2,6-Diphenyl-4H-chalcogenopyran-4-ones and 2,6-diphenyl-4H-chalcogenopyran-4-thiones: a new catalyst for the Baylis-Hillman reaction
摘要:
2,6-Diphenyl-4H-chalcogenopyran-4-ones and 2,6-diphenyl-4H-chalcogenopyran-4-thione a new series of catalysts for the Baylis-Hillman reaction, were investigated. The reactions proceeded smoothly in the presence of 1 mol eq. of TiCl4 under atmospheric pressure at 0 degrees C, giving adducts in moderate to high yields. Chalcogenopyranones and chalcogenopyranthiones were a more efficient kind of catalyst than Me2S. (C) 1999 Elsevier Science Ltd. All rights reserved.
[EN] CHALCOGENOPYRYLIUM DYES, COMPOSITIONS COMPRISING SAME, COMPOSITE NANOPARTICLES COMPRISING SAME, AND METHODS OF MAKING AND USING THE SAME<br/>[FR] COLORANTS À BASE DE CHALCOGÉNOPYRYLIUM, COMPOSITIONS LES COMPRENANT, NANOPARTICULES COMPOSITES LES COMPRENANT, PROCÉDÉS DE FABRICATION ET D'UTILISATION ASSOCIÉS
申请人:RES FOUNDATION FOR THE STATE UNIVERSITY OF NEW YORK UNIVERSITY AT BUFFALO
公开号:WO2016081813A1
公开(公告)日:2016-05-26
The present disclosure provides chalcogenopyrylium compounds, composite nanostructures comprising the chalcogenopyrylium compounds, and methods of using the compounds and/or composite nanostructures. For example, composite nanostructures comprising the chalcogenopyrylium compounds are used in imaging applications. The present disclosure provides chalcogenopyrylium compounds having the following structure where each E is, at each occurrence in the compound, independently charged or neutral and is independently selected from S, Se, 0, or Te, wherein at least one E is S or Se; each R1 is, at each occurrence in the compound, independently selected from the group consisting of -H, Ci-s alkyl group, halo group, -CN, aryl group, and heteroaryl group and adjacent R1 groups can combine to form C5ss aryl groups, each R2 is, at each occurrence in the compound.
A novel reaction of 2,4,6-triphenyl(thio)selenopyrylium salts leading to benzoyl(thio)selenophenes and 2,4,6-triphenyl(thio)selenopyrans
作者:B. I. Drevko、E. G. Bol’shakova、A. F. Almaeva、M. A. Suchkov、V. G. Mandych、G. A. Shekhter
DOI:10.1007/s11172-009-0207-z
日期:2009.7
Thio- and selenopyrylium salts undergo simultaneous oxidation, leading to the corresponding benzoylselenophene or benzoylthiophene, and reduction reactionsleading to 4H-selenopyran or 4H-thiopyran In the presence of water and triethylamine.
Shining Light on the Solution- and Excited-State Dynamics of Chalcogenopyrylium Polymethine Dyes
作者:Lauren E. Rosch、Matthew R. Crawley、Ryan M. O’Donnell、Thomas N. Rohrabaugh、Trenton R. Ensley、Thomas A. Sobiech、Timothy R. Cook
DOI:10.1021/acs.organomet.2c00263
日期:2022.8.22
singlet oxygen yields as high as 12% for certain dyes, we observe no evidence for 1O2 from direct phosphorescence measurements. We now fill in many of these gaps through steady-state and pulsed-laser kinetic experiments on a family of 14 dyes, including six novel dyes, selected to vary physical and electronic structure. These structural changes encompass the selenium and tellurium heteroatoms, phenyl,
尽管 40 年来人们对硫属吡喃多甲炔染料感兴趣,但我们对其光物理特性的理解仍存在重大差距。这些差距阻碍了将这些染料应用为光动力疗法和/或生物医学传感剂的努力,其中完全了解它们的激发态动力学和化学是很重要的。例如,尽管先前的报道确定某些染料的单线态氧产量高达 12%,但我们没有观察到1 O 2的证据来自直接磷光测量。我们现在通过对 14 种染料家族(包括六种新型染料)进行稳态和脉冲激光动力学实验来填补这些空白,这些染料被选为改变物理和电子结构。这些结构变化包括硒和碲杂原子、苯基、噻吩、叔-丁基取代基和次甲基接头长度。通过飞秒瞬态吸收光谱获得激发态寿命。寿命都低于 300 ps,这表明它们的激发态会快速弛豫。值得注意的是,我们没有观察到任何三重态瞬态过程的证据。磷光仅在 77 K 的样品中观察到。变温 NMR 实验表明,吡喃环围绕次甲基骨架的旋转是这些染料动力学的关键决定因素,从而将它们的光物