Journal of the Chemical Society 1876. [antikvár]

JOURNALofTHE CHEMICAL SOCIETY.PAPERS READ BEFORE THE CHEMICAL SOCIETY^I.Isomeric Terpenes and their Derivatives. (Part V.)By G. H. Beckett and 0. R. Aldee Wright, D.Sc., Lond., Lecturer on Chemistry in St. Mary's Hospital Medical School.§ 1. Peppermint Oamphor from Japan.Oppenheim has already shown (this Journal [1], xv, 24) that this^substance is an alcohol {menthylic alcohol) of the form CioHigOH, andj^f that by the action of dehydrating agents it splits up into water and ait^hydrocarbon, menthene, CioHis, bearing the same relation to terpenes that these do to cymene (i.e., containing Ha more).Through the kindness of Mr. John Moss (Messrs. Corbyn and Co.), we received several ounces of crystallised Japanese camphor, together with the same amount of the so-called liquid camphor imported along with the crystals. The crystals were found by Oppen-heim to melt at 36°, Mr. Moss observing 39° with the sample sent to us as the melting point, and 37'6° as the solidifying point. On attempting to crystallise the solid camphor from weak alcohol no crystals could be obtained, but an oil separated, which, on exposure to air (after separation by a tap-funnel from the aqueous liquid) became a mass of crystals. After several weeks' exposure to air, these crystals melted at 42° in a capillary tube, boiled at 212° (corrected ; Oppenheim found 210°), and gave the following numbers on combustion :I 1 01945 gram gave 0-5445 00^ and 0-226 H^O. I ;Calculated.Found.Cio 12076-9276-35l' 'H20 2012-8212-910 16 10-26 VOL. XXIX.____i'lVl156 100-00iji';'"