Process for the preparation of polyether polyols

A compound corresponding to the formula (XI)

• (RFSO3)2M(ERE′I) (XI)
• wherein:
• RF:
• represents a perfluoroalkyl or perfluoroaryl group;
• M:
• represents a metal from Group 13 of the Periodic Table of the Elements;
• E:
• represents oxygen, sulfur, selenium, NR1 or PR1,
• wherein:
• R1:
• represents a hydrogen atom or a C1-C20 hydrocarbon radical which may be alkyl or aryl, wherein R1 can form a ring with R;
• R:
• represents a C1-C30 hydrocarbon bridge which may be an alkylene, arylene or aralkylene bridge;
• E′:
• represents a hydrogen atom, a C1-C20 hydrocarbon radical which may be alkyl or aryl, OR2, NR2R3, halogen, SR2 or PR2R3,
• wherein:
• R2 and R3:
• may be the same or different and each represents a hydrogen atom, or a C1-C20 hydrocarbon radical which may be alkyl, aryl or aralkyl, wherein R2 can form a ring with R3 or R and/or R3 can form a ring with R or R2, and
• I:
• represents an integer from 1 to 10.