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1,3-Diphenylisobenzofuran

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1,3-Diphenylisobenzofuran
Names
Preferred IUPAC name
1,3-Diphenyl-2-benzofuran
Identifiers
ChemSpider
ECHA InfoCard 100.024.371 Edit this at Wikidata
UNII
Properties
C20H14O
Molar mass 270.33 g·mol−1
Appearance pale yellow[1] to dark yellow crystalline powder[2]
Density 1.0717 g·cm−3 bei 25 °C[3]
Melting point * 125–126 °C[4]
  • 128–130 °C[2]
almost insoluble
Solubility in acetonitrile, benzene, dichloromethane, chloroform, dimethylsulfoxide, tetrahydrofuran or toluene soluble[5]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

1,3-Diphenylisobenzofuran is a highly reactive diene that can scavenge unstable and short-lived dienophiles in a Diels-Alder reaction. It is furthermore used as a standard reagent[6] for the determination of singlet oxygen,[7] even in biological systems.[8] Cycloadditions with 1,3-diphenylisobenzofuran and subsequent oxygen cleavage provide access to a variety of polyaromatics.

Preparation

[edit]

The first synthesis of 1,3-diphenylisobenzofuran was reported in 1905 by A. Guyot and J. Catel.[9][10] Phenylmagnesium bromide was reacted with 3-phenylphthalide (the latter accessible from the methyl ester of 3-hydroxyphthalide with phenylboronic acid in 95% yield[11]) to a lactol, which gives with mineral acids upon elimination of water 1,3-diphenylisobenzofuran with 87% yield.[12]

Synthese von 1,3-Diphenylisobenzofuran aus 3-Phenylphthalid
Synthese von 1,3-Diphenylisobenzofuran aus 3-Phenylphthalid

The patent literature describes the preparation of 1,3-diphenylisobenzofuran by [4+2]cycloaddition of 1,3-butadiene and dibenzoylethylene (1,4-diphenyl-2-butene-1,4-dione, accessible from fumaryl chloride and benzene in the presence of aluminium chloride.[13]).[14] Dibenzoylethylene is predominantly present in the trans configuration[15] but it can be converted into the needed cis configuration by simple heating.[16]

Synthese von 1,3-Diphenylisobenzofuran aus Butadien und Dibenzoylethylen
Synthese von 1,3-Diphenylisobenzofuran aus Butadien und Dibenzoylethylen

The 4,5-dibenzoylcyclohexene formed previously is cyclized with acetic anhydride to the dihydroisobenzofuran. By bromine addition and hydrogen bromide elimination, 1,2-dibenzoylbenzene is formed and recyclized with zinc acetic acid to the final product 1,3-diphenylisobenzofuran.[17] A publication from 1940 describes high yields for the individual stages of the extensive reaction sequence.[4]

The (much cheaper) phthaloyl chloride gives also access to 1,2-dibenzoylbenzene via Friedel-Crafts acylation with benzene,[18] which is reduced to 1,3-diphenylisobenzofuran in 78% yield using potassium borohydride.[19]

Synthese von 1,3-Diphenylisobenzofuran aus 1,2-Dibenzoylbenzol
Synthese von 1,3-Diphenylisobenzofuran aus 1,2-Dibenzoylbenzol

The synthesis of 1,3-diarylisobenzofurans from 2-acylbenzaldehydes and boronic acids is less cumbersome and gives better yields,[20]

Synthese von 1,3-Diphenylisobenzofuran aus 2-Formylbenzophenon
Synthese von 1,3-Diphenylisobenzofuran aus 2-Formylbenzophenon

just like the synthesis from salicylaldehydes via phenacylhydrazones, which undergo oxidation with lead(IV) acetate to give ortho-diketones,[21] followed by the reaction with an aryl Grignard reagent.[22]

Synthese von 1,3-Diphenylisobenzofuran aus Salicylaldehyd
Synthese von 1,3-Diphenylisobenzofuran aus Salicylaldehyd

Properties

[edit]

