Diethylene Glycol Monomethyl Ether → Ethyl 2,5,8,11,14,17,20,23-octaoxanonacosan-29-oate

Temperature

0 °C

NaH (88 mg of a 60% dispersion in oil, 2.2 mmol) was suspended in anhydrous toluene (3 ml) under N2 and chilled to 0° C. Non-polydispersed diethylene glycol monomethyl ether (0.26 ml, 0.26 g, 2.2 mmol) that had been dried via azeotropic distillation with toluene was added. The reaction mixture was allowed to warm to room temperature and stirred for four hours, during which time the cloudy grey suspension became clear and yellow and then turned brown. Mesylate 20 (0.50 g, 1.0 mmol) in 2.5 ml dry toluene was added. After stirring at room temperature over night, the reaction was quenched by the addition of 2 ml of methanol and the resultant solution was filtered through silica gel. The filtrate was concentrated in vacuo and the FAB MS: m/e 499 (M+H), 521 (M+Na). Additional purification by preparatory chromatography (silica gel, 19/3 chloroform/methanol) provided the non-polydispersed product as a clear yellow oil (0.302 g 57%). FAB MS: m/e 527 (M+H), 549 (M+Na).

1. additionwas added
2. temperatureto warm to room temperature
3. stirringAfter stirring at room temperature over night
4. customthe reaction was quenched by the addition of 2 ml of methanol
5. filtrationthe resultant solution was filtered through silica gel
6. concentrationThe filtrate was concentrated in vacuo
7. customAdditional purification by preparatory chromatography (silica gel, 19/3 chloroform/methanol)

ORD record

ord-dd254f3cb7854e2ea9bea3f6e077f602

Source dataset

uspto-grants-2004_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06713452B2