Family: Urticaceae.

Origin. The oil distilled in the island of Reunion from an unknown species of Pilea (family Urticaceae) was first described by Schimmel & Co.1).

Properties. Two samples of the oil, which is water-white to greenish and very limpid, have been examined. The oil has a terpene-like and not unpleasant odor. d15o 0,8533 and 0,8520; aD + 33°53' and +58°20'; nD20o 1,46862 and 1,46902; E. V. 5,1 and 7,7; E. V. after acetylation 24,2 and 34,4; soluble in about 5 vol. of 90 p. c. alcohol, the solution being slightly turbid. When distilled under 748 mm. air pressure the following fractions were obtained: 1) 158 to 159° 6 p. c; 2) 159 to 160° 35 p.c; 3) 160 to 161° 10 p.c; 4) 161 to 161,5° 10 p.c; 5) 161,5 to 163° 10 p.c; 6) 163 to 165° 10 p.c; 7) 165 to 168° 7 p.c; 8) 168 to 174° 2 p.c; 9) 174 to 194° 8 p.c. Residue (yellow, decomposed) 2 p.c.

Composition. The oil contains a-pinene and sabinene. Fraction 157 to 158° (d15o0,8545; aD + 14°35'; nD20o 1,46684) was used in the preparation of the nitrosochloride, which, when reacted upon with benzylamine, yielded pinene nitrolbenzylamine melting at 122°2).

In fraction 167 to 168° Semmler3) found sabinene (d20o0,8402; aD +61°20; nD 1,46954), which was identified by oxidation with potassium permanganate to sabinene glycol (b. p. 150 to 154° under 9 mm. pressure; d20o 1,0332; nD 1,48519; mol. refr. found 47,17, computed for C10H18O2 46,97).

1) Report of Schimmel & Co. October 1906, 83 and April 1907, 105. 2) Report of Schimmel & Co. loc. cit. 3) Berl. Berichte 40 (1907), 2963.