Illuminations were carried out with a XBO 450-W Xe lamp. The IR and UV content of the light was removed by a 16 cm water jacket and a 450 nm cut-off filter. Hydrogen and oxygen were analyzed by gas chromatography. Alternatively O2 detection was carried out with an END-0-MESS instrument[91.In principle, the bonds marked in Scheme 1 can be cleaved (a'-, a-, and @cleavage) on phot9ysis ofosulfonamide8 and sulfonylureas. The radicals R'XS02, RS02, and RS02X should eliminate SO2 and form simple alkyl or aryl radicals, which then stabilize by recombination or by abstraction of hydrogen from the solventI2]. ff' ffScheme 1 X = 0, NH, NR"[ l ] K. Kalyanasundaram, M . Grbfzel. Angew. Chem. 91, 759 (1979); Angew.An X-ray structure analysis16] of (3), M = Pd, X = C1, confirms the bonding of the metal to the phosphorus and supports the cis-arrangement in the crystal (Fig. 1). The cyclo-

No abstract

No abstract

Während d-Isoglucosamin beim Erhitzen mit Diäthylamin das bereits auf anderem Wege hergestellte „Fructosazin” der Formel III liefert, erhält man durch Wasserabspaltung aus d-Glucosamin in heißem Eisessig ein um 1 Sauerstoffatom ärmeres „Desoxyfructosazin”. Für dieses wird durch hydrierend-hydrolytische Spaltung zu 1 Mol. d-Isoglucosamin und 1 Mol. 3-Desoxy-d-isoglucosamin die Struktur VII bewiesen