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Benzisoxazole

From Wikipedia, the free encyclopedia
Not to be confused with2,1-Benzisoxazole.
Benzisoxazole
Skeletal formula with numbering convention
Ball-and-stick molecular model
Space-filling molecular model
Names
Preferred IUPAC name
1,2-Benzoxazole
Other names
Benzo[d]isoxazole; Indoxazine
Identifiers
3D model (JSmol)
2154
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard100.005.440Edit this at Wikidata
EC Number
  • 205-983-1
UNII
  • InChI=1S/C7H5NO/c1-2-4-7-6(3-1)5-8-9-7/h1-5H checkY
    Key: KTZQTRPPVKQPFO-UHFFFAOYSA-N checkY
  • InChI=1/C7H5NO/c1-2-4-7-6(3-1)5-8-9-7/h1-5H
    Key: KTZQTRPPVKQPFO-UHFFFAOYAI
  • n2oc1ccccc1c2
Properties
C7H5NO
Molar mass119.123 g·mol−1
AppearanceColorless liquid
Density1.18 g/cm3
Boiling point35 to 38 °C (95 to 100 °F; 308 to 311 K) (at 2.67 hPa)
101-102 °C (at 2 kPa)
Hazards
GHS labelling:
GHS07: Exclamation mark
Warning
H315,H319,H335
P261,P264,P271,P280,P302+P352,P304+P340,P305+P351+P338,P312,P321,P332+P313,P337+P313,P362,P403+P233,P405,P501
Flash point58 °C (136 °F; 331 K)
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)
Chemical compound

1,2-Benzisoxazole is anaromaticorganic compound with a molecular formula C7H5NO containing abenzene-fusedisoxazole ring structure.[1][2] The compound itself has no common applications; however, functionalizedbenzisoxazoles andbenzisoxazoyls have a variety of uses, including pharmaceutical drugs such as some antipsychotics (includingrisperidone,paliperidone,ocaperidone, andiloperidone) and the anticonvulsantzonisamide.

Itsaromaticity makes it relatively stable;[3] however, it is only weakly basic.

Synthesis

[edit]

Benzisoxazole may be prepared from inexpensivesalicylaldehyde, via a base catalyzed room temperature reaction withhydroxylamine-O-sulfonic acid.[4]

Synthesis of 1,2-Benzisoxazol aus Salicylaldehyd und HOSA
Synthesis of 1,2-Benzisoxazol aus Salicylaldehyd und HOSA

Reactions

[edit]

Kemp elimination

[edit]

First reported byDaniel S. Kemp,[5][6][7] the relatively weak N-O bond can be cleaved by a strong base to yield a 2-hydroxybenzonitrile species.

See also

[edit]
Structural isomers

References

[edit]
  1. ^Katritzky, A. R.; Pozharskii, A. F. (2000).Handbook of Heterocyclic Chemistry (2nd ed.). Academic Press.ISBN 0080429882.
  2. ^Clayden, J.; Greeves, N.; Warren, S.; Wothers, P. (2001).Organic Chemistry. Oxford, Oxfordshire: Oxford University Press.ISBN 0-19-850346-6.
  3. ^Domene, Carmen; Jenneskens, Leonardus W.; Fowler, Patrick W. (2005). "Aromaticity of anthranil and its isomers, 1,2-benzisoxazole and benzoxazole".Tetrahedron Letters.46 (23):4077–4080.doi:10.1016/j.tetlet.2005.04.014.hdl:1874/14837.ISSN 0040-4039.
  4. ^Kemp, D.S.; Woodward, R.B. (1965). "The N-ethylbenzisoxazolium cation—I".Tetrahedron.21 (11):3019–3035.doi:10.1016/S0040-4020(01)96921-2.ISSN 0040-4020.
  5. ^Casey, Martha L.; Kemp, D. S.; Paul, Kenneth G.; Cox, Daniel D. (June 1973). "Physical organic chemistry of benzisoxazoles. I. Mechanism of the base-catalyzed decomposition of benzisoxazoles".The Journal of Organic Chemistry.38 (13):2294–2301.doi:10.1021/jo00953a006.
  6. ^Kemp, D. S.; Cox, Daniel D.; Paul, Kenneth G. (December 1975). "Physical organic chemistry of benzisoxazoles. IV. Origins and catalytic nature of the solvent rate acceleration for the decarboxylation of 3-carboxybenzisoxazoles".Journal of the American Chemical Society.97 (25):7312–7318.doi:10.1021/ja00858a018.
  7. ^Kemp, Daniel S. (April 1970). "Decarboxylation of benzisoxazole-3-carboxylic acids. Catalysis by extraction of possible relevance to the problem of enzymic mechanism".Journal of the American Chemical Society.92 (8):2553–2554.doi:10.1021/ja00711a061.
1 ring
Three-membered
Five-membered
Six-membered
Seven-membered
Nine-membered
18-membered
2 rings
Five + Five
Five + Six
Six + Six
Five + Seven
Stimulants
Depressants
Hallucinogens
Entactogens
Psychiatric drugs
Others
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