SEARCH Articles Figures Tables 1.5- Dimethylpyrazole 1,3 -Dimethylpyrazoles 17-Ethynyl-13-methyl 3 : 5-Dimethylpyrazole 4-Ethynyl-1.3-dimethylpyrazole 4-Ethynyl-1.3-dimethylpyrazole methylation 4-Ethynyl-l,3-dimethylpyrazole Ethynylation Ethynyls