21172-76-9

Upstream product

• 122-51-0 orthoformic acid triethyl ester 
• 100-06-1 1-(4-methoxyphenyl)ethanone 

Downstream Products

• 129806-49-1 4-(Diphenyl-phosphinoyl)-2,6-bis-(4-methoxy-phenyl)-4H-pyran 
• 80392-99-0 2,6-di(4-methoxyphenyl)-4H-pyran 
• 173257-81-3 2,6-bis(4-methoxyphenyl)-4-phenylethynyl-4H-pyran 
• 173257-84-6 1,5-bis(4-methoxyphenyl)-3-phenylethynyl-1,5-pentanedione 
• 91220-73-4 4-<(Diphenylphosphoryl)methylen>-2,6-bis(4-methoxyphenyl)-4H-pyran 
• 59155-89-4 2,2',6,6'-tetra(4-methoxyphenyl)-Δ^4,4'-bi-4H-pyran 

Relevant academic research and scientific papers

The Relative Electron Donating Ability of Substituents, Determined in 2,6-Disubstituted Pyrylium Cations

Tha carbon-13 NMR spectra of a series of 2,6-disubstituted pyrylium compounds have been investigated.The chemical shift of C(4) is a measure of the charge density in that position of the ring.The variation of the chemical shift with the change of substitu

One-Pot Synthesis of 2,6-Di-t-butyl- and 2,6-Diarylthiopyrylium Perchlorates

The title compounds were prepared by reaction of the corresponding methyl ketone with an excess of triethyl orthoformate in an acidic medium (acetic anhydride/perchloric acid) under a hydrogen sulfide stream.

Some Reactions of 4H-Pyrylium Salts with Tributylphosphine and with Tertiary Amines

The phosphonium salt from tributylphosphine and 2,6-di(4-methoxyphenyl)pyrylium perchlorate (3) reacted with diisopropylethylamine in acetonitrile to give 2,2',6,6'-tetra(4-methoxyphenyl)-Δ4,4'-bi-4H-pyran in quantitative yield.The reaction of 3 and other 4H-pyrylium salts with tertiary amines gave 4H-pyrans.