1791-19-1

Upstream product

• 1595-53-5 4-methylpent-3-en-1-yne 
• 100-52-7 benzaldehyde 
• 590-37-4 2-methylpent-4-yn-2-ol 
• 64305-70-0 1,1-dibromo-4-methyl-1,3-pentadiene 

Downstream Products

• 56155-47-6 3-Phenylamino-1-phenyl-5-methyl-2,4-hexadien-1-on 
• 1585-01-9 5-Methyl-1-phenylhex-4-en-2-in-1-on 

Relevant academic research and scientific papers

Development of a [2 + 2]-Nitroso/Alkene Cycloaddition Using Sodium Tetrakis[3,5-bis(trifluoromethyl)phenyl]borate Catalyst: Controlled Chemoselectivity of Two Equilibrating Isomeric Intermediates

Sodium tetrakis[3,5-bis(trifluoromethyl)-phenyl]borate (NaBArF) catalyzes the [2 + 2] cycloaddition of 1,4-disubstituted cyclopenta-1,3-dien-2-yl esters with nitrsobenzene in toluene, affording two isolable regioisomers of 6-oxa-7-azabicyclo[3.2.0] heptanes, which thermally rearrange into the same 4-aminocyclopent-1-en-3-ones. In the case of 4-substituted cyclopenta-1,3-dien-2-yl esters, their initial [2 + 2] cycloaddition intermediates undergo a rapid ring expansion to afford six-membered piperidone derivatives efficiently.