Reactions of N,N^′-bis(2-hydroxyethyl)oxalamide with Ethylene Carbonate and Use of the Obtained Products as Components of Polyurethanes Foams

Table 1

Reaction conditions of BHEOA with EC.

Run	Initial Molar Ratio	Amount of K2CO3 (mole K2CO3/mole OA)	Temp. (∘C)	Time of Reaction (h)	Molar Ratio BHEOA  : x in PostReaction Mixture (from Mass Balance)
1.	1 : 2	0.03	120	25^∗	—
2.	1 : 2	0.06	140	5	1 : 1.87
3.	1 : 2	0.06^∗∗	140	11	1 : 1.74
4.	1 : 2	0.06	160	2	1 : 1.82
5.	1 : 4	0.06	140	10	1 : 3.76
6.	1 : 6	0.06	140	14	1 : 5.61
7.	1 : 6	0.06	160	5	1 : 5.45
8.	1 : 10	0.09	140	24.5	1 : 9.07
9.	1 : 10	0.09	160	8	1 : 9.14

x: oxyethylene unit, ^∗same EC was unreacted, ^∗∗DABCO was used as catalyst.