Supramolecular Photocatalysis by Utilizing the Host–Guest Charge‐Transfer Interaction: Visible‐Light‐Induced Generation of Triplet Anthracenes for [4+2] Cycloaddition Reactions
boronic ester [2+2]BTH-F containing highly electron-deficient difluorobenzothiadiazole moieties. In the presence of a catalytic amount of [2+2]BTH-F , the triplet excited state of anthracene was generated from the charge-transfer excited state of anthracene@[2+2]BTH-F by visible-light irradiation, and cycloaddition of the excited anthracene with several dienes and alkenes proceeded in a [4+2] manner in
Sulfonic acid esters derived from 1,1′-binaphthalene as new axially chiral photosensitizers
作者:Martin Vondenhof、Jochen Mattay
DOI:10.1016/s0040-4039(00)94409-5
日期:——
The preparation of four new 1,1′-binaphthalene derivatives and their scope as photochemical sensitizers for energy and electron transfer processes is described.
描述了四种新的1,1'-联萘衍生物的制备及其作为能量和电子转移过程的光化学敏化剂的范围。
The photosensitized dimerization of 1,3-cyclohexadiene
作者:Mariella Mella、Elisa Fasani、Angelo Albini
DOI:10.1016/s0040-4020(01)96040-5
日期:1991.5
scheme based on two reactive intermediates, the exciplex and the radical ion (not the freeradical ions) is proposed. The two species are in equilibrium and this causes the observed complex dependence of reaction quantum yield and product ratio on diene concentration. Intersystem crossing from the radical ion pair is the origin of a significant part of triplet 2+2dimerization.
Zeolite-based heterogeneous photosensitizers containing triphenylpyrylium and dibenzotropylium cations. Modifications of the product selectivity in the cyclodimerization of 1,3-cyclohexadiene
作者:Vicente Fornés、Hermenegildo García、Miguel A. Miranda、Fatemeh Mojarrad、María-José Sabater、Nadia N.E. Suliman
DOI:10.1016/s0040-4020(96)00343-2
日期:1996.5
system. As in solution, the endo [4+2] adduct was the major product. When a La-exchanged Y zeolite containing TP+ was used, the degree of conversion was even lower. This suggests that CHD cyclodimerization must occur via electron transfer to singlet TP+. In the case of DT+ within ZSM-5, the selectivity was reversed with respect to TP+: the major product was the anti [2+2] dimer. This was attributed to