Abstract
AbstractThe salt metathesis reaction of KPPh2 with CaI2 and SrI2 in THF yields the corresponding complexes [(THF)4Ae(PPh2)2] [Ae = Ca (1), Sr]. Depending on the crystallization conditions, cis‐ or trans‐[(THF)4Ca(PPh2)2] can be isolated. In solution, a fast equilibrium converts these isomers into each other leading to a single set of resonances in the NMR spectra. The THF ligands can be replaced by stronger Lewis bases, such as N‐methylimidazole (MeIm), which leads to the formation of [(MeIm)4Ae(PPh2)2] [Ae = Ca (2a), Sr (2b)]. The use of tetradentate hexamethyltriethylenetetramine (hmteta) fixes a cis configuration yielding [(hmteta)Ca(PPh2)2] (3). All compounds are very air and moisture sensitive, therefore a few crystals of the partially oxidized product [(hmteta)Ca(PPh2)(OPPh2)] (4) were also obtained.
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