Cycloaddition Reactions of the Diphosphenyl Complex (η5-C5Me5)(CO)2Fe-P=P-Mes* (Mes* = 2,4,6-tBu3C6H2) with Hexafluoroacetone. X-Ray Structure Analyses of (η5-C5Me5)(CO) Fe P(=PMes*)OC(CF3)2CO and (η5-C5Me5)(CO)2FePP(Mes*)OC(CF3)2

Weber L, Buchwald S, Lentz D, Preugschat D, Stammler H-G, Neumann B (1992)
Organometallics 11(7): 2351-2353.

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Abstract
The diphosphenyl complex (eta-5-C5Me5)-(CO)2Fe-P=P-Mes* (Mes* = 2,4,6-tBu3C6H2) undergoes a [3 + 2] dipolar cycloaddition with hexafluoroacetone to give the metalla heterocycle (eta-5-C5Me5)(CO)-Fe-P(=PMes*)OC(CF3)2C(O) with a remarkably short Fe-P bond (2.084 (4) angstrom) and an exocyclic P=P bond. When stored in solution at -40-degrees-C, this complex partly rearranges to the metalated 1-oxa-2,3-diphosphetane (eta-5-C5Me5)(CO)2Fe-P-P(Mes*)OC(CF3)2. The molecular structures of both isomers were elucidated by single-crystal X-ray analyses.
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Weber L, Buchwald S, Lentz D, Preugschat D, Stammler H-G, Neumann B. Cycloaddition Reactions of the Diphosphenyl Complex (η5-C5Me5)(CO)2Fe-P=P-Mes* (Mes* = 2,4,6-tBu3C6H2) with Hexafluoroacetone. X-Ray Structure Analyses of (η5-C5Me5)(CO) Fe P(=PMes*)OC(CF3)2CO and (η5-C5Me5)(CO)2FePP(Mes*)OC(CF3)2. Organometallics. 1992;11(7):2351-2353.
Weber, L., Buchwald, S., Lentz, D., Preugschat, D., Stammler, H. - G., & Neumann, B. (1992). Cycloaddition Reactions of the Diphosphenyl Complex (η5-C5Me5)(CO)2Fe-P=P-Mes* (Mes* = 2,4,6-tBu3C6H2) with Hexafluoroacetone. X-Ray Structure Analyses of (η5-C5Me5)(CO) Fe P(=PMes*)OC(CF3)2CO and (η5-C5Me5)(CO)2FePP(Mes*)OC(CF3)2. Organometallics, 11(7), 2351-2353.
Weber, L., Buchwald, S., Lentz, D., Preugschat, D., Stammler, H. - G., and Neumann, B. (1992). Cycloaddition Reactions of the Diphosphenyl Complex (η5-C5Me5)(CO)2Fe-P=P-Mes* (Mes* = 2,4,6-tBu3C6H2) with Hexafluoroacetone. X-Ray Structure Analyses of (η5-C5Me5)(CO) Fe P(=PMes*)OC(CF3)2CO and (η5-C5Me5)(CO)2FePP(Mes*)OC(CF3)2. Organometallics 11, 2351-2353.
Weber, L., et al., 1992. Cycloaddition Reactions of the Diphosphenyl Complex (η5-C5Me5)(CO)2Fe-P=P-Mes* (Mes* = 2,4,6-tBu3C6H2) with Hexafluoroacetone. X-Ray Structure Analyses of (η5-C5Me5)(CO) Fe P(=PMes*)OC(CF3)2CO and (η5-C5Me5)(CO)2FePP(Mes*)OC(CF3)2. Organometallics, 11(7), p 2351-2353.
L. Weber, et al., “Cycloaddition Reactions of the Diphosphenyl Complex (η5-C5Me5)(CO)2Fe-P=P-Mes* (Mes* = 2,4,6-tBu3C6H2) with Hexafluoroacetone. X-Ray Structure Analyses of (η5-C5Me5)(CO) Fe P(=PMes*)OC(CF3)2CO and (η5-C5Me5)(CO)2FePP(Mes*)OC(CF3)2”, Organometallics, vol. 11, 1992, pp. 2351-2353.
Weber, L., Buchwald, S., Lentz, D., Preugschat, D., Stammler, H.-G., Neumann, B.: Cycloaddition Reactions of the Diphosphenyl Complex (η5-C5Me5)(CO)2Fe-P=P-Mes* (Mes* = 2,4,6-tBu3C6H2) with Hexafluoroacetone. X-Ray Structure Analyses of (η5-C5Me5)(CO) Fe P(=PMes*)OC(CF3)2CO and (η5-C5Me5)(CO)2FePP(Mes*)OC(CF3)2. Organometallics. 11, 2351-2353 (1992).
Weber, Lothar, Buchwald, Susanne, Lentz, Dieter, Preugschat, Dagmar, Stammler, Hans-Georg, and Neumann, Beate. “Cycloaddition Reactions of the Diphosphenyl Complex (η5-C5Me5)(CO)2Fe-P=P-Mes* (Mes* = 2,4,6-tBu3C6H2) with Hexafluoroacetone. X-Ray Structure Analyses of (η5-C5Me5)(CO) Fe P(=PMes*)OC(CF3)2CO and (η5-C5Me5)(CO)2FePP(Mes*)OC(CF3)2”. Organometallics 11.7 (1992): 2351-2353.
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