Reaction of MCl4 (M=Zr, Hf) with 2 equiv of 2-iminophosphorano-1-phosphaallyl lithium [Li{P(Ph)C(=CHPh)P(Me)2=NSiMe3}-(THF)1.5] (1) affords ligand coupling complexes 3 and 4, respectively, while similar treatment of ZrCl4 with [Li{P(Ph)C(=C(SiMe2But)Ph)P(Me)2=NSiMe3}(THF)2] (2) yields ligand transfer complex 5.

Solventless condensation of a diketone and a hydrazine in the presence of a catalytic amount of sulfuric acid at room temperature afforded pyrazole derivatives 3a-3i and 4g-4i in high yields. The condensation of 2,4-pentanedione and hydrazides gave similar results, while the reaction between 1-phenylbutane-1,3-dione and hydrazides under the same conditions afforded 4,5-dihydro-5-hydroxypyrazole derivatives 6a and 6b, which can be transformed to 4i (for 6b) or a mixture of 1-acylpyrazole and 3i (4i) (for 6a) by thermolysis in the presence of a catalytic amount of sulfuric acid. Similar reaction of ethyl acetoacetate with phenylhydrazine or hydrazine formed 2-pyrazolin-5-one 8 and 3-pyrazolin-5-one 9, respectively. Reactions of 2,4-dinitrophenylhydrazine with 2,4-pentanedione and ethyl acetoacetate yielded hydrazones 10 and 11, respectively.

Reaction of an arylacetylene with an azide in hot water gave 1,4-disubstituted 1,2,3-triazoles in high yields, while similar reaction between a terminal aliphatic alkyne and an azide (except m-nitroazidobenzene) afforded a mixture of regioisomers with the ratio of 1,4-to 1,5-isomers ranging from 3: 1 to 28.6: 1. Reactions of m-nitroazidobenzene with either arylalkynes or aliphatic alkynes formed only 1,4-disubstituted derivatives in excellent yields.