820 REPORT—1899. 
cymehe. Its relation to carvone shows the position of the divalent unions, 
corresponding to the formula, 
CH — CH, 
C,H, CZ cH: CH,? 
Nor en 
Diperitene, cinene, ©,)H,,; inactive limonene: 
Sesquiterpenes are widely distributed in the essential oils. The sub- 
stances with high boiling point 274°-275° in oils of cubebs, patchouli, 
galbanum, and sabine oil are of this class. 
Camphor. 
Japanese camphor, O,),,0, is a ketonic derivative of borneol, 
C,,H,,0, which is a hydroxy-tetrahydro-cymene. Their constitutional 
formule were eae oo thus : 
wera’ CH, : CH(OH) 
on, -cHL  So-cH, 0,1, -cHZ Yc :cH, 
ia) a Non ey Gens dit. SOBs ae? ae 
(J apanese Camphor.) (Borneol.) 
Bredt gives the following for camphor :—? 
/ CH,"CO\, 
CH—C(CH;),—C °CH, 
\ CH, CH, / 
Consequently, the formula for borneol should be written thus :— 
/ CH,'CH(OH)\. 
OH—G(CH;), C:CH, 
OH OE, 
So far as we know at present, there is nothing in the absorption 
spectra of camphene and camphor which gives support to the one formula 
rather than to the other. 
Cineol and terpineol are isomers of borneol. The former is a con- 
stituent of oils of cajeput and eucalyptus. It boils at 176°. 
Menthol, or peppermint camphor, is a hydroxy-hexa-hydro-cymene. 
It can be crystallised from oil of peppermint after careful distillation. 
C,,H,,.OH. It yields a hydrocarbon menthene, C,)H,,. Myristicol, 
C,)H,,O, is the camphor from oil of nutmeg. 
Patchouli camphor, from oil of patchouli, C,;H.,0, is a sesqui-camphor. 
Phenols in Essential Oils. 
Thymol and carvacrol are both methyl-iso-propyl phencls, and are 
derivatives of ordinary fn cymene containing the iso-propy] group.° 
/CH; (1) /CH; (1) 
C;H;—C3H, (4) C,H;—C3H, (4) 
NOH (3) NOH (2) 
(Thymol.) (Carvacrol.) 
1 Goldschmidt, Berichte der deutsch. Chem. Ges. vol. xviii. p. 1733. 
2 Berichte der deutsch. Chem. Ges. vol. xxvi. Pp. 3047, 1893. 
8 Tbid. vol. zis. p. 245. 
