The Coordination Chemistry of the Ylide Adduct O2CC(PPh3)2; Preparation, Crystal Structures, and Spectroscopic Properties of [Cl3In{O2CC(PPh3)2}], [Cl2Sn{O2CC(PPh3)2}], and [I2In{O2CC(PPh3)2}2]I

The betain like carbodiphosphorane CO2 adduct O2CC(PPh3)2 (1a) can serve as a ligand versus hard Lewis acids from main group compounds. Thus, reaction of 1a with InCl3, InI3 and SnCl2 in polar solvents leads to the addition compounds [Cl3In{O2CC(PPh3)2}] (2), [Cl2SnO2CC(PPh3)2}] (3) and the salt like compound [I2In{O2CC(PPh3)2}2]I (4) in good yields. Whereas in the indium compounds 1a acts as a chelating ligand, in the tin compound the molecule coordinates with one oxygen atom only as a monodentate ligand. 4 has a pyramidal structure with a stereochemical active pair of electrons. All compounds could be characterized by X-ray analyses and the usual spectroscopic methods.

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