New sterically hindered di-o-quinones of the biphenyl series
摘要:
New di-o-quinones of the biphenyl series, namely, 2,2'-dialkyl-5,5'-di-tert-butylbiphenyl-3,4,3',4'-diquinones, were synthesized. Their structures were established by IR and NMR spectroscopy. The molecular structure of 2,2'-dimethyl-5,5'-di-tert-butylbiphenyl-3,4,3',4'-diquinone was established by X-ray structural analysis. The structure is characterized by orthogonal (the torsion angle is 82.9 degrees) mutual arrangement of o-benzoquinone fragments. ESR studies demonstrated that chemical reduction of diquinone proceeds in four one-electron stages to form paramagnetic mono- and trianions as intermediates. Quinopyrocatechols, which are intermediates in the synthesis of di-o-quinones, were isolated and characterized.
取代基中的反应的效果3,6-二-叔丁基- о苯醌与有机锌和organocadmium化合物,导致三种类型的产品:3-烷基-6-叔丁基- о -benzoquinones,4-烷基-3,6-二-叔丁基- о -benzoquinones和2-烷氧基- (或2-苯氧基)-3,6-二-叔-butylphenols。相关分析提供了证据,表明第一类和第二类产物是通过亲核的1,2-和1,4-加成形成的,而取代的苯酚则是由单电子转移产生的。
interaction between organometallic R2M and carbonyl compounds. The reaction of organometalliccompounds R2M with o-quinone, where R = Ph, Me, Et, Pr, 1Pr or tBu and M ≡ Zn, Cd, and Al, proceeds in two ways: (1) the single-electron oxidation of the organometalliccompound by o-quinone, resulting in derivatives of alkyl(phenyl)oxyphenols; (2) the polar 1,2 and 1,4 addition of organometallic molecules to o-quinone
Study of the reaction of 3,6-di-tert-butyl-о-benzoquinone with organozinc and organocadmium compounds
作者:Yu. A. Kurskii、N. O. Druzhkov、A. N. Egorochkin、G. A. Abakumov
DOI:10.1134/s1070363216010072
日期:2016.1
the reactions of 3,6-di-tert-butyl-о-benzoquinone with organozinc and organocadmium compounds, leading to three types of products: 3-alkyl-6-tert-butyl-о-benzoquinones, 4-alkyl-3,6-di-tert-butyl-о-benzoquinones, and 2-alkoxy-(or 2-phenoxy)-3,6-di-tert-butylphenols. Correlation analysis gave evidence to show that the first- and second-type products are formed by nucleophilic 1,2- and 1,4-addition, while
取代基中的反应的效果3,6-二-叔丁基- о苯醌与有机锌和organocadmium化合物,导致三种类型的产品:3-烷基-6-叔丁基- о -benzoquinones,4-烷基-3,6-二-叔丁基- о -benzoquinones和2-烷氧基- (或2-苯氧基)-3,6-二-叔-butylphenols。相关分析提供了证据,表明第一类和第二类产物是通过亲核的1,2-和1,4-加成形成的,而取代的苯酚则是由单电子转移产生的。
New sterically hindered di-o-quinones of the biphenyl series
作者:G. A. Abakumov、V. I. Nevodchikov、N. O. Druzhkov、L. N. Zakharov、L. G. Abakumova、Yu. A. Kurskii、V. K. Cherkasov
DOI:10.1007/bf02495211
日期:1997.4
New di-o-quinones of the biphenyl series, namely, 2,2'-dialkyl-5,5'-di-tert-butylbiphenyl-3,4,3',4'-diquinones, were synthesized. Their structures were established by IR and NMR spectroscopy. The molecular structure of 2,2'-dimethyl-5,5'-di-tert-butylbiphenyl-3,4,3',4'-diquinone was established by X-ray structural analysis. The structure is characterized by orthogonal (the torsion angle is 82.9 degrees) mutual arrangement of o-benzoquinone fragments. ESR studies demonstrated that chemical reduction of diquinone proceeds in four one-electron stages to form paramagnetic mono- and trianions as intermediates. Quinopyrocatechols, which are intermediates in the synthesis of di-o-quinones, were isolated and characterized.