| abstract |
The present invention relates to a method for preparing polyols of formula (I″) n n n n n n n n n n R′ 1 being H or an alkyl group, R″ being especially an alkyl group, A 1 , being an alkylene radical and R 3 , are being especially a group -A 2 -O—Y′, A 2 being an alkylene radical and Y′ being especially H, n said method especially comprising a step of epoxidation of a compound of formula n n n n n n n n n n R″ 1 being H or an alkyl group, A 1 being defined as above in formula (I″) and R 4 being especially a group -A 2 -O—Y 1 ′, A 2 being defined as above in formula (I″) and Y′ 1 being especially H, n in order to obtain a compound of formula n n n n n n n n n n A 1 being defined as above, R′″ 1 being H or an alkyl group and R 5 being especially a group of formula -A 2 -O—Y 2 ′, A 2 being as defined above in formula (I″) and Y′ 2 being especially H, |