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 



R-C 



R 2 

 / 

 C— R 3 



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 hydroxy 1. In the borneol-camphene or 

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

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

 that a verv 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 : — 



(a) CrL— H(x 

 I 2 



(R») CH 



Bomeol-Camphene. 

 <) 



0H(y) 



I! 



CH 2 H 



CH. 



CMe, 



CH 



\y 



:0H 



CH 



CH, 



CH' 



CH 2 H 



II " 



C \ 

 CH 



OH 



CH; 



CH 2 C^cH. 



CH 



/CH 

 CHf I ^C=CH ; 



CH- 



CH. 



CMe. 



CH 



s 



