Exciplex-based fluorescence thermometers have been developed which should allow the nonintrusive realtime determination of temperatures in hydrocarbon liquids within 1 degrees C at temperatures as high as 400 degrees C. The two-candidate dopant molecules-1,3-bis-(1'-pyrenyl)-propane and 3-(4'-dimethylaminophenyl)-1-(1'- pyrenyl)-propane-are commercially available and may be used at concentrations as low as 1 ppm.
mA (current density: 1.6 A/dm2). After 8.0 F/mol of electricity was passed, the reaction mixture was poured into 100 mL of a saturated sodium chloride solution and extracted with three 50-mL portions of ether. The combined ethereal solution was dried over anhydrous magnesium sulfate, filtered, and concentrated to give an oily material, which was then fractionally distilled to form almost pure 2-methyl-4-methoxyphenol (8) in 42% yield; mp 71-72 °C [lit.28 mp 71-72 °C].
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