Benzenesulfonamides represent a hydrogen donor-acceptor moiety that is
changed to a bisacceptor by deprotonation. The dimerization constant
of N-tosyl-n-butylamine (7) and N-tosyl-L-alanine (9-H) in CDCl3 and t
he binding constant of the tetrabutylammonium salt 7 . NBu(4) to urea
in DMSO were determined by H-1-NMR titration methods. The X-ray struct
ure analysis of S-H is reported.