REACTION OF HETEROCUMULENES R-N=C=N-R AND R-P=C=P-R WITH A DIIRON AMINOCARBENE COMPLEX

Reaction of R-N=C=N-R (R=p-Me-C6H4) and R-P=C=P-R (R=2,4,6-(t)Bu(3)C(6 )H(2)) with the di-iron aminocarbene complex [Fe-2(CO)(7){mu-C(Ph)C(NE t(2))}] (1c) gave corresponding complexes CO)(6){C(Ph)C(NEt(2))C(NC(6) H(4)Me)N(C(6)H(4)Me)}] (2) and C(NEt(2))C(PC(6)H(2)(t)Bu(3))P(C(6)H(2) (t)Bu(3))}] (4), resulting from a coupling reaction with carbon-carbon bond formation. O)(5)(CNC(6)H(4)Me){C(Ph)C(NEt(2))N(C(6)H(4)Me)}], co mplex 3, obtained in the reaction with R-N=C=N-R, resulted from C=N bo nd rupture and insertion of a nitrene fragment into the Fe=C bond. Com plexes 2-4 were characterized by X-ray diffraction. The different geom etries of complexes 2 and 4 are discussed. The formation of these comp lexes may be explained by cycloaddition on the Fe=C metal-carbene bond .