Tabelle 1 2-Acylthiosemicarbazone 2 und 4-Acyl-2-acylamino-4,5-dihydro-l, 3,4-thiadiazole 3
R4Ausb./% Schmp.l)/"C UV3) EtOH I R (KBr) &lax/nm
Azomethinfarbstolfe aus ~-(il.-Cyanoethyliden)-3-methyl-1-phenyl-2-pyrazolin-6-onLothur llennig, Detlef Henctler Karl-Marx-Uriiversitat, Sektion Chemie, Lripzig, DDH-70 L O Professor Dr. Gerhurd Nnnn zunz 60. Geburtstay gewidinet 4-Yliden-2-pyrazolin-5-one konnen mit p-Phenylen-dlamin-IJcrivaten in einer oxidativen Farbkupplungsreaktion Azomethinfarbstoffe bilden, da sie in wal3rig-alkalischer Losung hydrolysicren und somit die Farbstoffbildung direkt iius den in der 1-
Neighbouring Group Participation in Electrophilic Additions Initiated by N‐Bromosuccinimide
Starting from endo‐5‐hydroxymethyl‐norbornene as well as 5‐(hydroxymethyl)‐methyl‐cyclohexene the methoxybromination procedure gives cyclic ethers by participation of the hydroxymethyl group. Unsaturated formyl compounds or their acetals, respectively by contrast, gave methoxybromination products. After oxidation of the functional groups bromo methoxy methyl carboxylates are formed depending on the molar ratio of the substrate to NBS.
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