Stable N‑Phosphorylated
1,2,4-Triazol-5-ylidenes:
Novel Ligands for Metal Complexes
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Abstract
Synthetic routes to novel N-phosphorylated 1,2,4-triazolium
salts
have been developed. Treatment of the specified salts with strong
base produces new stable N-phosphorylated 1,2,4-triazol-5-ylidenes,
which add Se in two stages (first at the carbene carbon and then at
phosphorus) and rearrange to C-phosphorylated triazoles with heating.
The capacity of such N-phosphorylated triazol-5-ylidenes to act as
bidentate ligands toward transition-metal centers has also been demonstrated;
in particular, the formation of two dinuclear silver carbene complexes
is described herein. The structures of one representative carbene
and of one carbene complex were determined by an X-ray study