Carbon-phosphorus heterocycles. A one-step synthesis of phosphindolines and phosphinolines. Cyclization of diphenylalkenylphosphine oxides with polyphosphoric acid

1976 ◽  
Vol 41 (8) ◽  
pp. 1403-1407 ◽  
Author(s):  
M. El-Deek ◽  
G. D. Macdonell ◽  
S. D. Venkataramu ◽  
K. Darrell. Berlin
Keyword(s):  
Polyphosphoric Acid ◽  
One Step ◽  
Phosphorus Heterocycles

Chemistry of hydrofluorenones. II. Synthesis from cyclohexyl benzoates

1976 ◽  
Vol 29 (12) ◽  
pp. 2683 ◽  
Author(s):  
KSN Ng ◽  
JL Roberts ◽  
PS Rutledge ◽  
MA Wilson ◽  
PD Woodgate
Keyword(s):  
Polyphosphoric Acid ◽  
Shift Reagent ◽  
Paramagnetic Shift ◽  
One Step

Synthetically useful substituted hexahydrofluoren-9-ones and hexahydrobenzofluoren-11-ones may be prepared in one step from cyclohexyl benzoates or naphthoates and polyphosphoric acid. When the hydrindanone ring junctions are unsubstituted the stereochemistry may be determined from the 1H N.M.R. spectra by decoupling the spectra after addition of a paramagnetic shift reagent.

scholarly journals Synthesis of 2-(1-Benzofuran-2-yl)-4-(1,3-benzoxazol-2-yl/ 1,3-benzothiazol-2-yl) Quinolines as Blue Green Fluorescent Probes

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Yadav D. Bodke ◽  
Sheelavanth Shankerrao ◽  
Hosanagara N. Harishkumar
Keyword(s):  
Quantum Yield ◽  
Fluorescent Probes ◽  
Polyphosphoric Acid ◽  
Bathochromic Shift ◽  
Stokes Shift ◽  
Green Light ◽  
High Quantum Yield ◽  
Fluorescent Properties ◽  
One Step ◽  
Green Fluorescent

A series of novel 2-(1-benzofuran-2-yl)-4-(1,3 benzoxazol-2-yl/1,3-benzothiazol-2-yl) quinoline derivatives4(a–d)were synthesized in one step by the reaction of 2-(1-benzofuran-2-yl) quinoline-4-carboxylic acids3(a-b)with o-aminophenol and o-amino thiophenol, respectively, using polyphosphoric acid (PPA) as a cyclizing agent. The fluorescent properties of newly synthesized compounds were investigated in three different organic solvents like chloroform (CHCl3), tetrahydrofuran (THF), and dimethyl sulfoxide (DMSO). The photophysical constants such as quantum yield and stokes shift were determined. From the results of fluorescence study, it is evident that all synthesized compounds are fluorescent in solution. Compound4aemitted green light (490.4 nm, 518.2 nm, and 522.4 nm) with high quantum yield in all the three solvents, while compounds4b, 4c, and4demitted green light (512 nm, 499 nm, 510 nm) only in polar solvent DMSO. All fluorescent probes exhibited a bathochromic shift on increase in polarity of the solvent.

scholarly journals One-Step Methylation of Aromatic Phosphorus Heterocycles: Synthesis and Crystallographic Characterization of a 1-Methyl-Phosphininium Salt

2021 ◽  
Author(s):  
Lukas Fischer ◽  
Friedrich Wossidlo ◽  
Daniel Frost ◽  
Nathan Thomas Coles ◽  
Simon Steinhauer ◽  
...  
Keyword(s):  
Direct Synthesis ◽  
One Step ◽  
Phosphorus Heterocycles ◽  
First Time

For the first time the direct synthesis of 1-methyl-phosphininium salts has been achieved by reacting aromatic λ3,σ2-phosphinines with the readily available dimethyl chloronium salt [(CH3)2Cl]+[Al(OTeF5)4]-. The remarkably high electrophilicity of...

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