Vinyliden-Übergangsmetallkomplexe

AISeC2H (AI=K, Rb, Cs): Crystalline Compounds with the Elusive −Se‐C≡C‐H Anion

“…Thee ase,w ith which selenium is inserted into the ionic A I ···C bond, is surprising.H owever,s uch MÀCi nsertion reactions of selenium are not unprecedented for alkynyls M(-C C-R) n with R ¼ 6 Ha nd M = Li, [25,26] Cd [27] and their vinylidene tautomers with M = Rh. [28] KSeCN is also easily prepared by reacting grey selenium with am elt of KCN. [29] Nonetheless,itisremarkable that selenium is already inserted into the ionic A I ···C bond of A I C 2 Ha tt emperatures of approx.…”

AISeC2H (AI=K, Rb, Cs): Crystalline Compounds with the Elusive −Se‐C≡C‐H Anion

“…The ease, with which selenium is inserted into the ionic A I ⋅⋅⋅C bond, is surprising. However, such M−C insertion reactions of selenium are not unprecedented for alkynyls M(‐C≡C‐R) n with R≠H and M=Li, Cd and their vinylidene tautomers with M=Rh . KSeCN is also easily prepared by reacting grey selenium with a melt of KCN .…”

Organic derivatives of monocoordinated tellurium

“…Metal complexes have also been used to stabilise chalcogenoketenes including telluroketenes. 39 Complexes 38 as well as their sulfur and selenium analogues have been synthesised in relatively high yields (68% ± 87%) by the reaction of vinylidene rhodium complexes 37 with chalcogens in benzene. Methylation of 38 (R = H) with methyl triflate and subsequent treatment with NH 4 PF 6 results in the formation of an ionic complex 39.…”

“…Methylation of 38 (R = H) with methyl triflate and subsequent treatment with NH 4 PF 6 results in the formation of an ionic complex 39. 39 Finally, we would like to mention the synthesis of tellurocarbonyl complex 41a (X = Te) in which the C=Te group acts as a carbonyl ligand. 40 The complex 41a as well as its sulfur (41b) and selenium (41c) analogues were obtained as crystals, stable in air, on treatment of osmium dichlorocarbene complex 40 with HX 7 anions (X = S, Se, Te).…”