The structures of quartromicins A1, A2, and A3: novel macrocyclic

8947

J. Am. Chem. SOC.1991, 113, 8947-8948 Table I. 'H NMR Dataa of Selected Dihydrogen Complexes [OS"(NH,)~(H~)L]~+/'+ L AN PY Im Ic1-1 1.60 -7.44 -7.43 -10.78' -7.80' d(H2). P P ~ 20.3 19.6 17.1 12.5 10.2 JHD, Hz

DIO -1 1.35 8.1

(CDJ2C0

Br-

-1 1.37"' 4.0 572 74d

-1 1.29