0 gms of neopentyl glycol 1 4 mls of methyl iodide and 0 3 gms of ruthenium chloride were added to a glass liner for a rocking autoclave the liner was stoppered and pressurized to about 2 000 psi with carbon monoxide after heating for about 15 hours at 190 u00b0 c a polyether polyester having a molecular weight of 578 was obtained in 60 yield the reaction product was purified according to the process described in example 1 the procedure of example 8 was followed except that a hydrogen iodide promoter and ruthenium oxide catalyst were used and the reaction process was cooled after only four hours a polyether polyester having a molecular weight of 587 was obtained in 36 yield the procedure of example 8 was repeated except that the methyl iodide promoter was present in about 50 mole percent rather than 10 mole percent as with the other example herein the obtained yield of product was 65 which was a polyether polyester glycol having a molecular weight of 1 154 the procedure followed was the same as that described for example 1 except that the polyether polyester glycol was prepared from cyclohexane dimethanol 1 4 di hydroxymethyl cyclohexane using ruthenium chloride as the metal containing catalyst the reaction mixture was cooled after three hours of heating to obtain a 43 yield of a polyether polyester glycol having a molecular weight of 372 hydroxyl number method the procedure used was the same as that described for example 1 except that the polyether polyester was prepared from neopentyl glycol using a rhodium oxide catalyst and heating for a total.