Tris photoproduction

The activation of H2 photoproduction by CaCl2 was observed not only with Tris buffer as an electron donor but with sucrose, dithiothreitol, or methanol as well. BaCl2, like CaCl2, enhanced the rate of H2 photoproduction by a factor of about 30. Chlorides of monovalent metals increased the reaction rate in the system Tris-Ti02-hydrogenase insignificantly [2],... 

The experimental first-order decay rate for pentachlorobenzene in an aqueous solution containing a nonionic surfactant micelle (Brij 58, a polyoxyethylene cetyl ether) and illuminated by a photoreactor equipped with 253.7-nm monochromatic UV lamp is 1.47 x lO Vsec. The corresponding half-life is 47 sec. Photoproducts reported include all tetra-, tri-, and dichlorobenzenes, chlorobenzene, benzene, phenol, hydrogen, and chloride ions (Chu and Jafvert, 1994). Chemical/Physical. Emits toxic chlorinated acids and phosphene when incinerated (Sittig,... 

The specific radioactivities of uracil were 14C, 0.6 mC/mAf T, 7.75 inC/mAf ratio T/14C = 12.9. The concentration of uracil was 10 3M. Photoproducts were isolated by paper chromatography with n-butanol/water, 86.14. Spots were eluted with water and radioactivity determined in a Tri Carb 314 EX (Packard Instruments). 

The homogeneous complex RhCl(dpm)3 acts also as hydroformylation catalyst [159], Upon illumination of the catalytic photosystem Ru(bpy) +/ascorbic acid/RhCl(dpm)3- in the presence of ethylene and carbon monoxide, propionaldehyde is obtained as photoproduct. Similarly, propene yields the hydroformylation product butyraldeyde. The facts that no hydrogenation products are produced in this assembly, and that hydridocarbonyl-tris-(diphenylphos-phinobenzene-3-sulphonate) rhodium(I), RhHfCOXdpm) -, substitutes RhCl(dpm)3- as catalyst in the photosystem to yield the hydroformylation products at similar efficiency, suggest that the homogeneous catalyst RhClfdpmJj -is transformed into a new catalytic species under CO. A possible route for the interconversion of RhCl(dpm)3 into the hydroformylation catalyst is provided in Scheme 4. 

The thiochromene 31 is the final product arising from the photoirradiation of tris-(2-benzo-[i]thienyl)methane. The primary photoproduct is a cyclopropane derivative formed by a di-3t-methane rearrangement <03TL751>. 

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