Synthesis of carbon-labeled perfluoroalkyl compounds
View Patent ↗Various 13 C and 14 C carbon labeled compounds R f — b CF(U) y (T) z Formula 1A or R f — b CF 2 b CF(U) y (T) z Formula 1B wherein R f is a linear or branched perfluoroalkyl radical Z(C m F 2m )—, m is 1, 3 to 20, or a mixture thereof; Z is F when m is 1, and Z is F, Cl, or H when m is 3 to 20 or a mixture thereof; b is 13 or 14; y is 1, and z is 0 or 1; and when y and z are each 1, U is F, and T is selected from the group consisting of monovalent radicals —X wherein X is I or Br, —CH 2 —CH 2 —X, —CH═CH 2 , —CH 2 —CH 2 —OH, —CH 2 —COOH, —CH 2 OH, — b CH 2 OH, —COOH, — b COOH, —O—CF(CF 3 )—C(O)F, —O—CF(CF 3 )—X, —SO 2 Y wherein Y is H, F or Cl, and —SO 3 H; and when y is 1, and z is 0, U is selected from the group consisting of divalent radicals ═CH—COOH, ═CH—CH 2 —OH, and ═O, are disclosed, and a process for their preparation which selectively introduces 13 C and 14 C carbon labels into a fluoroalkyl chain.
1. A compound having the formula
R f — b CF(U) y (T) z Formula 1A or
R f — b CF 2 b CF(U) y (T) z Formula 1B
wherein
R f is a linear or branched perfluoroalkyl radical Z(C m F 2m )—,
m is 1, 3 to 20, or a mixture thereof;
Z is F when m is 1, and Z is F, Cl, or H when m is 3 to 20, or a mixture thereof;
b is 13 or 14;
y is 1 and z is 0 or 1; and
when y and z are each 1, U is F, and T is selected from the group consisting of monovalent radicals —X wherein X is I or Br, —CH 2 —CH 2 —X, —CH═CH 2 , —CH 2 —CH 2 —OH, —CH 2 —COOH, —CH 2 OH, — b CH 2 OH, —COOH, — b COOH, —O—CF(CF 3 )—C(O)F, —O—CF(CF 3 )—X, —SO 2 Y wherein Y is H, F or Cl, and —SO 3 H; and
when y is 1, and z is 0, U is selected from the group consisting of divalent radicals ═CH—COOH, ═CH—CH 2 —OH, and ═O.
2. A compound of claim 1 wherein m is a positive integer equal to 6, 7, 8 or 9.
3. A compound of claim 1 wherein y and z are each 1; Z and U are each F; and T is I or Br.
4. A compound of claim 1 wherein y and z are each 1; Z and U are each F; and T is CH 2 —CH 2 —X wherein X is I or Br.
5. A compound of claim 1 wherein y and z are each 1; Z and U are each F; and T is b COOH.
6. A compound of claim 5 wherein m is 6 and b is 13.
7. A compound of claim 1 wherein y and z are each 1; Z and U are each F; and T is b CH 2 OH.
8. A compound of claim 1 wherein y and z are each 1; Z and U are each F; and T is —CH═CH 2 .
9. A compound of claim 1 wherein y and z are each 1; Z and U are each F; and T is —CH 2 —CH 2 —OH.
10. A compound of claim 1 wherein y and z are each 1; Z and U are each F; and T is —CH 2 OH.
11. A compound of claim 1 wherein y and z are each 1; Z and U are each F; and T is —O—CF(CF 3 )—C(O)F.
12. A compound of claim 1 wherein y and z are each 1; Z and U are each F; and T is —O—CF(CF 3 )—I.
13. A compound of claim 1 wherein y and z are each 1; Z and U are each F; and T is —SO 3 H or —SO 2 Y wherein Y is H, F or Cl.
14. A compound of claim 1 wherein y is 1, z is 0, and U is ═CH—COOH.
15. A compound of claim 1 wherein y is 1, z is 0, and U is ═CH—CH 2 —OH.
16. A compound of claim 1 wherein y is 1, z is 0, and U is ═O.
17. A process for the preparation of
R f — b CF 2 b CF(U) y (T) z Formula 1B
wherein
R f is a linear or branched perfluoroalkyl radical Z(C m F 2m )—,
m is 1, 3 to 20, or a mixture thereof;
Z is F when m is 1 and Z is selected from F, Cl, or H when m is 3 to 20 or a mixture thereof;
b is 13 or 14;
y and z are each 1;
U is F; and
T is —X wherein X is I or Br,
comprising
a) contacting a perfluoroalkyl metallic compound of formula
(R f ) (v-w) b CF 2 MX w
wherein
R f is a linear or branched perfluoroalkyl radical Z(C m F 2m )—,
M is selected from the group consisting of Zn, Li, Cd, Mg, Ca, and amalgams thereof with Hg,
X is I or Br,
v is the valence of M,
w is 0 or 1, and
b is 13 or 14,
with CO 2 to generate the corresponding acid;
b) contacting the acid from step a) with a fluorinating agent to yield R f — b CF 2 b C(O)F;
c) contacting the R f — b CF 2 b C(O)F with a substituted trifluorooxirane in the presence of a fluoride ion source to yield R f — b CF 2 — b CF 2 —O—CF[(CF 2 ) p R″]—C(O)F wherein R″ is H or F and p is 1 to 8; and
d) contacting R f — b CF 2 — b CF 2 —O—CF[(CF 2 ) p R″]—C(O)F with a metal iodide or metal bromide and heating to yield R f — b CF 2 b CF(U) y (T) z .
18. The process of claim 17 wherein (R f ) (v-w) b CF 2 MX w is prepared by contacting R f — b CF 2 X with a Grignard reagent.
19. The process of claim 17 wherein the fluorinating agent is selected from the group consisting of N,N-diethylaminosulfur trifluoride, [bis(2-methoxyethyl)aminosulfur trifluoride], sulfur tetrafluoride, dialkylaminotrifluorosulfurane, cyclohexylaminotrifluorosulfurane, cyclopentylaminotrifluorosulfurane, alkylphenylaminotrifluorosulfurane, and morpholinotrifluorosulfurane.
20. The process of claim 17 further comprising contacting the acid from step a) with a halogenating agent to yield an acid halide prior to contacting with the fluorinating agent.
21. The process of claim 19 wherein the fluorinating agent is selected from the group consisting of KF, NaF, SbF 3 , N,N-diethylaminosulfur trifluoride, [bis(2-methoxyethyl)aminosulfur trifluoride], sulfur tetrafluoride, dialkylaminotrifluorosulfurane, cyclohexylaminotrifluorosulfurane, cyclopentylaminotrifluorosulfurane, alkylphenylaminotrifluorosulfurane, and morpholinotrifluorosulfurane.
22. The process of claim 17 wherein the substituted trifluorooxirane is hexafluoropropylene oxide.
23. The process of claim 17 wherein the fluoride ion source is KF or CsF.
24. The process of claim 17 wherein metal iodide is lithium iodide.
25. A process for the preparation of a compound of formula
R f — b CF 2 — b COOH
wherein R f is a linear or branched perfluoroalkyl radical Z(C m F 2m )—, Z is F, and m is 3 to 20 or a mixture thereof, comprising contacting R f — b CF 2 X wherein R f is as defined above and X is Br or I with an organometallic compound R—Mg—X or R—Li wherein R is a C 1 -C 4 alkyl and X is Br or I, and b CO 2 to generate R f — b CH 2 — b COOH b is 13 or 14.