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Klenk1 isolated from cattle and human brains a cerebroside which upon hydrolysis gave galactose, sphingosin and an unsaturated acid melting at 41°. He established its formula as C24H46O2 and its exact constitution as tetracosene-13-oic acid (I) by oxidizing it to pelargonic acid and tridecamethylene dicarboxylic acid. Moreover, on catalytic reduction it yielded a saturated acid melting at 85°identical with lignoceric acid from beechwood tar and with «-tetracosanic acid synthesized from behenic acid. He also reported that by melting over nitric acid, a new isomeric acid melting at 61°was obtained. Nervonic acid was shown to be identical with selachaleic acid isolated from whale oil.2It is obvious that nervonic acid is probably the cis form of erucylacetic acid. By synthesis this has been shown to be the case. Ethyl erucate was reduced to erucyl alcohol (II) which was converted to the bromide and this in turn carried through a malonic ester synthesis to erucylacetic acid (III):CHíCCHOtCH-CHCCHs),!-CHr-OH -> CH3(CH2)7CH=CH(CH2)"-CH2-CH(COOC2H5)2 -> II CH3(CH2)7CH=CH(CH2)h-CH2CH2COOH III

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