This aliphatic terpene is isomeric with myrcene. It differs from the latter, presumably, in the position of the double bonds. It was discovered by van Romburgh in the oil of Ocimum Basili-cum. Possibly it is also contained in esdragon oil. B. p. 73 to 74° (21 mm); d22o 0,794; d15. 0,801; nD 1,4861.

The dihydro-ocimene, which results upon reduction with sodium and alcohol, is identical with dihydromyrcene.

Upon hydration, according to Bertram's method,3) Enklaar obtained ocimenol [b. p. 97° (10 mm); d15o 0,901; nD15o 1,4900], which yields a phenylurethane melting at 72°.

Upon heating, ocimene yields allo-ocimene, which possibly is stereoisomeric with ocimene. The physical constants are somewhat higher than those of ocimene: b. p. 81° (12 mm), d15o 0,8182, nD 1,5296.

Additional aliphatic terpenes have been found in hop oil,4)

1) Bed. Berichte 34 (1901), 3126.

2) Compt. rend. 132 (1901), 1048; Bull. Soc. chim. III. 25 (1901), 687.

3) D.R.P. 67255.

4) Chapman, Journ. chem. Soc. 67 (1895), 54.

in the oil of Indian hemp (Cannabis indica)1), in the oil of sassafras leaves,2) in rosemary oil3), and in the origanum oil of Smyrna.4) Mention should also be made of the occurrence of an ole-finic sesquiterpene C15H245) in oil of citronella. Its constants are: b. p. 270 to 280° (atmospheric pressure), 157° (15 mm); d15o0,8643; aD15o + 1°28'; nD15o1,51849.