Catalysts for polyesterol synthesis

2:

• The process of claim 1, wherein R1 is —(CH2)x-COOH, wherein x is 0, 1, 2 or 3;
• and R2 is —(CH2)y-COOH, wherein y is 0, 1, 2 or 3.

3:

• The process of claim 1, wherein R1 is Ar1 and R2 is Ar2.

4:

• The process of claim 1, wherein x and y are 1.

5:

• The process of claim 1, wherein R1 and R2 are unsubstituted phenyl.

6:

• The process of claim 1, which comprises catalyzing, with the compound of formula I, a reaction of at least one di-carboxylic acid with at least one diol or polyol.

7:

• The process of claim 6, wherein an amount of the compound of formula I in a reaction mixture is between 1 to 104 ppm.

8:

• The process of claim 6, wherein an amount of the compound of formula I in a reaction mixture is between 1 to 103 ppm.

9:

• The process of claim 6, wherein the at least one di-carboxylic acid is selected from the group consisting of malonic acid, succinic acid, glutaric acid, adipic acid and pimelic acid.

10:

• The process of claim 6, wherein the at least one diol is selected from the group consisting of monoethylene glycol, diethylene glycol, propane diol, 1,4-butane diol, and trimethylol propane (TMP).

11:

• The process of claim 6, wherein the reaction is performed at a temperature between 80° and 300° C.

12:

• A process of producing a polyurethane, the process comprising reacting a polyesterol obtainable from the process of claim 6.