Investigation into Phenoxonium Cations Produced during the Electrochemical Oxidation of Chroman-6-ol and Dihydrobenzofuran-5-ol Substituted Compounds
摘要:
A series of chroman-6-ol and dihydrobenzofuran-5-ol based compounds with structures similar to vitamin E were examined by cyclic voltammetry and controlled potential electrolysis. The compounds displayed characteristic voltammetric features that enabled their electrochemical behavior to be interpreted in relation to the oxidation mechanism for vitamin E. The electrochemical experiments indicated the presence of several oxidized species: cation radicals, phenoxyl radicals, phenoxonium ions, hemiketals, and p-quinones, whose lifetimes varied depending on the extent of methylation of the aromatic ring (R(1), R(2), R(3)) and the nature of substituents R(4) and R(5).
There are disclosed a polybutadiene composition comprising:
a polybutadiene type polymer, and
at least one compound selected from
a compound of formula (I-1):
1
or a compound of formula (1-2):
2
wherein R
11
to R
28
are the same or different and independently represent a hydrogen atom, an alkyl group, or the like; or
a compound of formula (II):
3
wherein R
1
to R
10
independently represent a hydrogen atom, an alkyl group, or the like; or
a styrene-butadiene copolymer, and a benzoin compound; and an article molded therefrom, and processes for producing the composition and the molded article.
公开了一种聚丁二烯组合物,其中包括
聚丁二烯类聚合物,以及
至少一种选自以下物质的化合物
式(I-1)化合物:
1
或式(1-2)化合物:
2
其中 R
11
至 R
28
相同或不同,且各自代表氢原子、烷基或类似物;或
式 (II) 的化合物:
3
其中 R
1
至 R
10
分别代表氢原子、烷基或类似物;或
苯乙烯-丁二烯共聚物和安息香化合物;以及由其模塑的制品,以及生产该组合物和模塑制品的工艺。
TAKIZAWA, YASUOMI;TATEISHI, AKIRA;SUGIYAMA, JUNICHI;YOSHIDA, HIROYUKI;YOS+, J. CHEM. SOC. CHEM. COMMUN.,(1991) N, C. 104-105