Solvent-Free One-Step Photochemical Hydroxylation of Benzene Derivatives by the Singlet Excited State of 2,3-Dichloro-5,6-dicyano-p-benzoquinone Acting as a Super Oxidant

2014 ◽  
Vol 21 (7) ◽  
pp. 2855-2861 ◽  
Author(s):  
Kei Ohkubo ◽  
Kensaku Hirose ◽  
Shunichi Fukuzumi
Keyword(s):  
Excited State ◽  
Solvent Free ◽  
Singlet Excited State ◽  
Benzene Derivatives ◽  
Hydroxylation Of Benzene ◽  
One Step

One-step, ultrasonication-mobilized, solvent-free extraction/synthesis of nanocurcumin from turmeric

RSC Advances ◽  
2015 ◽  
Vol 5 (60) ◽  
pp. 48391-48398 ◽  
Author(s):  
Judy Gopal ◽  
Manikandan Muthu ◽  
Se-Chul Chun
Keyword(s):  
Solvent Free ◽  
Water Soluble ◽  
One Step

One step ultrasonication for direct recovery of water soluble nanocurcumin from turmeric.

Amino derivatives of symmetric 1,3,5-triphenylbenzene. Nature of the polar singlet excited state.

1993 ◽  
Vol 176 (1) ◽  
pp. 195-213 ◽  
Author(s):  
G. Verbeek ◽  
S. Depaemelaere ◽  
M. Van der Auweraer ◽  
F.C. De Schryver ◽  
A. Vaes ◽  
...  
Keyword(s):  
Excited State ◽  
Singlet Excited State ◽  
Amino Derivatives ◽  
Derivatives Of

Thionine–graphene oxide covalent hybrid and its interaction with light

2017 ◽  
Vol 19 (22) ◽  
pp. 14412-14423 ◽  
Author(s):  
Ewelina Krzyszkowska ◽  
Justyna Walkowiak-Kulikowska ◽  
Sven Stienen ◽  
Aleksandra Wojcik
Keyword(s):  
Electron Transfer ◽  
Graphene Oxide ◽  
Excited State ◽  
Transfer Process ◽  
Singlet Excited State ◽  
Functionalized Graphene ◽  
Electron Transfer Process ◽  
Functionalized Graphene Oxide ◽  
Back Electron Transfer

Quenching of the thionine singlet excited state in covalently functionalized graphene oxide with an efficient back electron transfer process.

An Efficient Method for Synthesis of 4-(Phosphonomethyl)benzene Derivatives under Solvent-Free Conditions.

ChemInform ◽  
2004 ◽  
Vol 35 (32) ◽  
Author(s):  
Ting Yang ◽  
Changxue Lin ◽  
Hua Fu ◽  
Yuyang Jiang ◽  
Yufen Zhao
Keyword(s):  
Efficient Method ◽  
Solvent Free ◽  
Benzene Derivatives ◽  
Solvent Free Conditions

The photocycloaddition of dibenzoylmethanatoboron difluoride (DBMBF2) with conjugated enones and en-esters

1993 ◽  
Vol 71 (6) ◽  
pp. 846-854 ◽  
Author(s):  
Yuan L. Chow ◽  
Shi-Sen Wang ◽  
Xian-En Cheng
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Ring Opening ◽  
Electron Donors ◽  
Head Orientation ◽  
Singlet Excited State ◽  
Methyl Substitution ◽  
Unsaturated Ketones ◽  
Dibenzoylmethanatoboron Difluoride

Dibenzoylmethanatoboron difluoride (DBMBF2), the BF2 complex of dibenzoylmethane, reacted from its singlet excited state with α,β-unsaturated ketones and esters to give 1,5-diketones by a [2+2] cycloaddition and ring-opening sequence in an analogous pathway to that observed in the photocycloaddition to olefins and dienes. The present photoreaction is unexpected since conjugated enones and en-esters are poor electron donors to comply with the previously proposed charge transfer requirement in DBMBF2 photoreactions. The photocycloaddition to these substrates was highly regioselective and stereoselective, giving the head-to-head orientation, which could be enhanced by α-methyl substitution; β-methyl substitution increased the alternate head-to-tail orientation. The photolysis of a mixture of DBMBF2 and a cyclic enone also caused the latter to dimerize to give head-to-head and head-to-tail dimers in significant yields. These photodimerizations were apparently caused by DBMBF2 sensitization. The mechanism of the sensitization is discussed.

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