Olefin–acetylene metal complexes. The formation of some 1,4-diene complexes of rhodium(I) by the reactions of rhodium(I) olefin–hexafluorobut-2-yne complexes with 2,4-dimethylpenta-2,3-diene, propene, and cyclopropane
Abstract
The reactions of the olefin–acetylene metal complexes [Rh(tmhd)(L)(CF3CCCF3)](L = ethylene, cycloheptene, or cyclo-octene; tmhd = 2,2,6,6-tetramethylheptane-3,5-dionate) with cyclopropane afford the 1,4-diene complex [Rh(tmhd){1–2-η:4–5-η-CH2CHCH2C(CF3)CHCF3}] which can also be obtained by the reaction of [Rh(tmhd)(C2H4)(C4F6)] with propene at 50 °C. The reactions of tetramethylallene with the complexes [Rh(O–O)(L)(C4F6)](O–O = tmhd, L = C2H4, cycloheptene, or cyclo-octene; O–O = pentane-2,4-dionate, L = C2H4) at room temperature afford the 1,4-diene complexes [Rh(O–O){1–2-η:4–5-η-CH2CMeC(CMe2)C(CF3)CHCF3}]. The complexes [Rh(tmhd){1–2-η:4–5-η-CH2CHCH2C(CF3)CHCF3}] and [Rh(tmhd){1–2-η:4–5-η-CH2CMeC(CMe2)C(CF3)CHCF3}] react with carbon monoxide to give [Rh(tmhd)(CO)2].