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 super hydrophobic and oleophobic coatings.[6]
Examples of perfluorocycloalkenes
Tetrafluorocyclopropene
Hexafluorocyclobutene
Octafluorocyclopentene
Decafluorocyclohexene
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]
PFCAs have a huge potential to be used as a monomer to produce a variety of polymers. The first time, Smith et al. showed the
polycondensation of bisphenols with PFCAs. 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]
Smith et al. further extended his recently published work on perfluorocyclopentenyl (PFCP) aryl ether polymers and perfuorocycloalkenyl (PFCA) aryl ether monomers, and reported the synthesis of a new class of fluoropolymers, namely, perfluorocyclohexenyl (PFCH) aryl ether polymers, via step-growth polycondensation of commercial bisphenols and decafluorocycloalkene (DFCH) in the presence of triethylamine (Scheme 5).[7][10]
^
abcdWigglesworth, 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.
doi:
10.1021/ja050190j.
PMID15898750.
^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.
doi:
10.1016/S0022-1139(99)00050-0.