Tetrachlorocyclopentadienoneiron tricarbonyl

Komplexchemie perhalogenierter Cyclopentadiene und Alkine

“…Das letztere ist wohl mit ein Grund, warum ihre Komplexchemie nut wenig untersucht wurde. Wahrend einige Reaktionen mit RC~---CX (R 4: X = Hal) [3][4][5][6] und auch mit X~CX (X = C1, Br, I) [6][7][8][9][10] bekannt geworden sind, ist unseres Wissens die Komplexchemie von 1-Fluoralkinen vNlig unerforscht geblieben. Wir berichten hier tiber den ersten ~r-Komplex von Monofluoracetylen und die Reaktion von C1C~-CC1 mit Pt(PPh3)z(CzH4).…”

Synthesis and property of BrCCH- and BrCCBr-coordinated tetrairon clusters

“…However, the coordination chemistry of haloalkyenes has yet to be explored in detail [2]. Most haloalkyne-coordinated complexes are synthesized through a substitution reaction between transition-metal complexes and haloalkynes.…”

“…For example, [WCl 4 (BrC"CBr)] 2 is formed by the reaction of BrC"CBr with WCl 6 in the presence of C 2 Cl 4 in boiling carbon tetrachloride [2b], and the treatment of Pt(PPh 3 ) 4 with ClC"CCl at À30°C affords Pt(ClC"CCl)(PPh 3 ) 2 in good yield, which can be further converted to trans-PtCl(C"CCl) ( boiling toluene [2d]. For M n transition-metal clusters (n > 2), only one example of synthesis has been reported, in which Cp*CoFe 3 (CO) 9 (l 4 -g 2 -FC"CF) was obtained by irradiating a mixture of Fe 3 (CO) 9 -(l 3 -CF) 2 and Cp*Co(CO) 2 [2e]. The reactivity of these complexes and clusters thus remains largely unknown.…”

“…Results and discussion 2.1. Bromination of acetylenic protons in (g 5 -C 5 H 4 Me) 4 Fe 4 (HCCH) 2 (1) 2.1.1. Reaction of (g 5 -C 5 H 4 Me) 4 Fe 4 (HCCH) 2 with NBS Treatment of (g 5 -C 5 H 4 Me) 4 Fe 4 (HCCH) 2 (1) with 1 equiv.…”

“…Treatment of the isolated one-electron cationic form [1](OTf) with NBS resulted in the formation of [(g 5 -C 5 H 4 Me) 4 Fe 4 (HCCH)(HCCBr)](OTf) ( [2](OTf), 91%) and succinimide (82%) (Scheme 1). Further treatment with NBS led to the stepwise bromination of two acetylene ligands to give [(g 5 -C 5 H 4 Me) 4 Fe 4 (BrCCBr) 2 ](OTf) ( [5]OTf).…”