1,3-Diphenylisobenzofuran is a yellow, light- and air-sensitive, crystalline solid that is soluble in many organic solvents with a maximum absorption around 420 nm (in solution), which generates intense fluorescence.[23] Fluorescence measurements can be performed in DMF and DMSO because of the stability of 1,3-DPBF in those solvents. In chloroform and carbon tetrachloride the dissolved 1,3-diphenylisobenzofuran is rapidly photolyzed by attack of CHCl2 and CCl3 radicals, even in the absence of oxygen.[24] [24 ]

With ethanol, 1,3-diphenylisobenzofuran forms an orange-yellow, fluorescent solution. On irradiation, it forms a colorless photodimer (upon with exclusion of oxygen), upon discolouration of the solution.[25]

Photodimerisierung von 1,3-Diphenylisobenzofuran
Photodimerisierung von 1,3-Diphenylisobenzofuran

The compound's refractive index is 1,6700 at 25 °C and 589 nm.[3]

Use

[edit]

Reagent for determination of singlet oxygen

[edit]
1,3-Diphenylisobenzofuran Reaktion mit Singulett-Sauerstoff
1,3-Diphenylisobenzofuran Reaktion mit Singulett-Sauerstoff
Graph showing change in absorbance of DPBF vs. irradiation time in the presence of photosensitizer (porphyrin)[26]
Electron absorption spectrum showing photodegradation of DPBF in the presence of a porphyrin photosensitzier, during intermittent periods of irradiation with ~630 nm light

In the presence of methylene blue irradiated with red laser light, 1,3-diphenylisobenzofuran reacts with intermediate singlet oxygen 1O2, forming an unstable peroxide that decomposes into (colorless) 1,2-dibenzoylbenzene.[27] The detection of singlet oxygen by 1,3-diphenylisobenzofuran is based on this reaction, even in biological systems. For biological systems, water-soluble derivatives of 1,3-diphenylisobenzofuran were developed.[28] The singlet oxygen generation of photosensitizers were monitored by photolysis of 1,3-diphenylisobenzofuran (DPBF). 1,2-Dibenzoylbenzene absorbs at <300 nm, therefore making DPBF an optimal chemical trap for detecting singlet oxygen, as most photosensitizers absorb <400-600 nm. This allows for an accurate determination of the photodegradation of the molecule.

Dienophile in Diels-Alder reactions

[edit]

Isobenzofurans like 1,3-diphenylisobenzofuran are among the most reactive Diels-Alder dienes known to date,[29] and are useful for scavenging short-lived and unstable olefins and alkynes. The group led by Georg Wittig made important contributions to this topic.

With the unstable cyclohexyne, 1,3-diphenylisobenzofuran reacts to a tricyclic compound that gives a 9,10-diphenylcyclohexenonaphthalene after hydrogenation and hydrogen abstraction.[30]

Reaktion von 1,3-Diphenylisobenzofuran mit Cyclohexin
Reaktion von 1,3-Diphenylisobenzofuran mit Cyclohexin

1,3-Diphenylisobenzofuran gives similarly with benzyne (dehydrobenzene) an oxygen-bridged anthracene (in 85% yield), which can be reduced with zinc to 9,10-diphenylanthracene (88% yield).[31]

Reaktion von 1,3-Diphenylisobenzofuran mit Dehydrobenzol
Reaktion von 1,3-Diphenylisobenzofuran mit Dehydrobenzol

Cyclopropenone (which is unstable above its melting point of -29 °C) reacts quantitatively at room temperature with 1,3-diphenylisobenzofuran to form a Diels-Alder adduct,[32] which is exclusively an exo isomer.[33]

Reaktion von 1,3-Diphenylisobenzofuran mit Cyclopropenon
Reaktion von 1,3-Diphenylisobenzofuran mit Cyclopropenon

Dimethyl acetylenedicarboxylate reacts with 1,3-diphenylisobenzofuran as dienophile in 84% yield to yield the corresponding adduct.[34]

