128641-84-9

Upstream product

• 128641-83-8 3,3a,6,6a-tetrahydro-3,3,6,6-tetramethyl-3a-(p-tolylsulfonyl)pyrazolo<4,3-c>pyrazole 
• 128641-81-6 3,3-dimethyl-4-(p-tolylsulfonyl)-3H-pyrazole 
• 107696-97-9 3,3-dimethyl-4-(p-tolylsulfonyl)-5-(trimethylsilyl)-3H-pyrazole 
• 128641-87-2 1-acetyl-4-chloro-5,5-dimethyl-4-(p-tolylsulfonyl)-2-pyrrazoline 

Relevant academic research and scientific papers

Dipolar cycloaddition reaction of diazoalkanes with trimethylsilyl substituted alkynes. Steric control of regiochemistry by the trimethylsilyl group

A study of the cycloaddition behavior of several trimethylsilyl substituted alkynes with 2-diazopropane and diazomethane has been carried out. Aryl or alkyl ethynyl sulfones react to give 5-sulfonyl substituted 3H-pyrazoles which extrude nitrogen on photo