Novel Metalladiselenolene Complex

“…Electron transfer can be made easily at the metal and chalcogen sites of the aromatic ring, leading to various reactivities . Contrary to the vast chemistry of [Co(η 5 -C 5 H 5 )(S 2 C 2 R 2 )]-type cobaltadithiolene complexes, cobaltadiselenolene has been studied little, if at all . In this paper, we report the first synthesis of a representative cobaltaladiselenolene as a dimeric form, [Co(η 5 -C 5 H 5 )(Se 2 C 6 H 4 )] 2 ( 1 ), and its crystallographic structure and dissociation reaction.…”

Rhodium-Catalyzed Isomerization and Alkyne Exchange Reactions of 1,4-Dithiins via the 1,2-Ethenedithiolato Rhodium Complex

“…A 1,4-dithiin coordinates through two sulfur atoms to form intermediate A with release of alkyne 3 . Then, oxidative addition provides 1,2-ethenedithiolato rhodium intermediate B , and the coordinated alkyne isomerizes from B to B′ . Subsequently, reductive elimination provides an isomeric 1,4-dithiin via formation of A′ , and the coordination of 3 regenerates the rhodium­(I) catalyst.…”

“…These rhodium-catalyzed reactions are considered to involve 1,2-ethenedithiolato rhodium intermediates. Studies of the catalytic reaction of the 1,2-ethenedithiolato rhodium complex have been limited . The η 5 -cyclopentadienyl (1,2-dimethoxycarbonyl-1,2-ethylenedithiolato- S,S )rhodium complex [CpRh­(S 2 C 2 Z 2 ), where Z = CO 2 Me] was proposed to be an intermediate in the catalytic formation of 2,3,4,5-tetra­(methoxycarbonyl)­thiophene from dimethyl acetylenedicarboxylate and sulfur .…”