"ORGANIC CHEMICALS: E" ?-ECDYSON

[3604-87-3] M 464.7, m 239-242 , 242 , [ ?] ²⁰ _D (c 1, EtOH). Recrystd from tetrahydrofuran-pet ether, and from H ₂O as a hydrate. It has been purified by chromatography on Al ₂O ₃ and elution with EtOAc-MeOH. It has ?max at 242nm ( ? 12.400). Its acetate has m 214-216 from EtOAc-pet ether, and the 2,4-dinitrophenylhydrazone has m 170-175 (dec) from EtOAc. [Karlson and Hoffmeister Justus Liebigs Ann Chem 662 1 1963; Karlson Pure Appl Chem 14 75 1967].

?-Ecdyson ( ?-echdyrosetrone [5289-74-7] M 480.7, m 245-247 , [ ?] ²⁰ _D +66 (c 1, MeOH). Crystd from water or tetrahydrofuran/pet ether.

Echinenone [432-68-8] M 550.8, m 178-179 , A ^* _{1 cm} ( ?max) 2160 (458nm) in pet ether. Purified by chromatography on partially deactivated alumina or magnesia, or by using a thin layer of silica gel G with 4:1 cyclohexan/diethyl ether as the developing solvent. Stored in the dark at -20 .

Eicosane [112-95-8] M 282.6, m 36-37 , b 205 /15mm, d 36.7 0.7779, n ⁴⁰ 1.43453. Crystd from EtOH.

Elaidic ( trans-oleic) acid [112-79-8] M 282.5, m 44.5 , pK ²⁵ 4.9. Crystd from acetic acid, then EtOH.

Ellagic acid (2H ₂O) [476-66-4] M 338.2, m >360 , pK _Est(1) 8, pK _Est(2) 11. Crystd from pyridine.

Elymoclavine (8,9-didehydro-6-methylergoline-8-methanol) [548-43-6] M 254.3, m 249-253 (dec)