242 SCIENCE PROGRESS 



The tetra-substituted ammonium salts, such as HR,R,R.R.I, 

 are much more stable, but no optically-active trialkylammomum 

 silt has yet been prepared, a fact that is without doubt : to be 

 a ibu ted" to the readiness with which it would n.cem .« by d»- 

 sociating into the base and acid, e.g. NRR-R.H I £ N R.KA+ H L 

 In thts respect c^on Presents a « contra, to mand 



j„ m e Hno- as in terp no ene (formula 11.) or it tne 



*,° W ti h nd in the ring s moved towards the methyl group 

 double bond i the nn . » Qf is eliminated by the 



idSn ofh'ydTgrchUe, or any other agent of the type ; 



HX (formula IV.). 



CH, CH, CH. CH. CH^CH, CH^CH, 



c 



I 



CH 



C 



c 



I 



CH 



c 



I 



CH 



/\ /\u TH CH CH, CH, 



CH, CH 2 CH 2 CH, CH, CH 2 



CH U CH 2 CH 2 CH CH, 



CH CH 2 



^/ V c 9 



c 



c 



CH 3 CH, 



Br CH, 



CH; < . , rlrtive) Inactive Hydrocarbon Inactive Hydrobromide 



Limonene (active) Terpinolene (inactive) Inactive ny ^ 



II. 111> 



I. 



