164654-82-4Relevant academic research and scientific papers
Polyalkyl hydroxyaromatic esters and fuel compositions containing the same
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, (2008/06/13)
Polyalkyl hydroxyaromatic esters having the formula: STR1 or a fuel-soluble salt thereof; where R1 and R2 are independently hydrogen, hydroxy, lower alkyl having 1 to 6 carbon atoms, or lower alkoxy having 1 to 6 carbon atoms; R3 is a polyalkyl group having a weight average molecular weight in the range of about 450 to 5,000; and x is an integer from 0 to 10. The polyalkyl hydroxyaromatic esters of formula I are useful as fuel additives for the prevention and control of engine deposits.
The Fries Rearrangement as an Equilibrium Reaction
Effenberger, Franz,Gutmann, Rainer
, p. 1089 - 1102 (2007/10/02)
The Fries rearrangement of arylbenzoates 1, in 1,2-dichloroethane in the presence of trifluoromethanesulfonic acid (TFMS) as catalyst, to ortho- and para-hydroxyaryl ketones (2 and 3, resp.) is reversible at 170 deg C; an equilibrium of the compounds 1, 2, and 3 is established.The equilibrium is achieved starting from the aryl esters 1 as well as from the hydroxyaryl ketones 2 and 3, respectively.The higher stability of the ortho-compounds 2 compared to the para-compounds 3 can be explained by greater resonance interaction between the carbonyl group and the aromatic ring in 2.The torsion angles Θ, which are good indicators of this interaction, can be determined from 13C NMR spectra.A dissociative mechanism is proposed for the acryl group migration.
