ChemicalBook CAS DataBase List Tetraphenylcyclopentadienone

Tetraphenylcyclopentadienone synthesis

9synthesis methods

Product Name:Tetraphenylcyclopentadienone
CAS Number:479-33-4
Molecular formula:C29H20O
Molecular Weight:384.47

Tetraphenylcyclopentadienone can be synthesized by a double aldol condensation involving benzil and dibenzyl ketone in the presence of a basic catalyst.
Synthesis of tetraphenylcyclopentadienone

Synthesis of tetraphenylcyclopentadienone

Tetraphenylcyclopentadienone has been prepared by the action of phenylmagnesium bromide on benzaldiphenylmaleide, and by reduction, dehydration, and oxidation of the methylenedesoxybenzoin obtained by condensing formaldehyde with desoxybenzoin. The present procedure is essentially that of Dilthey.
Synthesis of tetraphenylcyclopentadienone

134-81-6 Synthesis

134-81-6
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102-04-5 Synthesis

102-04-5
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479-33-4
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$11.00/1g

Yield:479-33-4 90%

Reaction Conditions:

with potassium hydroxide in ethanol for 2 h;Reflux;

Steps:

2.1 2.2.1 Synthesis of tetraphenylcyclopentadienone (1)
Benzil (6.3g, 0.03mol) and 1,3-dibenzyl ketone (6.3g, 0.03mol) were dissolved in 60mL of ethanol and then heated with stirring. When the mixture started to reflux, KOH (0.8g dissolved in 8mL of ethanol) was dropped into the mixture and allowed to react for 2h until black precipitate formed. After the solution was cooled to room temperature, the precipitate was filtered and washed with ethanol for three times to obtain a black solid 17 product with yield of 90% . Melt point: 219°C. ¹H NMR (CDCl₃, 400MHz, ppm): δ 8.08 (d, 2H), 7.86 (m, 6H), 7.61 (dd, 2H), 7.54 (dd, 4H), 7.42 (t, 2H). ¹³C NMR (CDCl₃, 100MHz, ppm): δ 154.2, 132.1, 131.5, 131.4, 129.0, 128.6, 128.3, 127.8, 121.7, 120.9. ESI-MS spectrometry: m/z calculated for C₂₉H₂₀O [M+H]⁺: 384.15; found: 384.16. Anal. Calcd for C₂₉H₂₀O: C 90.60%, H 4.16%; found: C 90.66%, H 4.17%.

References:

Liang, Yan [Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy,2019,vol. 216,p. 395 - 403]

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