The present invention concerns a method for producing for producing and purifying 2,3,3,3-tetrafluoro-1-propene (1234yf) from a first composition comprising 2,3,3,3-tetrafluoro-1-propene and chloromethane (40), said method comprising the steps of: (a) bringing said first composition into contact with at least one organic extractant in order to form a second composition; (b) extractive distillation of said second composition in order to form (i) a third composition comprising said organic extractant and chloromethane (40); and (ii) a stream comprising 2,3,3,3-tetrafluoro-1-propene (1234yf); (c) recovering and separating said third composition, preferably by distillation, in order to form a stream comprising said organic extractant and a stream comprising chloromethane (40).

The present invention is directed to a method of making an amine functionalized elastomer, comprising the steps of polymerizing at least one first monomer selected from the group consisting of 1,3-butadiene and isoprene and a second monomer of formula I in the presence of a polymerization catalyst in a hydrocarbon solvent to form a first copolymer in solution;

##STR00001##

where R.sup.1 is phenylene, a linear or branched alkane diyl group containing from 1 to 10 carbon atoms, or a combination of one or more phenylene groups and one or more linear or branched alkane diyl groups containing from 1 to 10 carbon atoms; and R.sup.2 is methyl or ethyl; and mixing the first copolymer in solution with a protic solvent followed by stirring to convert the first copolymer to a second copolymer given by the formula poly(M1 co M2) wherein M1 is the first monomer and M2 is of formula II

##STR00002##

where R.sup.1 is as previously defined.

The present invention concerns a method for producing for producing and purifying 2,3,3,3-tetrafluoro-1-propene (1234yf) from a first composition comprising 2,3,3,3-tetrafluoro-1-propene and chloromethane (40), said method comprising the steps of: (a) bringing said first composition into contact with at least one organic extractant in order to form a second composition; (b) extractive distillation of said second composition in order to form (i) a third composition comprising said organic extractant and chloromethane (40); and (ii) a stream comprising 2,3,3,3-tetrafluoro-1-propene (1234yf); (c) recovering and separating said third composition, preferably by distillation, in order to form a stream comprising said organic extractant and a stream comprising chloromethane (40).

Disclosed herein is a salt of formula L:

##STR00001##

wherein q is + or ; p is 2+, +, or 2; g is 1 or 2; G is selected from R.sup.5CCCO.sub.2.sup., R.sup.5CCC(O)S.sup., R.sup.5CCCS.sub.2.sup., R.sup.5CCSO.sub.2.sup., R.sup.5CCS(O)S.sup., R.sup.5CCSO.sub.3.sup., R.sup.5CCS(O).sub.2S.sup., and a diallylammonium group, wherein R.sup.5 is independently selected from H, linear or branched C.sub.1-6 alkyl; L is straight-chain C.sub.1-15 alkyl, wherein one or more CH.sub.2 groups are independently replaced by (CH.sub.2OCH.sub.2), (CH.sub.2CH.sub.2O), (OCH.sub.2CH.sub.2) CO, O, S, NH or NR.sup.1, wherein R.sup.1 is linear or branched C.sub.1-6 alkyl; A is selected from NR.sup.2.sub.3.sup.+, CO.sub.2.sup., C(O)S.sup., CS.sub.2.sup., SO.sub.2.sup., S(O)S.sup., SO.sub.3.sup. and S(O).sub.2S.sup., wherein R.sup.2 is, for each occurrence independently, selected from H, linear or branched C.sub.1-6 alkyl; E is selected from NR.sup.3.sub.2, NR.sup.3.sub.3.sup.+, CO.sub.2H, C(O)SH, CS.sub.2H, SO.sub.2H, S(O)SH, SO.sub.3H, S(O).sub.2SH, CO.sub.2.sup., C(O)S.sup., CS.sub.2.sup., SO.sub.2.sup., S(O)S.sup., SO.sub.3.sup., S(O).sub.2S.sup., wherein, for each occurrence independently, R.sup.3 is selected from H, linear or branched C.sub.1-6 alkyl; with the proviso that the overall charge of A and E is not 0 and with the proviso that the salt of formula I is overall neutral in charge. Further disclosed are cosmetic preparations comprising salts of formula I as well as uses of such salts or preparations as hair care products.

Disclosed herein is a salt of formula L:

##STR00001##

wherein q is + or ; p is 2+, +, or 2; g is 1 or 2; G is selected from R.sup.5CCCO.sub.2.sup., R.sup.5CCC(O)S.sup., R.sup.5CCCS.sub.2.sup., R.sup.5CCSO.sub.2.sup., R.sup.5CCS(O)S.sup., R.sup.5CCSO.sub.3.sup., R.sup.5CCS(O).sub.2S.sup., and a diallylammonium group, wherein R.sup.5 is independently selected from H, linear or branched C.sub.1-6 alkyl; L is straight-chain C.sub.1-15 alkyl, wherein one or more CH.sub.2 groups are independently replaced by (CH.sub.2OCH.sub.2), (CH.sub.2CH.sub.2O), (OCH.sub.2CH.sub.2) CO, O, S, NH or NR.sup.1, wherein R.sup.1 is linear or branched C.sub.1-6 alkyl; A is selected from NR.sup.2.sub.3.sup.+, CO.sub.2.sup., C(O)S.sup., CS.sub.2.sup., SO.sub.2.sup., S(O)S.sup., SO.sub.3.sup. and S(O).sub.2S.sup., wherein R.sup.2 is, for each occurrence independently, selected from H, linear or branched C.sub.1-6 alkyl; E is selected from NR.sup.3.sub.2, NR.sup.3.sub.3.sup.+, CO.sub.2H, C(O)SH, CS.sub.2H, SO.sub.2H, S(O)SH, SO.sub.3H, S(O).sub.2SH, CO.sub.2.sup., C(O)S.sup., CS.sub.2.sup., SO.sub.2.sup., S(O)S.sup., SO.sub.3.sup., S(O).sub.2S.sup., wherein, for each occurrence independently, R.sup.3 is selected from H, linear or branched C.sub.1-6 alkyl; with the proviso that the overall charge of A and E is not 0 and with the proviso that the salt of formula I is overall neutral in charge. Further disclosed are cosmetic preparations comprising salts of formula I as well as uses of such salts or preparations as hair care products.