Upon UV irradiation of CM fullerene in 1 : 1 toluene/(methanol, acetonitrile, or toluene) solutions the photoexcited state of c 6 0 was quenched in the presence of Et3N, and single lines of anion radicals A and B were observed in in situ EPR measurements. The formation of A is accompanied by the appearance of a band at 1077 nm in vidnear-IR spectrum characteristic of C 6 O monoanion. Radical B is a consecutive product of A (probably associate of C6O' -or c6!] dianion). Monoanion A with g = 2.0000 and peak-to-peak width, pp = 0.09 mT converts to radical B with g = 2.0006 and pp = 0.035 m T increasingly after prolonged irradiation and at higher ratios of Et3N:Cbo. The shortest lifetime of C60 monoanion was found in the presence of methanol ( i l l : = 28 s), and it increased considerably upon the addition of tetrabutylammonium perchlorate (TBAP) salt (iIn2 = 210 s in 0.38 M TBAP) or if methanol was replaced by acetonitrile (t112 = 260 s). Lowering the temperature from 300 to 200 K, the linewidth of A decreases from pp(300 K) = 0.09 m T to pp(200 K) = 0.038 mT. At 100 K a broadened line spread over 3 mT was found with a narrow line superimposed on it. The ratio of the broadened to the narrow line increases with the increased time intervals and is more pronounced following prior prolonged irradiation at 300 K or upon the addition of TBAP.

Aus Fumar‐ bzw. Acetylacrylsäureestern wie (I) und Chinon (II) entstehen in Eisessig Cumarinderivate wie (III) (59 bzw. 69% Ausbeute).

Die Reaktion des Aminofumarsäureesters (I) mit Chinon (II) in Gegenwart von Bortrifluoridätherat liefert bei Zimmertemperatur das Aminocumarin (III) (52%) und daneben geringe Mengen des Benzodipyrons (IV).

Die Fumarsäure‐ Derivate (I) kondensieren sich mit den aromatischen Aldehyden (II), bei längerem Stehen in Eisessig bei Zimmertemperatur, zu den Furanonen (III).

Der Ester (Ia) reagiert mit dem Keton (II) in Gegenwart äthanolischer Zinkchloridlösung zu dem Cumarin (III), während der Ester (Ib) nach Umsetzen mit (II) das Cumarin (IV) (5% Ausbeute), das Benzopyron (V) (3,0%) und das Indol (VI) (4,8%) liefert.