672 



INDEX 



S-Hydroxyadenine, 2,8-dihydroxyade- 



nine and, 595 

 Hydroxy aldehydes, cysteine-sulfuric 



acid reaction and, 295 

 2-Hydroxy-6-aminopurine, see Isogua- 



nine 

 2-Hydroxy-6-aminopyrimidine, see Cyto- 



sine 

 2-Hydroxy-4,6-dimethylpyrimidine, 

 dichroism of, 537-538 

 dissociation constants of, 456 

 hydroxyl bond length in, 449 

 2-Hydroxyethyl dimethyl phosphate, 



hydrolysis of, 415 

 Hydroxyiminocyanoacetate, purine syn- 

 thesis and, 132 

 Hydroxylamine, 



deoxyribonuclease and, 582 

 reaction with thymine, 304 

 co-Hydroxylevulinaldehyde, 53 

 o;-Hydroxylevulinic acid, 

 cysteine reaction and, 293 

 diphenylamine and, 288 

 formation of, 59 

 2-Hydroxy-5-methyl-6-aminopyrimidine, 



84 

 5-Hydroxymethylcytosine, 258, 346, 370, 

 371 

 deamination of, 118 

 discovery of, 88, 89 

 formic acid and, 259 

 isolation of, 188, 245 

 occurrence of, 61, 90, 136, 188, 346 

 paper chromatography of, 249, 251, 



253, 254 

 perchloric acid and, 258 

 properties of, 90 

 stability to acids, 117 

 ultraviolet absorption of, 500 

 5-Hydroxymethylcytosine deoxyribo- 



side, 189 

 2,6- bis (Hydroxymethyl) - 4 - hydroxy - 5 - 



methylpyrimidine, 91 

 6-Hydroxymethyl pteridine, guanase 



and, 598-599 

 4-Hydroxy-6-methylpyrimidine, synthe- 

 sis of, 128 

 5-Hydroxymethylpyrimidines, synthesis 



of, 130 

 2 - Hydroxy - 4 - methyltetrahydropyrimi - 

 dine, 119 



4-Hydroxymethylthymine, 91 



4-Hydroxymethyluracil, 91 



5-Hydroxymethyluracil, 

 preparation of, 92 

 stability of, 92 



2-Hydroxy-5-nitropyrimidine, formation 

 of, 125 



6-Hydroxypteridine, tautomerism of , 115 



2-Hydroxypurine, reduction of, 119 



6-Hydroxypurine, see Hypoxanthine 



8-Hydroxypurine, xanthine oxidase and, 

 612 



2-Hydroxypyrimidines, infrared absorp- 

 tion of, 547 



4-Hydroxypyrimidines, infrared absorp- 

 tion of, 547 

 synthesis of, 128 



6-Hydroxypyrimidine, reduction of, 120 



2 -Hydroxy -4,5,6 - triaminopyrimidine, 

 isoguanine synthesis and, 133 



5-Hydroxyuracil, 104 



Hyperchromic effect, 



ribonucleic acid digests and, 569-570 



Hypoxanthine, 2, 124, 165 

 adenine oxidation and, 595 

 cationic exchangers and, 218 

 discovery of, 97-98 



dissociation constants of, 456-457, 458 

 formation of, 84 

 infrared absorption of, 547 

 occurrence of free base, 94 

 oxidation of, 609, 612 

 paper chromatography of, 251, 253 

 reaction with triethylamine, 130 

 reducing agents and, 119, 120 

 stability to alkali, 118 

 synthesis of, 85, 131, 132, 135 

 ultraviolet absorption of, 498-499, 502 

 uridine phosphorylase and, 606 

 xanthine oxidase inhibition and, 612 



Hypoxanthine argentipicrate, 124 



Hypoxanthine deoxyriboside, 48-49, 157, 

 see also Deoxyinosine 

 arsenolysis of, 58-59 

 formation of, 142 

 glycosidic structure of, 147 

 ultraviolet absorption of, 504 



Hypoxanthine thiomethylpentoside, 



synthesis of, 157-158 



Hypoxanthosine, see Inosine 



