Generation of acyloxyl spin adducts from N-tert-butyl-α-phenylnitrone † (PBN) and 4,5-dihydro-5,5-dimethylpyrrole 1-oxide (DMPO) via nonconventional mechanisms
作者:Lennart Eberson、Ola Persson
DOI:10.1039/a701479a
日期:——
The reaction between
N-tert-butyl-α-phenylnitrone (PBN) and
carboxylic acids has been studied. Two mechanisms are discernible: the
generation of PBNË+ by oxidation of PBN with a
photochemically produced excited state [from either
2,4,6-tris(4-methoxyphenyl)pyrylium ion 2+ or
tetrachlorobenzoquinone 4], followed by reaction with RCOOH, or the
addition of RCOOH to PBN to give a hydroxylamine derivative, followed by
thermal oxidation by a weak oxidant. The latter sequence is the
ForresterâHepburn mechanism. In this mechanism, neither
2+ nor 4 is effective as an oxidant, whereas bromine could be
used. Thus only oxidants with redox potentials 0.1 V
(SCE) are reactive enough to oxidize the intermediate hydroxylamine.
This behaviour is in agreement with the redox reactivity of
hydroxylamines.For the cyclic nitrone, 4,5-dihydro-5,5-dimethylpyrrole
1-oxide (DMPO), acyloxyl spin adducts have been prepared by the
photochemical route.The reaction between dibenzoyl peroxide and PBN to give
PhCOOâPBNË is not catalysed by added
PhCOOH. It could be shown that the rate of formation of
PhCOOâPBNË is compatible with the rate
of thermal decomposition of dibenzoyl peroxide. Thus dibenzoyl
peroxide does not support the ForresterâHepburn mechanism,
in agreement with its redox potential of ca. -0.2
V.
N-叔丁基-α-苯基硝酮(PBN)与羧酸的反应已被研究。可以区分出两种机理:通过光化学产生的激发态氧化PBN生成PBN⁺+,随后与RCOOH反应,或者RCOOH加成到PBN上形成羟胺衍生物,随后由弱氧化剂热氧化。后一序列是Forrester-Hepburn机理。在该机理中,2+和4都不作为氧化剂有效,而溴可以被使用。因此,只有氧化还原电位大于0.1 V(SCE)的氧化剂才足以氧化中间体羟胺。这种行为与羟胺的氧化还原反应性一致。对于环状硝酮,4,5-二氢-5,5-二甲基吡咯1-氧化物(DMPO),通过光化学途径制备了酰氧基自由基自旋加合物。过二苯甲酰与PBN反应生成PhCOO⁻PBN⁺+不通过添加的PhCOOH催化。可以表明,PhCOO⁻PBN⁺+的生成速率与过二苯甲酰的热分解速率相符。因此,过二苯甲酰不支持Forrester-Hepburn机理,与其氧化还原电位约为-0.2 V一致。