Isoln from shark liver oils: Heilbron, Owens, J. Chem. Soc. 1928, 942; Davies et al., ibid. 1933, 165; Nakamiya, C.A. 33, 8175 (1939); from yellow bone marrow: Holmes et al., J. Am. Chem. Soc. 63, 2607 (1941); from coral-reef-building animals: Kind, Bergmann, J. Org. Chem. 7, 424 (1942). Synthesis from allyl octadecyl ether: Davies et al., J. Chem. Soc. 1930, 2542: Kornblum, Holmes, J. Am. Chem. Soc. 64, 3045 (1942). Synthesis of optically active batyl alc: Baer, Fischer, J. Biol. Chem. 140, 397 (1941).