Novel photosensitizers for the E/Z-isomerization of trienes. Part 1. Syntheses and application
摘要:
Uranine and its thioxanthene and selenoxanthene analogues, as well as the disodium salts of o-(6-hydroxy-3-oxo-3H-xanthen-9-yl)benzenesulphonic acid and its thioxanthene and selenoxanthene analogues, show different photosensitizer properties in the E/Z-isomerization of trienes. This has been verified by applying them to the technically useful conversion of tachysterol into previtamin D. The syntheses of the novel photosensitizers with thioxanthene and selenoxanthene moieties are also described.
single‐step synthesis of aryl thiols from arylhalides has been developed employing copper(II) catalyst and 1,2‐ethanedithiol. The key features are use of readily available reagents, a simple operation, and relatively mild reaction conditions. This new protocol shows a broad substrate scope with excellent functional group compatibility. A variety of aryl thiols are directly prepared from arylhalides in high
LiI/TBHP Mediated Oxidative Cross-Coupling of P(O)-H Compounds with Phenols and Various Nucleophiles: Direct Access to the Synthesis of Organophosphates
Direct phosphorylation of P(O)–H compounds with various nucleophiles such as phenols, alcohols, amines and enols is described using oxidative cross‐coupling strategy. The phosphorylation of hydroxylated naphthyls and heteroarenes has been achieved. Main features of this transformation are short reaction time, functional group tolerance, and broad substrate scope.
Efficient Copper(I)-Catalyzed S-Arylation of KSCN with Aryl Halides in PEG-400
作者:Xiaokang Li、Tangjun Yuan、Junmin Chen
DOI:10.1002/cjoc.201100209
日期:2012.3
A simple and efficient protocol for CuI‐catalyzed CS bond formation of arylhalides with KSCN to symmetrical diaryl sulfides was reported in PEG‐400 without any other additives. A variety of arylhalides were converted to the corresponding diaryl sulfides in good to excellent yields. The present procedure tolerated a variety of functional groups and the steric hindrance of ortho‐substituents on aryl
and highly efficient protocol for the synthesis of symmetrical aryl sulfides was developed by the cross-coupling of aromatic halides with inexpensive and commercially available thiourea which was used as an effective sulfur surrogate. The present cross-coupling protocol of thiourea, via cascade reaction with various substituted arylhalides, producing desired aryl sulfides, has an added advantage of
ANALYTE DETECTION USING NEAR-INFRARED FLUOROPHORES
申请人:Portland State University
公开号:US20160223558A1
公开(公告)日:2016-08-04
Embodiments of compounds for selectively detecting an analyte are disclosed, along with methods and kits for detecting analytes with the compounds. The compounds are bridged viologen conjugates including at least one fluorophore according to the general structure
At least one of R
1
/R
2
, R
2
/R
3
, R
3
/R
4
, R
5
/R
6
, R
6
/R
7
, and/or R
7
/R
8
together form a substituted or unsubstituted cycloalkyl or aryl.