Reactions of 1-Allenylpyrazole and 1-Allenyl-1,2,4-triazole with Hydrogen Chloride and Metal Chlorides

摘要

1-Allenylpyrazole and 1-allenyl-1,2,4-triazole react with hydrogen chloride via proton addition at the pyridine-like nitrogen atom (N~2 and N~4,respectively).In the reaction with 1-allenylpyrazole,1-[(E)-3-chloro-1-propenyl]pyrazole is also formed via regio- and stereoselective addition of hydrogen chloride to the propadienyl group.1-Allenylpyrazole and 1-allenyl-1,2,4-triazole act as unidentate ligands with respect to Co,Ni,Cu,Zn,Cd,Pd,and Sn,the donor centers being N~2 and N~4,respectively.Apart from mononuclear coordination compounds,1-allenylpyrazole gives rise to polymeric complexes which contain units and blocks formed by the free ligand.