Reaktion von 1,3-Diphenylisobenzofuran mit Acetylendicarbonsäureester
Reaktion von 1,3-Diphenylisobenzofuran mit Acetylendicarbonsäureester

1,3-Diphenylisobenzofuran reacts also with heterocyclic dienophiles such as 3-sulfolene to the corresponding Diels-Alder adduct.[35]

Molecular building block for polyaromatics

[edit]

Polyaromatic hydrocarbons (PAHs) are of interest as precursors to graphite but also raise concern as ingredients of pollution. They have persistence and carcinogenicity. 1,3-diphenylisobenzofuran reacts quantitatively with acenaphthylene when heated to 160 °C to give 7,12-diphenylbenzo[k]fluoranthene.[36]

Reaktion von 1,3-Diphenylisobenzofuran mit Acenaphthylen
Reaktion von 1,3-Diphenylisobenzofuran mit Acenaphthylen

The twice occurring Diels-Alder reaction of 1,3-diphenylisobenzofuran with p-benzoquinone yields almost quantitatively a product that can be reacted further with p-toluenesulfonic acid to give a pentacene derivative in 49% yield.[37]

Reaktion von 1,3-Diphenylisobenzofuran zum Pentacen
Reaktion von 1,3-Diphenylisobenzofuran zum Pentacen

Literature

[edit]
  • W. Friedrichsen (1980), "Benzo[c]furans", Adv. Heterocycl. Chem., Advances in Heterocyclic Chemistry, vol. 26, pp. 135–234, doi:10.1016/S0065-2725(08)60141-5, ISBN 9780120206261
  • W. Friedrichsen (1999), "Recent Advances in the Chemistry of Benzo[c]furans and Related Compounds", Adv. Heterocycl. Chem., Advances in Heterocyclic Chemistry, vol. 73, pp. 1–96, doi:10.1016/S0065-2725(08)60940-X, ISBN 9780120207732
  • R. Rodrigo (1988), "Progress in the chemistry of isobenzofurans: Applications to the synthesis of natural products and polyaromatic hydrocarbons", Tetrahedron, vol. 44, no. 8, pp. 2093–2135, doi:10.1016/S0040-4020(01)81720-8

