126664-40-2

Upstream product

• 124945-37-5 2,6-Bis(brommethyl)-3,5-diphenyl-4-pyranon 
• 126664-38-8 11,13-Diphenyl-2,6-dithia<7>(2,6)pyranophan-10-on 
• 126664-39-9 10-Oxo-11,13-diphenyl-2,6-dithia<7>(2,6)-pyranophan-2,2,6,6-tetroxid 

Relevant academic research and scientific papers

Darstellung und Konformationsanalyse von 9,11-Diphenyl(2,6)-pyranophan-10-on

Phanone 5 has been generated by pyrolysis of bis(sulfone) 4.This reaction is the first example of a combined allylic-aliphatic pyrolysis of bis(sulfones); it follows a two-step mechanism, as is concluded from the absence of cross products and the formation of mono(sulfone) 5a as a by-product.The flipping of the pentamethylene chain of 5 is unhindered at room temperature as shown by (1)H NMR.At 213 K this flipping process is slowed on the NMR time scale, and rotation about the C-2-C-3 axis is no longer possible.The crystal structure of 5 shows the expected tub-like conformation of the heterocycle.