50405-98-6

Upstream product

• 87121-10-6 6-Benzhydrylidene-4-methyl-5,6-dihydro-pyran-2-one 
• 87121-05-9 bis(trimethylsilyl) vinyl ketene acetal 
• 25436-25-3 trimethylsilyl 3,3-dimethylacrylate 
• 541-47-9 3-Methylbutenoic acid 

Downstream Products

• 50405-83-9 1-hydroxy-4-methyl-6-benzhydryl-2-pyridone 

Relevant academic research and scientific papers

Halogenated Ketenes. 37. The Synthesis of Pyranones Utilizing the (4 + 2) Cycloaddition of Ketenes and Siloxy Dienes

The reaction of diphenyl-, dichloro-, and chloroketenes with several siloxy dienes results in (4 + 2) and/or (2 + 2) cycloaddition products depending primarily on substitution in the diene.The (4 + 2) cycloaddition products are easily hydrolyzed to pyranones.These results are discussed in terms of a dipolar intermediate.