THE OLEORES1N OF P1NUS 1NSULARIS ENDL. 



By Benjamin T. Bkooks. 

 (From the Chemical Laboratory, Bureau of Science, Manila, P. I. 



The preparation of turpentine and rosin, or colophony, from the resin 

 of Pimts insularis Endl. is apparently a commercial possibility. It was 

 therefore investigated in order to ascertain if the products compare favor- 

 ably with the turpentine and naval stores manufactured in the southern 

 United States. 



To judge from the work so far as it is finished, the oleoresin is identical 

 with that collected in America. The volatile oil consists for the greater 

 part of ordinary pinene and the resin of over 90 per cent abietic acid. 



The constants of the oil as determined by Mr. George F. Kichmond of 



OAO T)° 



this laboratory are as follows: 1 Specific gravity, ^^=0.8593; N-^-= 



30° 

 1.4656; A-pj-=-)-26.5. Ninety-six per cent of the oil distilled between 



154° and 165°.5. 



I have determined the optical rotations of five specimens of the tur- 

 pentine which were distilled with steam from five samples of the oleo- 

 resin collected from as many different trees. Considerable variation in 

 these values was found, but the differences were not as large as those 

 noted in the case of American turpentine by Herty. 2 The values I 

 obtained at 30°, using a Schmidt and Haensch half-shadow polariscope, 

 sodium flame, range from +13.15° to +27.48°. These numbers are 

 sufficient to show that the optical rotation of the turpentine from this 

 species, like that obtained from Pinus palustris Mill, and Pinus lietero- 

 phylla (Ell.) Sudworth in America and the commercial turpentine of 

 France and Eussia, has no characteristic value. 



Although the constants identify the oil as consisting principally of 

 ordinary pinene, several derivatives of the latter were prepared for 

 further proof. 



From a fraction boiling from 155° to 156° pinene nitrosyl chloride was 

 prepared; it was identified microscopically, by its melting point (115°) and by 



1 This Journal, Sec. A (1909), 4, 232. 

 *Journ. Am. Chem. Soc. (1908), 30, 863. 



229 



