Abstract
The oxidation of Ru(dppe)(CO) 3 with various o- and p-quinones is described. Reaction with 3,5-di- t-butyl- o-benzoquinone yielded a metallacyclic complex which crystallizes in the monoclinic space group P2 1/ c with a=21.8388 (1), b=12.0734 (1), c=17.6173 (3) Å, β=105.549 (1), and Z=4. The complex exhibited slightly distorted octahedral geometry and contained a puckered metallacyclic ring resulting from the formal addition of the o-quinone moiety across the Ru–C bond of a metal carbonyl. Reaction of this quinone adduct with an alkylamine produced a known bis(carbamoyl) complex, Ru(dppe)(CO) 2[C(O)NHR] 2. The reaction of Ru(dppe)(CO) 3 with p-quinones generated unidentified oxidation products which exhibited a similar reactivity with amines to form bis(carbamoyl) complexes.
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