INDEX 



667 



2,8-Dichloroadenine nucleosides, syn- 

 thesis of, 150 

 2,4-Dichlorobenzenediazonium chloride, 



131 

 2,8-Dichloro-6-diethylaminopurine, syn- 

 thesis of, 130 

 2,5-Dichloropyrimidine, reaction with 



thiourea, 128 

 2,6-Dichloropyrimidine, amination of, 



127 

 Dichroism, 



orientation and, 536-537 

 ultraviolet, 532-545, 552 

 Diesterase, 277, 442 



action, mechanism of, 435 

 deoxyribonucleic acid digests and, 



441-442 

 ribonucleic acid branching and, 434 

 trinucleotide structure and, 429 

 Diethanolamine, purine synthesis and, 



133 

 2,6-Diethoxy-5-methylpyrimidine, nu- 

 cleoside synthesis and, 156 

 2,6-Diethoxypyrimidine, nucleoside sjn- 



thesis and, 155-156 

 6-Diethylaminopurine, synthesis of, 130 

 5,5-Diethylbarbituric acid, see Barbital 

 Diethjdene glycol, paper chromatogra- 

 phy, 251-253 

 Digitoxose, cysteine reaction and, 293 

 Dihydrocytidylic acid, hydrolysis of, 169 

 4,5-Dihydro-6-deoxyuric acid, see Purone 

 Dihydroisobarbituric acid, formation 



from pyrimidines, 121 

 Dihydroorotase, properties of, 621 

 Dihydroorotic acid, 



bacterial growth and, 621 

 hj'drolysis of, 621 

 Dihydroorotic acid dehydrogenase, prop- 

 erties of, 620-621 

 4,5-Dihydropyrimidine glycosides, hj^- 



drolj'sis of, 141 

 Dihydrothymine, 172 

 degradation of, 621-622 

 uracil oxidase and, 622 

 Dihydrouracil, 



degradation of, 621-622 

 formation of, 119 

 occurrence of, 622 

 uracil oxidase and, 622 

 Dihydrouridine, hydrolysis of, 141 



Dihydrouridylic acid, hydrolysis of, 170 

 2,8-Dihj'droxyadenine, 

 deposition of, 96 

 formation of, 595 

 2,6-Dihydroxy-4,5-dihydropyrimidine, 



see Hydrouracil 

 2,6-Dihydrox3'-4-methylpyrimidine, 86 

 2,6-Dihydroxy-5-methylpyrimidine, see 



Thymine 

 2,4-Dihydroxypyrimidines, infrared ab- 

 sorption of, 547 

 2,6-Dihydroxypyrimidine-4,5-dione, see 



Alloxan 

 /3-Diketones, pyrimidine synthesis and, 



125 

 Diketopiperazine, bond lengths in, 452 

 Dimethoxysuccinic acid, 42, 144 

 6-Dimethylaminopurine, occurrence of, 



95, 160 

 Dimethylaniline, 127, 130 

 5,6-DimethyIbenzimidazole, 95 

 5,6-Dimethylbenzimidazole deoxyribo- 

 side, 

 hydrolysis of, 57 

 preparation of, 57, 62 

 5,6-Dimethylbenzimidazole riboside, 

 hj'drolysis of, 57 

 isolation and sj-nthesis of, 31-33 

 1 ,4-Dimethyl-5-chloromethyluracil, prep- 

 aration of, 92 

 2,4-Dimethylpyrimidine, synthesis of, 



130 

 1,4-Dimethyluracil, 92 

 4,5-Dimethyluracil, 90 

 2',3'-DimethyIuridine, 146 

 Dinitrophenyl phosphate, ribonuclease 



and, 559-560 

 Dinucleotide pyrophosphatase, coen- 

 zymes and, 182, 185 

 Dinucleotides, 



deoxyribonuclease and, 579 

 electrophoretic mobilities of, 270-271 

 molar absorptivities and, 520-521 

 nucleic acid hydrolysis and, 196 

 paper chromatography of, 257 

 phosphodiesterase and, 586 

 ribonuclease and, 427 

 Dioxane, paper chromatography and, 253 

 Diphenylamine reaction, 

 apurinic acid and, 343 

 comparative value of, 299 