References

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  3. ^ a b Carl L. Yaws (2015), Thermophysical Properties of Chemicals and Hydrocarbons, 2nd Edition, Oxford, UK: Elsevier Inc., p. 604, ISBN 978-0-323-28659-6
  4. ^ a b R. Adams; M.H. Gold (1940), "The Synthesis of 1,3-Diphenyldihydroisobenzofurans, 1,3-Diphenylisobenzofurans and o-Dibenzoylbenzenes from the Diene Addition Products to Dibenzoylethylene", Journal of the American Chemical Society, vol. 62, no. 1, pp. 56–61, Bibcode:1940JAChS..62...56A, doi:10.1021/ja01858a012
  5. ^ P.C. Kierkus (2001), "1,3-Diphenylisobenzofuran", E-EROS Encyclopedia of Reagents for Organic Synthesis, doi:10.1002/047084289X.rd420, ISBN 0471936235
  6. ^ R.H. Young; K. Wehrly; R.L. Martin (1971), "Solvent effects in dye-sensitized photooxidation reactions", Journal of the American Chemical Society, vol. 93, no. 22, pp. 5774–5779, Bibcode:1971JAChS..93.5774Y, doi:10.1021/ja00751a031
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  8. ^ P. Carloni; et al. (1993), "On the use of 1,3-diphenylisobenzofuran (DPBF). Reactions with carbon and oxygen centered radicals in model and natural systems", Res. Chem. Intermed., vol. 19, no. 5, pp. 395–405, doi:10.1163/156856793X00181, S2CID 94802096
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  18. ^ Houben-Weyl Methods of Organic Chemistry (1973), Organometallic Compounds of Group II of the Periodic Table, 4th Edition, vol. XIII/2a, Stuttgart: Thieme, p. 419, ISBN 978-3-13-213204-7
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  25. ^ A. Schönberg; A. Mustafa; G. Aziz (September 1, 1954), "Diels-Alder Reaction. II. Experiments with 2-Styrylchromones. On the Nature of the Dimer of 1,3-Diphenylisobenzofuran", Journal of the American Chemical Society, vol. 76, no. 18, pp. 4576–4577, Bibcode:1954JAChS..76.4576S, doi:10.1021/ja01647a020
  26. ^ Soman, Rahul; Raghav, Darpan; Sujatha, Subramaniam; Rathinasamy, Krishnan; Arunkumar, Chellaiah (30 Jun 2015). "Axial ligand modified high valent tin(iv) porphyrins: synthesis, structure, photophysical studies and photodynamic antimicrobial activities on Candida albicans". RSC Adv. 5 (75): 61103. Bibcode:2015RSCAd...561103S. doi:10.1039/C5RA09343K.
  27. ^ "Grundpraktikum Physikalische Chemie, V28, Photooxidation von Diphenylisobenzofuran, Untersuchung der Reaktionskinetik durch Photometrie" (PDF) (in German). Universität Ulm. 2010-12-06. Archived from the original (PDF) on 2017-05-17. Retrieved 2017-08-30.
  28. ^ C. Schmitz; J.M. Aubry; J. Rigaudy (1982), "A new access to the anthracene core: Synthesis of two water soluble singlet oxygen traps derived from 1,3-diphenylisobenzofuran and 9,10-diphenylanthracene", Tetrahedron, vol. 38, no. 10, pp. 1425–1430, doi:10.1016/0040-4020(82)80224-X
  29. ^ D. Tobia; B. Rickborn (1987), "Substituent effects on rates of inter- and intramolecular cycloaddition reactions of isobenzofurans", Journal of Organic Chemistry, vol. 52, no. 12, pp. 2611–2615, doi:10.1021/jo00388a055
  30. ^ G. Wittig (1963), "Über kleine Ringe mit Kohlenstoffdreifachbindung – noch eine Chemie des "Als ob"", Pure Appl. Chem. (in German), vol. 7, no. 2–3, pp. 173–192, doi:10.1351/pac196307020173, S2CID 95499778
  31. ^ G. Wittig; E. Knauss; K. Niethamer (1960), "Über 9,10-Dihydroanthracen-Derivate mit Heterobrückenatomen", Justus Liebigs Ann. Chem. (in German), vol. 630, no. 1, pp. 10–18, doi:10.1002/jlac.19606300103
  32. ^ R. Breslow; M. Oda (1972), "Isolation and characterization of pure cyclopropenone", Journal of the American Chemical Society, vol. 94, no. 13, pp. 4787–4788, Bibcode:1972JAChS..94.4787B, doi:10.1021/ja00768a089
  33. ^ "Exo selectivity of the Diels-Alder addition of cyclopropenone and 1-3-diphenylisobenzofuran". Retrieved 2017-08-28.
  34. ^ J.A. Berson (1953), "Reactions of 1,3-diphenylisobenzofuran with acetylenic dienophiles", Journal of the American Chemical Society, vol. 75, no. 5, pp. 1240–1241, Bibcode:1953JAChS..75.1240B, doi:10.1021/ja01101a503
  35. ^ M.P. Cava; J.P. VanMeter (1969), "Condensed cyclobutane aromatic compounds. XXX. Synthesis of some unusual 2,3-naphthoquinonoid heterocycles. A synthetic route to derivatives of naphtho[2,3-b]biphenylene and anthra[b]cyclobutene", Journal of Organic Chemistry. Org. Chem., vol. 34, no. 3, pp. 538–545, doi:10.1021/jo01255a012
  36. ^ Houben-Weyl Science of Synthesis (2009), Compounds with All-Carbon Functions, vol. 45b, Stuttgart: Thieme, p. 1038, ISBN 978-3-13-146551-1
  37. ^ G.P. Miller; J. Briggs (2002), "Progress towards the synthesis of tris- and tetrakis[60]fullerene adducts", Electrochem. Soc. Proc., vol. 2002–12, pp. 279–284, ISBN 1-56677-333-4
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