Process for the synthesis of (per)fluoropolyether amines

A PFPE amine complying with formula (IV-A1) or (IV-B1):

• G*—O—Rf-L* (IV-A1)
• wherein:
• G* is a group of formula (G*-1):
• —CFX*—CH2—O—(CHY*CHY*O)n*—N(R*1)2 (G*-1)
• in which:
• X* is F or CF3;
• each Y* are both hydrogen or one is hydrogen and the other one is methyl;
• n* is a positive number and R*1 is hydrogen;
• a C1-C20 straight or branched alkyl chain, said alkyl chains optionally comprising one or more mono- or polycyclic hydrocarbon moieties, heteroatoms other than nitrogen, or functional groups other than amine groups;
• or an aromatic mono- or polycyclic hydrocarbon moiety comprising from 4 to 12 carbon atoms, said mono- or polycyclic hydrocarbon moiety optionally comprising heteroatoms or functional groups;
• Rf is a is a fully or partially fluorinated polyether chain;
• L* is the same as G*-1 or is a (per)haloalkyl group
• G′*—O—Rf-L′* (IV-B1)
• wherein:
• G′* is a group of formula (G′*-1)
• —CFX* —CH2—O—(CHY*CHY*O)n*—N(R2*)—[R3*—N(R4*)]2*-R5*—N(R6*)2 (G′*-1)
• in which X*, Y*, n* are the same as in formula (IV-A1);
• R2*, R4* and R6*, equal to or different from one another, are independently selected from hydrogen, alkyl chains and mono- or polycyclic hydrocarbon moieties as defined above in formula (IV-A1);
• R3* and R5*, equal to or different from one another, are straight or branched alkylene chains or aromatic mono- or polycyclic hydrocarbon moieties as defined above in formula (IV-A1) and z* is 0 or an integer equal to or higher than 1;
• Rf is a fully or partially fluorinated polyether chain;
• L′* is the same as G′*-1 or is a (per)haloalkyl group.