1 -Ethoxycarbonyl-1 -pyrrolidino

Unlike the reversed shift of the emission band compared to the dihydrogen addend type, the singlet lifetime in the bis- and tris(bis-(ethoxycarbonyl)-methylene) derivatives is increased comparable to the former multiple adducts. The values range from 1.7 to 3.1 ns (tris-adduct), depending on the distorted T7-electron system of the fullerene core [67,108], In comparison to C6o, the fluorescence quantum yield for the malonic ester hexaadduct is increased by the factor 10 (30 X 10 4) [67,111], In the case of both pyrrolidino hexa-adducts (Th 14 and D3 15, Fig. 13), the effect is remarkably higher. The fluorescence quantum yields are increased about 100-fold (-0.02) compared to C6o. On the other hand, the singlet lifetime is only partly increased with -3.5 ns [111,112],... 

The 6-ethoxycarbonyl group of compound 94 (R1 = pyrrolidino, R2 = R3 = C02Et) was unaffected during reaction with ammonia solution or n-propanolamine, giving instead the corresponding amides 151a,b (88LA633). 

E19a, 1243 (C-N02 + C-M) 1-Buten 2-Nitro-l-pyrrolidino-E15/2, 1381 (NH-R - NR2) Carbodiimid N-tert.-Butyl-N -ethoxycarbonyl- E4, 1265 (aus Thioharnstoff-Der.) Cyclohexan l,3-Dimethyl-5-... 

Pyrimidine 6-Chloro-5-cyan-4-ethoxycarbonyl-2-pyrrolidino-E9b/1, 23 [(NC)2C-CC1-COOR + R2C-CN]... 

Cl4H18N2O2 r 2,5-Bis(pyrrolidino)-1,4-benzoquinone, 45B, 210 Cl4H18N2O3, E-5 -Ethoxycarbonyl-3,4-dihydro-3, 4 -dimethyl-5(1H)-2,2 -pyrromethenone, 43B, 276... 

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