Process for the preparation of fluoropolyoxyalkylenes having one end group -CH2OH and the other end group containing chlorine
US6573411B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 2002 |
| Grant date | Jun 3, 2003 |
| Priority date | — |
| Expiry date | May 16, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C41/48
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process to obtain fluoropolyoxyalkylenes having the structure:T—O—(CF2CF(CF3)O)n−1—(CF(CF3)O)m—CF2—CH2OH  (I)wherein:T=C1-C3 perfluoroalkyl containing one Cl atom;n=an integer from 1 to 15; m/n=0-0.5, m+n such to have a number molecular weight in the range 280-4,000;said process comprising:a) the gradual addition of a metal hydride in admixture with a solvent to an ester precursor having the structureT—O—(CF2CF(CF3)O)n−1—(CF(CF3)O)m—CF2—COOR  (II) wherein R=C1-C20 alkyl, or aromatic, cycloalkyl or heterocyclic residue,b) the hydrolysis of the reaction mixture obtained in step a) with an aqueous acid solution, the subsequent separation from the obtained organic phase of the compounds of structure (I).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.