Chemistry:N-Hydroxyphthalimide

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N-Hydroxyphthalimide
N-Hydroxyphthalimid Struktur.svg
Names
Preferred IUPAC name
2-Hydroxy-1H-isoindole-1,3(2H)-dione
Identifiers
3D model (JSmol)
ChEMBL
ChemSpider
EC Number
  • 208-358-1
UNII
Properties
C8H5NO3
Molar mass 163.132 g·mol−1
Appearance white to pale yellow crystalline solid
Density 1.64 g/mL
Melting point 233°C
Boiling point 370°C
water, polar organic solvents
Hazards
GHS pictograms GHS07: Harmful
GHS Signal word Warning
H315, H319, H335
P261, P264, P271, P280, P302+352, P304+340, P305+351+338, P312, P321, P332+313, P337+313, P362, P403+233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
Tracking categories (test):

N-Hydroxyphthalimide is the N-hydroxy derivative of phthalimide. The compound can be utilized as a catalyst for oxidation reactions, in particular for the selective oxidation (e. g. alkanes to alcohols) with molecular oxygen under mild conditions.[1][2]

Occurrence and production

The synthesis of N-hydroxyphthalimide from phthaloyl chloride and hydroxylamine hydrochloride in the presence of sodium carbonate in aqueous solution was first reported by Lassar Cohn in 1880 (referred to as "Phthalylhydroxylamin").[3]

Synthesis of N-hydroxyphthalimide from phthaloyl chloride using hydroxylamine hydrochloride

The product forms as a red sodium salt under basic conditions, while white N-hydroxyphthalimide precipitates in 55% yield as the solution is acidified. N-hydroxyphthalimide is also produced by reacting hydroxylamine hydrochloride with diethyl phthalate in the presence of sodium acetate,[4] or with phthalic anhydride in the presence of sodium carbonate with heating. In the last case, an overall yield of 76% is produced following purification by recrystallization.[5]

Microwave irradiation of phthalic anhydride and hydroxylamine hydrochloride in pyridine produces N-hydroxyphthalimide in 81% yield.[6] Even in the absence of a base, phthalic anhydride and hydroxylamine phosphate react to produce N-hydroxyphthalimide in 86% yield when heated to 130 °C.[7]

Preparation of N-hydroxyphthalimide from phthalic anhydride

Properties

N-Hydroxyphthalimide is a colorless to yellow, odorless crystalline powder which is soluble in water and organic solvents such as acetic acid, ethyl acetate and acetonitrile.[8] The compound exists in two different-colored monoclinic crystal forms. In case of the colorless white form, the NOH group is rotated about 1.19° from the plane of the molecule, while in the yellow form it is much closer to planarity (0.06° rotation).[9]

The color of the synthesized N-hydroxyphthalimide depends on the type of solvent used; the color transition from white to yellow is irreversible.[10] N-Hydroxyphthalimide forms strongly colored, mostly yellow or red salts with alkali and heavy metals, ammonia and amines.[11] Hydrolysis of N-hydroxyphthalimide by the addition of strong bases produces phthalic acid monohydroxamic acid by adding water across one of the carbon–nitrogen bonds.[4] N-Hydroxyphthalimide ethers, on the other hand, are colorless and provide O-alkylhydroxylamines by alkaline hydrolysis or cleavage through hydrazine hydrate.

The "phthalylhydroxylamine" reported by Cohn was known to have a molecular formula of C8H5NO3 but the exact structure was not known.[3] Three possibilities were discussed and are shown in the Figure below: a mono-oxime of phthalic anhydride ("phthaloxime", I), an expanded ring with two heteroatoms, (2,3-benzoxazine-1,4-dione, II), and N-hydroxyphthalimide (III).[10][12] It was not until the 1950s that Cohn's product was definitely shown to be N-hydroxyphthalimide (III).[13]

Three structural isomers of C8H5NO3 considered as Cohn's "phthalylhydroxylamine"

Applications and reactions

Nefkens and Tesser developed a technique for generating active esters from N-hydroxyphthalimide[14] for use in peptide synthesis,[15] an approach later extended to using N-hydroxysuccinimide.[16] The ester linkage is formed between the N-hydroxyphthalimide and a carboxylic acid by elimination of water, the coupling achieved with N,N′-dicyclohexylcarbodiimide (DCC). For peptide synthesis, the N-terminus of the growing peptide is protected with tert-butyloxycarbonyl while its C-terminus (Z–NH–CH(R)–COOH) is coupled to N-hydroxyphthalimide. An ester of the next amino acid in the desired peptide sequence is shaken with activated ester, adding to the chain and displacing the N-hydroxyphthalimide. This reaction is quantitative and nearly instantaneous at 0 °C.[15][17] The resulting ester needs to be hydrolysed before the cycle can be repeated.

