Abstract: The first examples of 1, 3-dipolar cycloadditions of a&unsaturated carbene complexes are described. The reaction of alkynylcarbene complexes with diazomethane gives a mixture of two products. The first arises from a [3+ 21 cycloaddition on the carbon- carbon triple bond of the alkynyl complex to give a pyrazole carbene complex and the second is most likely a secondary product which arises from attack of diazomethane on ...
![3-methyl-6-propylpyrazolo[1,5-a]pyridine-4,7-dione Structure](https://image.chemsrc.com/caspic/403/103240-15-9.png)
