136409-29-5

Upstream product

• 26740-23-8 N-(1,2-Diphenylvinyl)iminotriphenylphosphoran 
• 525-06-4 diphenyl ketene 

Downstream Products

• 136409-34-2 N-(1,2-Diphenylvinyl)-2,2-diphenylacetamid 
• 136434-40-7 2-(Diphenylmethylen)-6,6-bis(4-methoxyphenyl)-4,5-diphenyl-3,6-dihydro-2H-1,3-thiazin 

Relevant academic research and scientific papers

N-Vinylketenimines

The title compounds 5 are generated in situ from N-vinyliminotriphenylphosphoranes 1 and ketenes 2 in a Wittig-type reaction.The phosphoranes are useful intermediates for the preparation of numerous heterocycles as illustrated by the formation of 1,3-oxazines 8, pyridinones 9, pyrimidinones 10 and 1,3-thiazines 11.Water adds readily to 5 to yield vinylacetamides 7, whereas thermal rearrangement gives rise to the isoquinoline 4 or the spiro system 6, respectively.Under very mild conditions, crystalline precursors (type 3) of the N-vinylketenimines, which still contain the triphenylphosphonio group, have been isolated.These react like the N-vinylketenimines generated in situ, giving however less byproducts. Key Words: Phosphorus ylides / Ketenes / Ketenimines