Conversion of the C-terminus of a peptide to an active ester of N-hydroxyphthalimide

The N-hydroxyphthalimide can be removed by shaking with sodium bicarbonate,[15] but the N-hydroxysuccinimide approach shows greater reactivity and convenience, and is generally preferred.[16][17]

Esters of N-hydroxyphthalimide and activated sulfonic acids such as trifluoromethanesulfonic anhydride or p-toluenesulfonyl chloride are used as so-called photoacids, which split off protons during UV irradiation.

UV reaction with NHPI triflate

The protons generated serve for the targeted local degradation of acid-sensitive photoresists.[18]

N-Hydroxyphthalimide can be converted with vinyl acetate in the presence of palladium(II)acetate to the N-vinyloxyphthalimide, which is quantitatively hydrogenated to N-ethoxyphthalimide and after purified by cleavage, yielding O-ethylhydroxylamine.[19]

Synthesis of O-alkoxyamines via N-hydroxyphthalimides

A variety of different functional groups can be oxidized with the aminoxyl radical (phthalimide-N-oxyl, PINO)[20] formed by the abstraction of a hydrogen atom from N-hydroxyphthalimide under gentle conditions (similar to TEMPO):[1]

Formation of the PINO radical

Using molecular oxygen alkanes can be oxidized to form alcohols, secondary alcohols to ketones, acetals to esters and alkenes to epoxides.[21][22][23] Amides can be converted into carbonyl compounds with N-hydroxyphthalimide and cobalt(II)salts under mild conditions.[24]

Oxidation of amides with N-hydroxyphthalimide

Efficient oxidation reactions of precursors of important basic chemicals are of particular technical interest. For example, ε-caprolactam can be prepared using NHPI from the so-called KA oil ("ketone-alcohol" oil, a mixture of cyclohexanol and cyclohexanone) which is obtained during the oxidation of cyclohexane. The reaction proceeds via cyclohexanol hydroperoxide which reacts with ammonia to give peroxydicyclohexylamine followed by a rearrangement in the presence of catalytic amounts of lithium chloride.[22][25]

Oxidation of KA oil to caprolactam

The use of N-hydroxyphthalimide as a catalyst in the oxidation of KA oil avoids the formation of the undesirable by-product ammonium sulfate which is produced by the conventional ε-caprolactam synthesis (Beckmann rearrangement of cyclohexanone oxime with sulfuric acid).

Alkanes are converted into nitroalkanes in the presence of nitrogen dioxide.[26]

Nitrogenation/oxidation of cyclohexane by means of NHPI

Cyclohexane is converted at 70 °C with nitrogen dioxide/air into a mixture of nitrocyclohexane (70%), cyclohexyl nitrate (7%) and cyclohexanol (5%).

Furthermore, applications of N-hydroxyphthalimide as oxidizing agents in photographic developers[27] and as charge control agents in toners[28] have been described in the patent literature.

Phthalimido-N-oxyl (PINO)

The radical derived by removal of a hydrogen atom from N-hydroxyphthalimide is called N-phthalimido-N-oxyl, acronym being PINO. It is a powerful H-atom abstracting agent.[1] The bond dissociation energy of NHPI (i.e., PINO–H) is 88–90 kcal/mol (370–380 kJ/mol), depending on the solvent.[29]

