Magnetic affected reaction yield

Figure 1 (bottom) schematically depicts a typical dependence of radioluminescence intensity under stationary conditions on the external magnetic field (magnetically affected reaction yield curve, or MARY spectrum)... 

Attempts to optimize the yield were unsuccessful. The main parameters affecting the yield of the Fischer indole reaction are the added acid (AcOH > TFA > HCl > H2SO4) as well as the solvent composition, hi pure water, no reaction was observed, whereas in pure acetic acid, we mainly observed the degradation of the 4-methylhydrazine as evidenced by hydrogen nuclear magnetic resonance ( H NMR) and high-performance liquid chromatography (HPLC) analysis. The best compromise was to perform the Fischer indole reaction in a 75/25 ACOH/H2O mixture at 80°C (Table 6.1). 

Here we will confine ourselves mainly to the incoherent (rate) description of spin conversion, which provides the simplest way to account for spin-forbidden recombination of RIPs in complex photochemical reactions. Since ks from Eq. (3.557) depends on H through co-(H), the charge separation yield is also affected by the magnetic field. Therefore, the ratio... 

Measurement of the influence of different micellar environments on proton transfer from excited states of 3-hydroxyflavone allows estimates to be made of micelle concentrations from measurement of the tautomer emission yield. Proton transfer reactions of benzimidazole excited singlet states have also been studied in ionic micelles. Magnetic fields are found to affect the behaviour of radicals generated by the photodissociation of benzil in micellar media. The starburst dendrites which are formed by anionic macromolecules in interaction with both anionic and cationic surfactants have been examined by pyrene fluorescence. Benzo[k]fluoranthrene fluorescence has served as a probe of the effects of metal salts on bile salt aggregation. The incorporation and distribution of benzoquinone into liposomes containing amphilic Zn(II) porphyrin has been followed by its effect on the quenching of the excited state °. A comparison of the photochromism of spirobenzpyran derivatives in unilamellar surfactant vesicles and solvent cast surfactant films has also been reported. ... 

The trimethylaluminum is added slowly to the gallium trichloride over a period of about one hour. The reaction is extremely exothermic and is controlled by varying the addition rate of trimethylaluminum. External cooling should be avoided, as this may adversely affect the product yield. Initially, a few drops at a time are added later, the rate may be increased. The flask contents are stirred magnetically during the reaction and distillation. 

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