Received M ay 1.8, 2972 anhydro-3-Hydroxy-2, 4, 6-triphenylpyrylium hydroxide underwent 1, 3-dipolar cycloaddition reactions with a variety of acetylenic and olefinic dipolarophiles, as well as heterocumulenes, forming 1: 1 adducts by reaction at the 2, 6 positions. Thermolysis of these adducts either resulted in rearrangement to substituted cyclohexadienones or in dissociation to the initial reactants. The adduct from ...
![4-oxo-1,3,5-triphenyl-8-oxa-bicyclo[3.2.1]octa-2,6-diene-6,7-dicarboxylic acid dimethyl ester Structure](https://image.chemsrc.com/caspic/154/35740-92-2.png)
