Perfluorocycloalkene

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A perfluorocycloalkene (PFCA) fluorocarbon structure with a cycloalkene core. PFCAs have shown reactivity with a wide variety of nucleophiles including phenoxides, alkoxides, organometallic, amines, thiols, and azoles. [1] They or their derivatives are reported to have nonlinear optical activity, [2] and be useful as lubricants, [3] etching agents, [4] components of fuel cells, [5] low-dielectric materials, and superhydrophobic and oleophobic coatings. [6]

Reactivity

Derivatization of these PFCA rings via displacement of fluorine atoms with nucleophiles occurs through an addition-elimination reaction in the presence of a base. Attack of the nucleophile on the PFCA ring generates a carbanion which can eliminate a fluoride ion, resulting in vinyl substituted and allyl substituted products (Scheme 1). The ratio of vinylic to allylic products depends on the ring size, reaction conditions, and nucleophile. [1] [7]

Scheme 1: Derivatization of the PFCA ring Mechanism1.pdf
Scheme 1: Derivatization of the PFCA ring

Under favorable conditions, a good nucleophile can replace all the fluorine atoms on PFCA ring (Scheme 2). [8]

Scheme 2: Multi-substitution of imidazole or 1,2,4-triazole onto PFCA ring Multi-substitution on PFCA ring.jpg
Scheme 2: Multi-substitution of imidazole or 1,2,4-triazole onto PFCA ring

PFCAs have a huge potential to be used as a monomer to produce a variety of polymers. The polycondensation of bisphenols with PFCAs can be done. A unique class of aromatic ether polymers containing perfluorocyclopentenyl (PFCP) enchainment was prepared from the simple step-growth polycondensation of commercial available bisphenols and octafluorocyclopentene (OFCP) in the presence of triethylamine (Scheme 3 and 4). [6] [9]

Scheme 3. Perfluorocyclopentenyl (PFCP) aryl ether polymer synthesis Perfluorocyclopentenyl (PFCP) aryl ether polymer synthesis.jpg
Scheme 3. Perfluorocyclopentenyl (PFCP) aryl ether polymer synthesis
Scheme 4. Bis(heptafluorocyclopentenyl) aryl ether monomers synthesis and polymerization Bis(heptafluorocyclopentenyl) aryl ether monomers synthesis and polymerization.jpg
Scheme 4. Bis(heptafluorocyclopentenyl) aryl ether monomers synthesis and polymerization

Fluoropolymers, namely, perfluorocyclohexenyl (PFCH) aryl ether polymers, may be formed via step-growth polycondensation of commercial bisphenols and decafluorocycloalkene (DFCH) in the presence of triethylamine (Scheme 5). [7] [10]

Scheme 5. Perfluorocycloalkenyl (PFCA) aryl ether polymer synthesis Perfluorocycloalkenyl (PFCA) aryl ether polymer synthesis.jpg
Scheme 5. Perfluorocycloalkenyl (PFCA) aryl ether polymer synthesis

References

  1. 1 2 3 4 Wigglesworth, Tony J.; Sud, David; Norsten, Tyler B.; Lekhi, Vikram S.; Branda, Neil R. (2005). "Chiral Discrimination in Photochromic Helicenes". Journal of the American Chemical Society. 127 (20): 7272–3. Bibcode:2005JAChS.127.7272W. doi:10.1021/ja050190j. PMID   15898750.
  2. ↑ Matsui, Masaki; Tsuge, Michinori; Funabiki, Kazumasa; Shibata, Katsuyoshi; Muramatsu, Hiroshige; Hirota, Kazuo; Hosoda, Masahiro; Tai, Kazuo; Shiozaki, Hisayoshi; Kim, Misa; Nakatsu, Kazumi (1999). "Synthesis of azo chromophores containing a perfluorocyclo-alkenyl moiety and their second-order optical nonlinearity". Journal of Fluorine Chemistry. 97 (1–2): 207–12. Bibcode:1999JFluC..97..207M. doi:10.1016/S0022-1139(99)00050-0.
  3. ↑ "Organometallic Derivatives Of Perfluorocycloalkenes - Minnesota Mining Mfg Co,Us". Freepatentsonline.com. 1971-08-25. Retrieved 2017-01-05.
  4. ↑ Takahashi, Kazuo; Itoh, Atsushi; Nakamura, Toshihiro; Tachibana, Kunihide (2000). "Radical kinetics for polymer film deposition in fluorocarbon (C4F8, C3F6 and C5F8) plasmas". Thin Solid Films. 374 (2): 303–10. Bibcode:2000TSF...374..303T. doi:10.1016/S0040-6090(00)01160-3.
  5. ↑ "Patent US20140162173 - Sulfonated perfluorocyclopentenyl polymers and uses thereof - Google Patents". Google.com. 2013-10-09. Retrieved 2017-01-05.
  6. 1 2 Sharma, Babloo; Verma, Rajneesh; Baur, Cary; Bykova, Julia; Mabry, Joseph M.; Smith, Dennis W. (2013). "Ultra low dielectric, self-cleansing and highly oleophobic POSS-PFCP aryl ether polymer composites". Journal of Materials Chemistry C. 1 (43): 7222–7. doi:10.1039/C3TC31161A.
  7. 1 2 3 Sharma, Babloo; Faisal, Mohammad; Liff, Shawna M.; Smith, Dennis W. (2014). "Triarylamine-enchained semifluorinated perfluorocycloalkenyl (PFCA) aryl ether polymers". Applied Petrochemical Research. 5: 35. doi: 10.1007/s13203-014-0063-0 .
  8. 1 2 Garg, Sonali; Twamley, Brendan; Zeng, Zhuo; Shreeve, Jean'ne M. (2009). "Azoles as Reactive Nucleophiles with Cyclic Perfluoroalkenes". Chemistry: A European Journal. 15 (40): 10554–62. doi:10.1002/chem.200901508. PMID   19746368.
  9. 1 2 3 Cracowski, Jean-Marc; Sharma, Babloo; Brown, Dakarai K.; Christensen, Kenneth; Lund, Benjamin R.; Smith, Dennis W. (2012). "Perfluorocyclopentenyl (PFCP) Aryl Ether Polymers via Polycondensation of Octafluorocyclopentene with Bisphenols". Macromolecules. 45 (2): 766–71. Bibcode:2012MaMol..45..766C. doi:10.1021/ma2024599.
  10. 1 2 Sharma, Babloo; Hill, Sarah C.; Liff, Shawna M.; Pennington, William T.; Smith, Dennis W. (2014). "Perfluorocyclohexenyl aryl ether polymers via polycondensation of decafluorocyclohexene with bisphenols". Journal of Polymer Science Part A: Polymer Chemistry. 52 (2): 232–8. Bibcode:2014JPoSA..52..232S. doi:10.1002/pola.26995.
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