Arsane ligands

The first transition metal adducts containing the tetraphos-phorus molecule were reported by Ginsberg in 1971 (32). They resulted indeed from direct substitution of white phosphorus for phosphane or arsane ligands on low-valent rhodium ... 

Similar to the chemistry described in the preceding section, some (arsanylalkyl)cyclopentadienyl complexes were reported. Arsane ligands for transition metals in contrast to phosphanes have the advantage that they are not sensitive to oxidation by oxygen. ... 

The theoretical section introduced divalent carbon(O) compounds as molecules CL2 where the ligand L is a ct donor. In principle this task can be fulfilled by various neutral group 15 compounds (N2, nitriles, amines, phosphanes, arsanes, etc.), neutral group 16 compounds (sulfides, selenides, etc.) as well as by divalent C(II) with a free pair of electrons at a carbon atom, such as isonitriles, NHCs, carbenes, CO, ylides, etc. The neutral and isolable compound C2PPh3 [14,15] may also serve as a donor L to stabilize a carbon atom. 

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