Cyclic (poly)glycerol sulphates and preparation and use thereof
View Patent ↗The present invention relates to novel cyclic sulphates of (poly)glycerol, particularly to the novel compound of 4-(hydroxymethyl)-1,3,2-dioxathiolane-2,2-dioxide. The present invention also relates to the preparation process of the cyclic sulphate compounds, and to the use thereof as an intermediate to prepare green surfactants containing sulphate groups.
1. A cyclic (poly)glycerol sulphate compound of formula (I):
wherein n is an integer from 0 to 20; and each —C 3 H 6 O 2 — is independently a glycerol residual.
2. The compound according to claim 1 , wherein n is 0-10.
3. The compound according to claim 1 , wherein n is 0-4.
4. The compound according to claim 1 , wherein each —C 3 H 6 O 2 — is independently
5. The compound according to claim 1 , wherein n is 0 and the compound of formula (I) is the compound of the following formula (I′)
6. A solution of a compound of formula (I) as defined in claim 1 in THF.
7. The solution according to claim 6 , wherein said compound is the compound of formula (I′)
8. A method, comprising: using a compound according to claim 1 as an intermediate in the preparation of a surfactant containing sulphate moiety.
9. A process for preparing a compound according to claim 1 , comprising the step of reacting a compound of formula (II) with an oxidant
wherein n and —C 3 H 6 O 2 — are as defined in claim 1 .
10. The process according to claim 9 , wherein n is 0 and the compound of formula (II) is the compound of the following formula (II′)
11. The process according to claim 9 , wherein the oxidant is selected from the group consisting of KMnO4/H3O + , RuO4, RuO2/NaIO4, RuCl3.3H2O/NaIO4, Ca(MnO4)2 and Ba(MnO4)2.
12. The process according to claim 9 , wherein the oxidant is a ruthenium-based oxidant system comprising a catalytic amount of a ruthenium compound and a second agent that oxidizes the ruthenium compound to complete the catalyst cycle.
13. The process according to claim 12 , further comprising reacting said ruthenium compound with the second agent, wherein the ruthenium compound is selected from the group consisting of RuO2, RuCl3 and hydrates thereof and a mixture thereof.
14. The process according to claim 12 , wherein said second agent is selected from the group consisting of periodate, permanganate, hypochlorite, bromate, peracetic acid, periodic acid, oxygen, cerium sulfate, electrochemically generated chlorine, and monoperoxysulfate.
15. The process according to claim 14 , wherein the periodate, the permanganate and the hypochlorite are selected from the group of NaIO4, KMnO4, NaClO and a mixture thereof.
16. The process according to claim 12 , wherein said ruthenium compound and said second agent are used in the molar ratio of about 1:50-1:300.
17. The process according to claim 12 , wherein the molar ratio of the cyclic sulfite of formula (II) and the ruthenium compound is about 1:0.0001 to 1:0.01.
18. The process according to claim 9 , wherein the reaction carried out in a solvent system that is polar or non-polar.
19. The process according to claim 18 , wherein said solvent system is a mixture of water and acetonitrile.
20. The process according to claim 9 , wherein the reaction is carried out under the temperature between about 0° C. to about 100° C.