Synthese, Struktur und Reaktivität des Ferrioarsaalkens [(η5-C5Me5)(CO)2FeAs=C(Ph)NMe2]
摘要:
Reaction of equimolar amounts of the carbenium iodide [Me2N(Ph)CSMe]I and LiAs(SiMe3)(2) . 1.5THF afforded the thermolabile arsaalkene Me3SiAs = C(Ph)NMe2 (1), which in situ was converted into the black crystalline ferrioarsaalkene [(eta (5)-C5Me)(Co)(2)FeAs=C(Ph)NMe2)] (2) by treatment with [(eta (5)-CSMe2)(CO)(2)FeCl]. Compound 2 was protonated by ethereal HBF4 to yield [(eta (5)-CsMe5)(Co)(2)FeAs(H)C(Ph)NMe2] BF4 (3) and methylated by CF3SO3Me to give [(eta (5)-C5Me5)(CO)(2)Fe As(Me)C(Ph)NMe2] - SO3CF3 (4). [(eta (5)-C5Me5)(Co)(2)FeAs[M(CO)(n)]C(Ph)NMe2] (5: [M(CO)(n)] = [Fe(CO)(4)]: 6: [Cr(CO)(5)]) were isolated from the reaction of 2 with [Fe-2(CO)PI or [{(Z)-cyclooctene}Cr(CO)(5)], respectively. Compounds 2-6 were characterized by means of elemental analyses and spectroscopy (IR, H-1, C-13{H-1}-NMR). The molecular structure of 2 was determined by X-ray diffraction analysis.