A new property of geminal bishydroperoxides: Hydrolysis with the removal of hydroperoxide groups to form a ketone
摘要:
A new property of geminal bishydroperoxide was discovered: the ability to hydrolyze in acid medium in the presence of hydrogen peroxide with the formation of ketones. The most resistant to hydrolysis are the cyclic C(6)-bishydroperoxydes: at room temperature within one day they are practically not hydrolyzed; less stable is bishydroperoxycycloheptane (C(7)): in a day its one fifth part is hydrolyzed. Bishydroperoxydes with the cycles of C(8) and C(12) for the same time hydrolyzed to 80 and 90% respectively. Of the two linear bishydroperoxydes, 2,2-dihydroperoxydecane, with sterically unhindered center, is more resistant to hydrolysis than 6,6-dihydroperoxyundecane.
Sulfamic acid has been used as an active, low-cost and reusable solid catalyst for conversion of ketones and aldehydes to corresponding gem-dihydroperoxides using 30 % aqueous hydrogen peroxide at room temperature. The reactions proceed with high rates and excellent yields.
Generation of Singlet Oxygen from Fragmentation of Monoactivated 1,1-Dihydroperoxides
作者:Jiliang Hang、Prasanta Ghorai、Solaire A. Finkenstaedt-Quinn、Ilhan Findik、Emily Sliz、Keith T. Kuwata、Patrick H. Dussault
DOI:10.1021/jo202265j
日期:2012.2.3
short 1O2 lifetimes, and there is a need for oxygenations able to be conducted in organic solvents. We now report that monoactivated derivatives of 1,1-dihydroperoxides undergo a previously unobserved fragmentation to generate high yields of singletmolecularoxygen (1O2). The fragmentations, which can be conducted in a variety of organic solvents, require a geminal relationship between a peroxyanion and
分子氧 ( 1 O 2 )的第一个单线激发态是化学、生物学和医学中的重要氧化剂。1 O 2最常通过基态氧的光敏激发产生。1 O 2也可以通过过氧化氢和其他过氧化物的分解化学生成。然而,大多数这些“暗氧化”需要与短1 O 2相关的富水介质寿命,并且需要能够在有机溶剂中进行氧化。我们现在报告 1,1-二氢过氧化物的单活化衍生物经历了以前未观察到的碎裂,以产生高产率的单线态分子氧 ( 1 O 2 )。可以在多种有机溶剂中进行的断裂需要过氧阴离子和被激活以进行异裂裂解的过氧化物之间存在孪生关系。该反应适用于一系列骨架和活化基团,通过原位活化,可直接应用于 1,1-二氢过氧化物。我们的调查表明,碎裂涉及过氧阴离子的限速形成,过氧阴离子通过类似 Grob 的过程分解。
New synthesis of tetraoxaspirododecane-diamines and tetraoxazaspirobicycloalkanes
作者:Nataliya N. Makhmudiyarova、Kamil R. Shangaraev、Lilya U. Dzhemileva、Tatyana V. Tyumkina、Ekaterina S. Mescheryakova、Vladimir A. D'yakonov、Askhat G. Ibragimov、Usein M. Dzhemilev
DOI:10.1039/c9ra06372b
日期:——
An efficient method for the synthesis of new spiro-tetraoxadodecanediamines and tetraoxazaspirobicycloalkanes has been developed by reactions of primary arylamines with gem-dihydroperoxides and α,ω-dialdehydes (glyoxal, pentanedial) catalyzed by lanthanide catalysts. A potential pathway for formation of tetraoxaspirododecane-diamines and tetraoxazospirobicycloalkanes has been proposed that involves
gem-Dihydroperoxides and 1,2,4,5-tetraoxanes were synthesised from aldehydes and ketones catalysed by heteropoly acid/NaY zeolite (HPA/NaY) as a new, effective and reusable solid catalyst using 30% aqueous hydrogen peroxide at room temperature. The reactions proceeded with high rates and excellent yields.
We developed an efficient dihydroperoxidation protocol of various carbonyl compounds with molecularoxygen and anthraquinone in 2-propanol under visible lightirradiation with a fluorescent lamp, which produced corresponding gem-dihydroperoxides in high yields.