.8 



Robinson, The Conjugation of Partial Valencies 



resembling it in essential respects. Separation of xy from 

 the complex A, however, involves the following- result : 



a x — y 



R 



R— C C— R 5 



R 1 , 



that is, the group R 1 is transferred to the adjacent carbon 

 atom. In the pinacone-pinacoline reaction, a is oxygen, x is 

 hydrogen and y is hydroxyl. In the borneol-camphene or 

 Wagner rearrangement a is -CH 2 — , x is hydrogen, and y 

 is hydroxyl or a halogen atom. It will be found on inspection 

 that a very large number of molecular changes, particularly 

 in the terpene series, can be brought under the above generali- 

 sation. In view of the complexity of the formulae the follow- 

 ing examples may be quoted : — 



Borneol-Camphene. 



(a) CrL-~ H(x) 



'2 



s 



CH 



0H(y) 



CMe ? ' 



CH. 



CH 



CH, 



st 



CMe, 



CH 



■H 



*;0H 



CH 



CH. 



CH; 



Mz H 



\ 



OH 



CH 



CH 2 ™e 2cH _ 



CH' 



CH 2 



CH 



^C = CH, 



CH, 



CH, 



CMe, 



V H / 



CH 



