2,4,6-Tris(4-methoxyphenyl)pyrylium tetrafluoroborate

2,4,6-Tri-p-anisylpyrylium (TAP) fluoroborate
Empirical Formula (Hill Notation):
CAS Number:
Molecular Weight:



Quality Level

reaction suitability

reagent type: catalyst
reaction type: Photocatalysis


346-351 °C

SMILES string



2,4,6-Tris(4-methoxyphenyl)pyrylium tetrafluoroborate can be used to catalyze the stereoselective synthesis of C2-symmetric cyclobutane alkene dimers via photo-induced electron transfer. This method can be employed for the total synthesis of lignans such as magnosalin, endiandrin A and pellucidin A. It can also catalyze photoinduced electron transfer (PET) to initiate radical-cation Diels-Alder reactions.
Triarylpyrylium salt used as a photosensitizer in photocatalysis and polymerization. This was previously sold under catalog number S921874.


10, 250 mg in glass insert


13 - Non Combustible Solids

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

Certificate of Origin

Synthesis of cyclobutane lignans via an organic single electron oxidant?electron relay system.
Riener M and Nicewicz D A
Chemical Science, 4(6), 2625-2629 (2013)
Electron?Transfer?Induced Diels?Alder Reactions of Indole and Exocyclic Dienes: Synthesis and Quantum?Chemical Studies.
Haberl U, et al.
Chemistry?A European Journal , 5(10), 2859-2865 (1999)
Christo S Sevov et al.
The Journal of organic chemistry, 73(20), 7909-7915 (2008-09-13)
Electron transfer catalysis is an effective method for the acceleration of Diels-Alder reactions between two substrates of similar electron density. The dependence of the selectivity of the Diels-Alder reaction between (R)-alpha-phellandrene and 4-methoxystyrene catalyzed by photoinduced electron transfer with tris(4-methoxyphenyl)...
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The Nicewicz lab is focused on the discovery of new and powerful reaction methodologies that proceed via the intermediacy of highly reactive cation radical species. Included in these transformations are anti-Markovnikov selective additions of amines, alcohols, carboxylic acids, amides and mineral acids to alkenes.
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