90255-51-9

Upstream product

• 591-51-5 phenyllithium 
• 149457-51-2 2-Phenyl-1-(2,4,6-tri-tert-butyl-phenyl)-1H-phosphindole 
• 4073-31-8 (diethylamino)phenylchlorophosphine 
• 1034024-43-5 1,2-diphenylbenzo[b]phosphole-P-oxide 
• 1034024-51-5 phenyl-(2-phenylethynylphenyl)phosphine 
• 149457-47-6 (2-(phenylethynyl)phenyl)(2,4,6-tri-tert-butylphenyl)phosphine 
• 54737-45-0 (E)-2-bromostilbene 
• 90255-53-1 C₂₀H₁₄ClP 
• 21375-88-2 1-bromo-2-(phenylethenyl)benzene 
• 54737-46-1 2,α,α'-tribromo-bibenzyl 

Relevant academic research and scientific papers

Effects of counter anions,: P -substituents, and solvents on optical and photophysical properties of 2-phenylbenzo [b] phospholium salts

In this work, we investigated the effects of counter anions, P-substituents, and solvents on the optical and photophysical properties of 2-phenylbenzo[b]phospholium salts in solution. A series of 2-phenylbenzo[b]phospholium salts was prepared by P-alkylation or P-phenylation of 1,2-diphenylbenzo[b]phosphole followed by anion exchange reactions. X-ray crystallographic analyses of six benzo[b]phospholium salts showed that each phosphorus center has an onium nature with an essentially tetrahedral geometry. 1H NMR and steady-state UV-vis absorption and fluorescence spectroscopic measurements of these phospholium salts revealed the pivotal role of counter-anion solvation. The observed results are discussed on the basis of the association-dissociation equilibrium between a contact ion pair (CIP) and a solvent-separated ion pair (SSIP) in solution. The hexafluorophosphates exist as SSIPs and emit intense fluorescence, irrespective of the P-substituents and solvents. In contrast, the iodides are present as SSIPs in methanol but exist as equilibrium mixtures of the two emitting species, SSIP and CIP, in dichloromethane. As a consequence, fluorescence intensities of the iodides varied significantly depending on the solvents, P-substituents, and solution concentrations. These findings were studied in more detail using time-resolved fluorescence spectroscopy and fluorescence titration measurements. The light-emitting properties of the 2-phenylbenzo[b]phospholium halides in the CIPs rely on heavy atom effects derived from the counter halide anions on the S1 state of the adjacent cationic benzo[b]phosphole π-systems. The present study suggests that 2-arylbenzo[b]phospholium salts would be promising scaffolds for developing new phosphole-based ionic fluorophores that are capable of responding to external stimuli such as anionic species and solvents.

Base-mediated cyclization reaction of 2-alkynylphenylphosphine oxides: Synthesis and photophysical properties of benzo[b]phosphole oxides

(Chemical Equation Presented) The base-mediated intramolecular cyclization reaction of 2-alkynylphenylphosphine oxides affords benzo[b]phosphole oxides, which show intense blue-green fluorescence. Benzo[b]phospholes are also prepared by the reduction of b

A general and simple synthesis of phosphindoles

A first simple and general synthesis of phosphindoles by intramolecular cyclisation of secondary o-phosphinotolanes is described.

Synthesis of Triphenylphosphane-en-ynes and Phosphindoles as well as X-Ray Analyses of two Phosphindoles

By means of aminochlorophenylphosphanes triphenylphosphanes are prepared, in which the o-positions are optionally substituted by trans-phenylethenyl and phenylethinyl groups (4a - c and 5a - c).Surprisingly, the intermediate chlorophosphanes 3a and c can