Ferf-Butyl perbenzoate

Table 1. Dendronized monomers, polymerization conditions, as well as molecular weights of the polymers obtained. Molecular weights are not comparable (see text). (AIBN = azoisobuty-ronitrile, DBPO = dibenzoyl peroxide, BPB = ferf-butyl perbenzoate)... 

C. Electron Transfer Reactions (ETR) of ferf-Butyl Perbenzoates... 

Absolute and relative rates of ETR of ferf-butyl perbenzoates with dimethyl sulfide at various temperatures (T = 80, 90, 100 and 110°C) were obtained. Hammett correlations at each temperature were also studied (Table 7). The Hammett slopes are positive and the reactions are better correlated with a rather than with a 1. This indicates that a negative charge resides on the benzoyloxy group without conjugation with the phenyl... 

Suitable inert solvents include methyl ethyl ketone, benzene, ethylbenzene and toluene. Suitable initiators include peresters and peroxycarbonates such as ferf-butyl perbenzoate, ferf-butyl peroxy isopropyl carbonate, fcrf-butyl peroctoate, tert-butyl peroxy isonon-... 

Additional proof of the assigned structure was provided by the preparation of both epimeric 7-hydroxyconessines by allylic oxidation of conessine with ferf-butyl perbenzoate (88). The possibility that 7a-conessine is an artifact, arising by air oxidation of conessine in the course of the isolation procedure, was excluded by a model experiment. On the other hand, the possibility cannot be excluded that it may have been formed from conessine bv the action of microorganisms in the bark (88). 

In addition to the symmetrical peroxides, asymmetrical peroxides are also in use, for example ferf-butyl perbenzoate, ferf-butylcumyl peroxide and some polymeric peroxides (403). 

The synthesis of ferf-butyl ethers by the reaction of Grignard reagents with tert-butyl perbenzoate appears to have considerable... 

In parallel developments, the aspect of a waste-free transformation was temporarily neglected in favor of improvements in the selectivity and efficiency of the C—H functionalization. Using rerr-butyl perbenzoate as the oxidant, which is converted to benzoic acid and ferf-butanol in the process, the catalytic tnrnover was substantially enhanced up to TON = 67 with furan substrates in comparison with the original protocol [13]. 

Hydroxythiophenes. 2-Bromothiophene allowed to react with Mg and tert butyl perbenzoate (s. Synth. Meth. 16,277) 2-ferf-butoxythiophene (Y 70-76%) treated with a little p-toluenesulfonic acid, heated 5-10 min. under Ng at an oil bath temp, of 155°, then the product distilled in vacuo 2-hydroxythiophene (Y 89-94%). G. Frisell and S.-O. Lawesson, Org. Synth. 43, 55 (1963) f. e. s. Arkiv Kemi 17, 393 (1961). 

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