References

  1. ↑ 1.0 1.1 1.2 Recupero, Francesco; Punta, Carlo (2007). "Free Radical Functionalization of Organic Compounds Catalyzed by N-Hydroxyphthalimide". Chem. Rev. 107 (9): 3800–3842. doi:10.1021/cr040170k. PMID 17848093. 
  2. ↑ Melone, Lucio; Punta, Carlo (2013). "Metal-free aerobic oxidations mediated by N-hydroxyphthalimide. A concise review". Beilstein J. Org. Chem. 9: 1296–1310. doi:10.3762/bjoc.9.146. PMID 23843925. 
  3. ↑ 3.0 3.1 Cohn, Lassar (1880). "Phthalylhydroxylamin: Ueberführung der Phthalsäure in Salicylsäure" (in German). Justus Liebigs Ann. Chem. 205 (3): 295–314. doi:10.1002/jlac.18802050304. https://zenodo.org/record/1447361. 
  4. ↑ 4.0 4.1 Bauer, Ludwig; Miarka, Stanley V. (1957). "The Chemistry of N-Hydroxyphthalimide". J. Am. Chem. Soc. 79 (8): 1983–1985. doi:10.1021/ja01565a061. 
  5. ↑ Gross, H.; Keitel, I. (1969). "Zur Darstellung von N-Hydroxyphthalimid und N-Hydroxysuccinimid" (in German). J. Prakt. Chem. 311 (4): 692–693. doi:10.1002/prac.19693110424. 
  6. ↑ Sugamoto, Kazuhiro; Matsushita, Yoh‐ichi; Kameda, Yu‐hei; Suzuki, Masahiko; Matsui, Takanao (2005). "Microwave‐assisted Synthesis of N‐Hydroxyphthalimide Derivatives". Synth. Commun. 35 (1): 67–70. doi:10.1081/SCC-200046498. 
  7. ↑ Elke Fritz-Langhals, "Verfahren zur Herstellung cyclischer N-Hydroxy-dicarboximide [Process for the preparation of cyclic N-hydroxydicarboximides]", EP patent application 1085013, published 2001-03-21
  8. ↑ Gambarotti, Cristian; Punta, Carlo; Recupero, Francesco; Zlotorzynska, Maria; Sammis, Glenn (2013). "N-Hydrophthalimide". Encyclopedia of Reagents for Organic Synthesis. doi:10.1002/047084289X.rn00598.pub2. ISBN 978-0471936237. 
  9. ↑ Reichelt, Hendrik; Faunce, Chester A.; Paradies, Henrich H. (2007). "Elusive forms and structures of N-hydroxyphthalimide: The colorless and yellow crystal forms of N-hydroxyphthalimide". J. Phys. Chem. A 111 (13): 2587–2601. doi:10.1021/jp068599y. PMID 17388355. Bibcode: 2007JPCA..111.2587R. 
  10. ↑ 10.0 10.1 Ames, D. E.; Grey, T. F. (1955). "N-Hydroxy-imides. Part II. Derivatives of homophthalic and phthalic acid". J. Chem. Soc.: 3518–3521. doi:10.1039/JR9550003518. 
  11. ↑ Porcheddu, Andrea; Giacomelli, Giampaolo (2009). "Synthesis of oximes and hydroxamic acids". in Rappaport, Zvi; Lieberman, Joel F.. The Chemistry of Hydroxylamines, Oximes, and Hydroxamic Acids, Part 1. Chichester: John Wiley & Sons. pp. 224–226. ISBN 978-0-470-51261-6. 
  12. ↑ Bradly, Oscar L.; Baker, Leslie C.; Goldstein, Richard F.; Harris, Samuel (1928). "LXVIII.—The isomerism of the oximes. Part XXXIII. The oximes of opianic acid and of phthalic anhydride". J. Chem. Soc.: 529–539. doi:10.1039/JR9280000529. 
  13. ↑ Hurd, Charles D.; Buess, Charles M.; Bauer, Ludwig (1954). "Succino- and phthalo-hydroxamic acids". J. Org. Chem. 19 (7): 1140–1149. doi:10.1021/jo01372a021. 
  14. ↑ Nefkens, G. H. L.; Tesser, G. I.; Nivard, R. J. F. (1962). "Synthesis and reactions of esters of N-hydroxyphthalimide and N-protected amino acids". Recl. Trav. Chim. Pays-Bas 81 (8): 683–690. doi:10.1002/recl.19620810807. 
  15. ↑ 15.0 15.1 15.2 Nefkens, G. H. L.; Tesser, G. I. (1961). "A Novel Activated Ester in Peptide Synthesis". J. Am. Chem. Soc. 83 (5): 1263. doi:10.1021/ja01466a068. 
