
DIMETHYL OCTADECANEDIOATE synthesis
- Product Name:DIMETHYL OCTADECANEDIOATE
- CAS Number:1472-93-1
- Molecular formula:C20H38O4
- Molecular Weight:342.51
Yield: 99%
Reaction Conditions:
with sulfuric acid for 16 h;Reflux;
Steps:
2.8.1 Octadecane-1,18-dimethylester (C18diCOOMe)
In a 1000mL flask C18diCOOH (20.5g, 63.7mmol, 1.0eq.) was added to 600mL of MeOH. After the addition of sulfuric acid (10 drops) the mixture was stirred for 16h under reflux. The C18diCOOH dissolved upon heating. The reaction mixture was allowed to reach room temperature (rt). The product crystallized as a colorless solid and was filtered and washed with cold MeOH. The colorless solid was purified by flash column chromatography (hexane:ethyl acetate=9:1) to receive 21.7g of C18diCOOMe (99%) as colorless powder. (0015) 1H NMR (400MHz, CDCl3, TMS): δ (ppm)=3.65 (s, 6H,-O-CH3), 2.29 (t, 4H, J=7.56Hz,-CO-CH2-CH2-), 1.60 (m, 4H,-CH2-CH2-CH2-), 1.37-1.20 (m, 24H,-CH2-(CH2)12-CH2-). (0016) 13C NMR (100MHz, CDCl3, TMS): δ (ppm)=174.3 (-CH2-CO-O-CH3), 51.4 (-O-CH3), 34.1 (-CH2-CO-), 29.6-29.2 (-CH2-(CH2)12-CH2-), 29.1 (-CH2-(CH2)2-CO-), 24.9 (-CH2-CH2-CO-). (0017) IR (cm-1): 3451, 2916, 2847, 1738, 1472, 1463, 1435, 1412, 1382, 1370, 1350, 1316, 1273, 1233, 1191, 1163, 1117, 1091, 1033, 991, 968, 882, 824, 769, 732, 719, 700. (0018) MS (EI): m/z (%) calculated for C20H38O4Na: 365.2668; found: 365.2674.
References:
Fleige, Emanuel;Achazi, Katharina;Schaletzki, Karolina;Triemer, Therese;Haag, Rainer [Journal of Controlled Release,2014,vol. 185,# 1,p. 99 - 108]

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