Reference

Dalbergia species - XV

Dalbergia species - XV. Dalcriodain, a binary neoflavanoid. Donnelly, Dervilla M. X.; Criodain, T. O.; O'Sullivan, M. (Dep. Chem., Univ. Coll. Dublin, Dublin, Ire.). Proc. R. Ir. Acad., Sect. B, 83 B(1-16), 39-48 (English) 1983. CODEN: PRIBAN. ISSN: 0035-8983.In this experiment, several chemicals are used like 81474-74-0 and 135-77-3 DOCUMENT TYPE: Journal CA Section: 11 (Plant Biochemistry) Section cross-reference(s): 43 Seventeen natural products, including the 1st binary neoflavanoid dalcriodain (I) and the 1st examples of a xanthone, 2,7-dihydroxy-3-methoxyxanthone (II) and a flavin, 4',7-dihydroxyflavan (III), were isolated from the heartwood of D. latifolia Rexb. The structure of II was confirmed by synthesis of 2,3,7-trimethoxyxanthone by cyclization of 2-hydroxy-2',4',5,5'-tetramethoxybenzophenone. .

Experimental investigation of highly exergonic outer-sphere electron-transfer reactions

Experimental investigation of highly exergonic outer-sphere electron-transfer reactions. Indelli, Maria Teresa; Ballardini, Roberto; Scandola, Franco (Ist. Chim., Univ. Ferreara, Ferrara 44100, Italy). J.Chemicals with cas numbers 135-77-3 and 621-23-8 also play role. Phys. Chem., 88(12), 2547-51 (English) 1984. CODEN: JPCHAX. ISSN: 0022-3654. DOCUMENT TYPE: Journal CA Section: 74 (Radiation Chemistry, Photochemistry, and Photographic and Other Reprographic Processes) Some 20 rate consts. of highly exergonic thermal electron-transfer reactions between reduced metal-polypyridine complexes and radical cations of arom. mols. were measured by laser and flash photolysis techniques. The rate const. values remained at diffusion-controlled levels up to free energy changes of -528 kcal/mol. Such exerogonicity values are > than twice the value at which the classical Marcus theory, under the most favorable assumption, predicts the onset of the inverted behavior to occur. In the reactions studied, the energetics of the products (which are mols. in their std. oxidn. states) is well-known, and the formation of electronically excited states can be very safely ruled out. Among the possible reasons for the failure to observe the inverted behavior, quantum effects (nuclear tunneling) play the major role in these systems. Measurements of the yields of formation of the reactants in the flash photolysis expts. also point toward the lack of any inverted behavior in these reactions. .