PUB - Publikationen an der Universität Bielefeld

The metallophosphaalkene [eta]5-C5Me5)(CO)2Fe-P=C(NMe2)2 (1) was converted into the stable metallated 1-phospha-1,3-butadiene, [eta]5-C5Me5)(CO)2Fe-P=C(E)=C-C(E)=C(NMe2)2 5a) and the [3+2]-cycloadduct ([eta]5-C5Me5)(CO)Fe-C(O)-C(E)=C(E)-P=C(NMe2)2 (4 a) by treatment with the alkyne E-C[triplebond]C-E (E = CO2Me). A similar reaction of 1 with Me-C[triplebond]C-E (E = CO2Me) resulted in the formation of the 1,2-dihydrophosphete ([eta]5-C5Me5)(CO)2Fe-PC(=CH2)-C(E)=C-NMe2 (6). The cycloadduct ([eta]5-C5Me5)(CO)Fe-C(O)-C[C(O)tBu]=C(Ph)-P=C(NMe2)2 (4c) was the sole tractable product from the reaction of 1 with the alkyne Ph-C[triplebond]C-C(O)tBu. The compounds 4a-c, 5a, b and 6 have been characterized by elemental analysis as well as by spectroscopic data (IR, 1H,13C, 31P NMR, MS). The molecular structures of 4a, 5a and 6 have been determined by single crystal X-ray analysis.