Basketene (IUPAC name: pentacyclo[4.4.0.02,5.03,8.04,7]dec-9-ene[1]) is an organic compound with the formula C10H10. It is a polycyclic alkene and the dehydrogenated version of basketane, which was named for its structural similarity to a basket. Due to its hydrocarbon composition and unique structure, the chemical compound is of considerable interest to those examining energy surfaces of these (CH)10 cage molecules and what possible factors influence their minima.[2] Additionally, the complex structure of this compound has intrigued researchers studying the chemistry of highly strained ring systems .[3] Basketene and its family of derivatives also have important chemical and physical properties. These molecules all tend to have a high standard enthalpy of formation, combined with their high density, leading to possible uses in explosives.[4]

Basketene
Skeletal formula
Ball-and-stick model
Names
Preferred IUPAC name
Pentacyclo[4.4.0.02,5.03,8.04,7]dec-9-ene
Other names
Bishomocubene
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/C10H10/c1-2-4-7-5-3(1)6-8(4)10(7)9(5)6/h1-10H
    Key: LXQOIQYQFRKBLV-UHFFFAOYSA-N
  • InChI=1/C10H10/c1-2-4-7-5-3(1)6-8(4)10(7)9(5)6/h1-10H
  • C2=CC5C1C4C3C1C2C3C45
Properties
C10H10
Molar mass 130.186 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Synthesis

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Basketene has been synthesized by the isomerization of cyclooctatetraene followed by a Diels–Alder reaction with maleic anhydride. [2 + 2] cycloaddition closes the cage structure, which is converted to basketene by saponification and decarboxylation.[5] For a more indepth explanation of the synthesis, we start with the commercially available cyclooctatetraene (1), where it undergoes a thermal electrocyclic ring closure 2. Then from 2, a Diels-Alder reaction between 2 and maleic anhydride (3) the tricyclic structure 4. Subsequent [2+2] cycloaddition under photochemical conditions leads to 5. Following saponification with 5 and sodium carbonate gives 6. Finally, through oxidative decarboxylation with Lead(IV) acetate forms the final product, Basketene (7).

 

Reactions

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Families of (CH)n hydrocarbons are characterized by the multiple rearrangements into one another that their members can undergo. These rearrangements can be initiated thermally, photochemically, or under metal catalysis conditions.[6] Basketene and other cage molecules are important for discovering and testing new concepts of bonding and reactivity.[4] Trials with different reagents and reaction conditions have allowed researchers to understand the chemistry of these complex ring systems and how these (CH)10 systems rearrange.[7]


In this reaction using basketene, Nenitzescu’s Hydrocarbon can be obtained. Starting with Basktene, the reaction proceeds through a reverse Diels-Alder intermediate in order to give 8 at 110 ˚C. From 8, a 3,3 shift occurs to give Nenitzescu's hydrocarbon (9). [2]


 

Basketene can also undergo the following thermal and photochemical rearrangement reactions. Starting with Basketene, tricyclo[4.4.0.02,5]deca-3,7,9-triene (8) was captured by trapping it as a 1:1 adduct with maleic anhydride. Then photo inducing a conrotary opening of 8 gives cis,cis,trans-cyclooctatriene (10). Furthermore, the photo arrangement of 10 provides the derivative (11). As shown above, 11 will undergo a direct photochemical (2+2) cyclization closure to 12.

 

Basktene also rearranges into Snoutene when in solution with Silver nitrate

 

References

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  1. ^ Verevkin, Sergei P.; Martin Kümmerlin; Ernst Hickl; Hans-Dieter Beckhaus; Christoph Rüchardt; Sergei I. Kozhushkov; Rainer Haag; Roland Boese; Jordi Benet-Bucholz; Karsten Nordhoff; Armin de Meijere (2002). "Thermochemical and X-ray Crystallographic Investigations of Some (CH)10 Hydrocarbons: Basketene, Nenitzescu's Hydrocarbon, and Snoutene". European Journal of Organic Chemistry. 2002 (14). Wiley VCH: 2280–7. doi:10.1002/1099-0690(200207)2002:14<2280::AID-EJOC2280>3.0.CO;2-R. Archived from the original on 2013-01-05. Retrieved 2009-11-23.
  2. ^ a b Allred, Evan L.; Beck, Boyd R. (1973). "Concurrent thermolysis and photolysis of basketene. Formation and the interrelation of some new (CH)10 isomers". Journal of the American Chemical Society. 95 (7). doi:10.1021/ja00788a065.
  3. ^ Gassman, Paul G.; Yamaguchi, Ryohei (1978). "1,8-Bishomocubane". Journal of Organic Chemistry. 43 (24). doi:10.1021/jo00418a028.
  4. ^ a b Aydinli, Betül; Çelik, Murat; M. Serdar, Gültekin; Uzun, Orhan; Balci, Metin (2003). "Controlled Synthesis of Substituted Benzobasketene Derivatives". Helvetica Chimica Acta. 86.
  5. ^ Smit, W. A.; Bochkov, A. F.; Caple, R. (1998). Organic Synthesis: The Science Behind the Art. The Royal Society of Chemistry. p. 184.
  6. ^ Gajewski, J.J. (1981). Hydrocarbon Thermal Isomerizations. New York: Academic Press.
  7. ^ Verevkin, Sergei P.; Kümmerlin, Martin; Hickl, Ernst; Beckhaus, Hans-Dieter; Rüchardt, Christoph; Kozhushkov, Sergei I.; Haag, Rainer; Boese, Roland; Bucholz, Jordi-Benet; Nordhoff, Karsten; de Meijere, Armin (2002). "Thermochemical and X-ray Crystallographic Investigations of Some (CH)10 Hydrocarbons: Basketene, Nenitzescu's Hydrocarbon, and Snoutene". European Journal of Organic Chemistry. 2002 (14). doi:10.1002/1099-0690.