P−C and C−H Bond Cleavages in the Photochemical Reactions of [Fe2(η5-C5H5)2(CO)4] with Bis(diphenylphosphino)methane

Variable Reactivity of a N-Heterocyclic Phosphenium Complex: P-C Bond Activation or "Abnormal" Deprotonation

The reaction of an N-heterocyclic phosphenium complex of manganese with MeLi/Et₃ NHCl under formal addition of CH₄ to the Mn=P double bond can be reversed upon UV photolysis, providing a rare example for selective P-C(alkyl) bond activation. Action of LDA on the phosphenium complex does not proceed via attack at phosphorus but rather via C4-deprotonation to yield a unique P-analogue of an "abnormal" carbene. A transmetalation product of the original complex was fully characterized. The C-metalation is also applicable to bis-phosphenium complexes of other metals.

Two-step C–H, C–P bond activation at an α-diimine iron dinitrogen complex

Thermolysis of newly prepared (Ph2PPrDI)Fe(N2) results in chelate C–H and C–P bond activation to yield phosphide-bridged dimers.

The coordination chemistry of the proton

It is well known that an acidic hydrogen atom can form hydrogen bonds to a hydrogen bond acceptor, a Lewis base. It is considerably less known that the proton can coordinate two or more atoms conveniently in bonding modes that cannot be described as hydrogen bonding. Agostic interactions, bridging hydrides, 3-centre-2-electron bonds in boranes, bifurcated hydrogen atoms, they are all elements of the coordination chemistry of the proton and, of course, the hydrogen bond comes in more than one facette as well.

Novel metalloreagent Cp(CO)2FeP(Se)(OR)2 produced from P-Se bond cleavage in the thermal reaction of [CpFe(CO)2]2 with phosphor-1,1-diselenolates

The reaction of [CpFe(CO)2]2 with NH4Se2P(OR)2 yields a novel reagent Cp(CO)2FeP(Se)(OR)2, which has demonstrated coordination properties at the Se center to form heterometallic clusters as well as reactivity at the Se site toward C-based electrophiles.