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An analysis of the addition reaction of (i-Pr2NP)2Fe2(CO)6 unit to C double bond O, C triple bond N, and C double bond C multiple bonds reveals that the multiple bond reactivity pattern to the carbonyl unit is in the order C double bond O is greater than C double bond C is greater than C triple bond N. The unit's preference for the C double bond O bond over the C double bond C multiple bond during reaction in maleic anhydride validates the reactivity sequence. The complexed ((i-Pr2NP)2NHC double bond CHCO2-Et)-Fe2(CO)6 imine derivative modifies organic system tautomeric equilibria by complexation with an (i-Pr2NP)2-Fe2(CO)6 unit.

Fe(CO)5 in boiling toluene and Fe3(CO)12 in boiling benzene promoted the ring cleavage of tri-tert-butylcyclotriphosphine forming t-Bu3P3Fe2(CO)6. The product featured sterically hindered tert-butyl groups which reduced the chemical reactivity of the compound. The introduction of a chlorine atom at the center of the cyclotriphosphine intermediate replacing the diisopropylamino unit increased the accessibility of the compound to metal carbonyl intrusion.

Describes the relative reactivity sequence of carbon multiple bonds toward phosphorus-bridging carbonyl derivative is C==O > C==C > C==N. Reaction of norbornadiene; Structural features of CXP2Fe2 cages; Reactions of organic carbonyl derivatives; Reactions of nitriles with phosphorus-bridging carbonyl derivatives.