  16. ↑ 16.0 16.1 Anderson, George W.; Zimmerman, Joan E.; Callahan, Francis M. (1964). "The Use of Esters of N-Hydroxysuccinimide in Peptide Synthesis". J. Am. Chem. Soc. 86 (9): 1839–1842. doi:10.1021/ja01063a037. 
  17. ↑ 17.0 17.1 Bodanszky, Miklos (1993). "Activation and Coupling". Principles of Peptide Synthesis (2nd ed.). Springer-Verlag. pp. 9–61. doi:10.1007/978-3-642-78056-1_2. ISBN 9783642780561. https://books.google.com/books?id=nvHvCAAAQBAJ&pg=PA34. 
  18. ↑ K. Elian, E. Günther, R. Leuschner, "Chemisch verstärkter Resist für die Elektronenstrahllithografie", EP patent 0919867, published 2003-05-21
  19. ↑ D.M.C. Callant, A.M.C.F. Castelijns, J.G. De Vries, "Cyclic N-alkenyloxyimides and a method for the preparation of cyclic N-alkenyloxyimides, the corresponding cyclic N-alkoxyimides and O-alkoxyamines", WO patent 1995025090, published 1995-09-21
  20. ↑ S. Coseri (2009), "Phthalimide‐N‐oxyl (PINO) Radical, a Powerful Catalytic Agent: Its Generation and Versatility Towards Various Organic Substrates", Catal. Rev. Sci. Eng. 51 (2): 218–292, doi:10.1080/01614940902743841 
  21. ↑ Y. Ishii, K. Nakayama, M. Takeno, S. Sakaguchi, T. Iwahama, Y. Nishiyama (1995), "Novel Catalysis by N-Hydroxyphthalimide in the Oxidation of Organic Substrates by Molecular Oxygen", J. Org. Chem. 60 (13): 3934–3935, doi:10.1021/jo00118a002 
  22. ↑ 22.0 22.1 "Discovery of a carbon radical producing catalyst and its application to organic synthesis". Tokyo Chemical Industry Co. Ltd.. April 2003. http://www.tcichemicals.com/de/de/support-download/tcimail/backnumber/article/116drE.pdf. Retrieved 2016-08-11. 
  23. ↑ B.B. Wentzel, M.P.J. Donners, P.L. Alsters, M.C. Feiters, R.J.M. Nolte (2000), "N-Hydroxyphthalimide/cobalt(II) catalyzed low temperature benzylic oxidation using molecular oxygen", Tetrahedron 56 (39): 7797–7803, doi:10.1016/S0040-4020(00)00679-7 
  24. ↑ F. Minisci, C. Punta, F. Recupero, F. Fontana, G.F. Pedulli (2002), "Aerobic Oxidation of N-Alkylamides Catalyzed by N-Hydroxyphthalimide under Mild Conditions. Polar and Enthalpic Effects", J. Org. Chem. 67 (8): 2671–2676, doi:10.1021/jo016398e, PMID 11950315 
  25. ↑ O. Fukuda, S. Sakaguchi, Y. Ishii (2001), "A new strategy for catalytic Baeyer-Villiger oxidation of KA-oil with molecular oxygen using N-hydroxyphthalimide", Tetrahedron Lett. 42 (20): 3479–3481, doi:10.1016/S0040-4039(01)00469-5 
  26. ↑ S. Sakaguchi, Y. Nishiwaki, T. Kitamura, Y. Ishii (2001), "Efficient catalytic alkane nitration with NO2 under air assisted by N-hydroxyphthalmide", Angew. Chem., Int. Edit. 40 (1): 222–224, doi:10.1002/1521-3773(20010105)40:1<222::AID-ANIE222>3.0.CO;2-W 
  27. ↑ & T. Sampei"Method of processing silver halide photographic lightsensitive material" EP patent application 0664479, published 1994-07-26, assigned to Konica Corp.
  28. ↑ ; S.M. Bonser & H.W. Osterhoudt"Electrostatographic dry toner and developer compositions with hydroxyphthalimide" US patent 5332637, issued 1994-07-26, assigned to Eastman Kodak Co.
  29. ↑ Coseri, Sergiu (2009). "Phthalimide‐N‐oxyl (PINO) Radical, a Powerful Catalytic Agent: Its Generation and Versatility Towards Various Organic Substrates". Catalysis Reviews 51 (2): 218–292. doi:10.1080/01614940902743841. 



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