696
INDEX
Water (continued)
hydrogen bonding 50
as nucleophile in hydrate formation 234
as nucleophile in S N 1 and S N 2 reactions
198
pK a values
as acid 136
as base 136
Wave equation 20
Wave function 20
phase sign 22, 25
Wavy bond 226, 470
Wedge–dot representation 32, 55
butane 58
ethane 57
Xanthine, in purine metabolism 451
Xanthine oxidase, in uric acid formation 451
Xylose
hemiacetal form, structure 471
structure and stereochemistry 465
Xylulose, structure and stereochemistry 464
Ylid (ylide)
definition 437
from TPP 438, 605
Zidovudine (AZT), structure 559
Zig-zag chain 2
Zolmitriptan, structure 447
Zwitterion
amino acids 160, 501
definition 151