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to act on pinene in the presence of water; they obtained, in addition 
to cymol, also the crystallised pinene dibromide whose melting point 
was found at 167° to 168"^. 
A. Denaro and G.Scarlata^) allowed monochloracetone and d-pinene 
to act on aluminium chloride whilst cooling in ice, and thereby ob- 
tained, as in the case when acetone acted on d-pinene in the presence 
of aluminium chloride, a colourless oil of the composition C-^^H^qO, 
and the boiling point 290°. When iodine acts on d-pinene, there is 
formed the iodine derivative 0^0-^14^4' which when heated with sodium 
ethylate in a water bath, yields a tri-iodethoxy pinene (C^o H^^Ig OCg H5). 
By reduction it is converted into a mono- and a much more unstable 
di-iodethoxy pinene C^qH^4IOC2H5 and C|()Hj4l2 OCg H5. 
For the purpose of producing terpinol^), the authors recommend 
to allow a solution of 20 parts zinc chloride in 10 parts water to act 
on 100 parts terpin hydrate, and to distil with steam. By the action 
of two molecules hydriodic acid on terpin hydrate and treatment with 
caustic potash they obtained terpinylic acid, whilst monochloracetone 
yielded cajeputol (eucalyptol), boiling point 174°, in addition to terpinol 
(b. p. 168°). 
By the reaction of chromyl chloride on pinene in a solution of 
carbon disulphide, Henderson, Gray and Smith 3) obtained in ad- 
dition to resinous products, a volatile oil, in which were detected a 
saturated aldehyde CqH^^'CHO an unsaturated ketone Cg 11^4:00, 
and small quantities of a chlorinated body. The aldehyde melted at 
32° to 33^, boiled at 205° to 207^, at 755 mm pressure, and was 
readily converted on oxidation with dilute nitric acid or an aqueous 
solution of permanganate into an acid C9H^5«COOH of the melting 
point 117°, which was difficultly soluble in water, readily in alcohol, 
and slightly volatile with steam. The ketone was oily, and boiled 
at 206° to 207°, at 774 mm pressure; it yielded an oily oxime, and a 
semicarbazone melting at 226° to 228° with decomposition. With 
sodium hypobromite, bromoform and p-toluylic acid were obtained. 
Camphene. Zelinski and Alexandroff ^) had obtained from 
Russian oil of turpentine, by repeated treatment of the first runnings 
with solution of permanganate, a Isevo-pinene of high rotatory power, 
[a]j) = — 70^45', which strange to say yielded no nitroso-chloride. 
^) Preliminary communication. Gazz. chim. ital. 33 I. (1903), 393. Rep. 
Chem. Centralbl. 1903, 11. 571. 
^) The compound "terpinol" does not exist. (Wallach, Liebig's Annalen 
230 (1885), 271). It was found to be a mixture of terpineol and terpenes. 
^) Proc. chem. Soc. 19 (1903), 195. 
^) Chem. Ztg. 26 (1902), 1224. 
