( 272 ) 

 then dissociation : CgH. — C C — CgH^ 



' t. ' 5 



/ 



then addition to: C,H,— C -C— C,H, 



i \C.H, 



'«-"■'S 



O 



tlicn formation of C«H.— C QC^H^),. 



If, however, we represent the matter by structural formnhae we 



get 



OH 



C H.— C C— C,H, -> t' H3-C C,H 



C^^.4 



/\ OH 



I I i II 



OH ..^ OH .,„ 



C,H-C- C-CJI/) -» C,H-C C-C,H 



6*^5 





/ 



i{ C«H, 



C,H-C C-aH3 



This sliows now in the phiinest manner tliat the core 1 is 

 attached to (Hlferent C-atoms l)etV>re and after the migration. If we, 

 therefore apply this representation to derivatives of l)enzpinacone, 

 the group or the atom in the core I of benzpinacone then occupies 

 a dilferent position from that in the benzpinacoline obtained from 

 the same. 



1) Which H-atom ot core I migrates to the group CcH^ is not stated by Nef; 

 the orlhoplaced H-atoin was taken arbitrarely. 



