THE CHEMISTRY OF PHOTOSYNTHESIS 277 



From 1 there could be formed by rearrangement : 



H OH OH H 



I I I I 

 CH2OH _C — C — C — C — CH:0, 



I I I I 

 OH H H OH 



d-galactose 



H OH OH OH 



I I i I 

 CHoOH _C — C — C — C — CH:0 



I I I I 

 OH H H H 



d-talose 



H OH OH O 



I I I II 

 CH,OH _C — C — C — C — CH2OH, 



I I I 

 OH H H 



d-tagatose 



H OH H O 

 CHoOH — C — C — C — C — CH2OH 



OH H OH 



1-sorbose 



From 2 by rearrangement : 



H OH O OH 



CH2OH — C — C — C — C — CH2OH 



I I i 



OH H H 



and 



H OH O H 



CH2OH _C — C — C — C — CH2OH 



OH H OH 



a and P-d-galtose 



From 3 1-gulose and 1-idose would be formed. As these sugars are not 

 formed when d-galactose is treated with alkalies Nef concludes that the 

 p-l,2-d-galactosendiol is not formed. Similarly 4, which is identical with 



