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Purification of Laboratory Chemicals, 8th Edition by W.L.F. Armarego

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1,2-Dilauroyl-sn-glycero-3-phosphoethanolamine (±-dilauroyl-α-cephalin, 3-sn-phosphat-idylethanol-amine 1,2-didodecanoyl) [59752-57-7] C29H58NO8P, M 579.8, m 210°, pKEst(1)~ 5.8 (PO4H), pKEst(2)~ 10.5 (NH2). Recrystallise it from EtOH or tetrahydrofuran. Dry it in a vacuum and store it at -20°. [Bevan & Malkin J Chem Soc 2667 1951, DOI: 10.1039/JR9510002667; IR: Bellamy & Beecher J Chem Soc 728 1953, DOI: 10.1039/JR9530000728; Beilstein 4 IV 1417.]

3,7-Dimethyl-2,6-dioxopurine (Theobromine ) [83-67-0] C7H8N4O2, M 180.2, m 337° (sublimes slowly at 290° and finally melts at ~ 351°), pK140 -0.16, pK125 9.96. Recrystallise it from hot H2O (solubility in w/v% is 0.06 at 15°; 1.25 at 100°). Forms salts with heavy metals, is a diuretic, vasodilator ...

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