28490-57-5Relevant articles and documents
Acid-Catalyzed Photochemical Generation of Benzyl Cations as a Probe of the Electron-Donating Abilities of Benzene Substituens in the Singlet Excited State
Wan, Peter
, p. 2583 - 2586 (1985)
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SUBSTITUTED CONDENSED THIOPHENES AS MODULATORS OF STING
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Page/Page column 115, (2019/12/04)
A compound of formula (I), wherein: R1 is selected from (i) H, (ii) C3-6cycloalkyl, (iii) C3-7heterocyclyl optionally substituted with a group selected from: methyl and ester, and (iv) linear or branched C1-4alkyl optionally substituted with a group selected from: alkoxy, amino, amido, acylamido, acyloxy, alkyl carboxyl ester, alkyl carbamoyl, alkyl carbamoyl ester, phenyl, phosphonate ester, C3-7heterocyclyl optionally substituted with a group selected from methyl and oxo, and a naturally occurring amino acid, optionally N-substituted with a group selected from methyl, acetyl and boc; A1 is CRA or N; A2 is CRB or N; A3 is CRC or N; A4 is CRD or N; where no more than two of A1, A2, A3, and A4 may be N; one or two of RA, RB, RC, and RD, (if present) are selected from H, F, Cl, Br, Me, CF3, cyclopropyl, cyano, OMe, OEt, CH2OH, CH2OMe and CH2NMe2; the remainder of RA, RB, RC, and RD, (if present) are H; Y is O, NH or CH2; RY is selected from: (RYA) and (RYB).
Correlation of the rates of solvolysis of (arylmethyl)methylphenyl-sulfonium ions
Kevill, Dennis N.,Ismail, Norsaadah H.J.
, p. 1865 - 1868 (2007/10/03)
The specific rates of solvolysis of the benzylmethylphenylsulfonium ion (prepared as the trifluoromethanesulfonate salt) and five benzylic ring-substituted derivatives can be satisfactorily correlated using NT solvent nucleophilicity values. Addition of a secondary term, governed by the aromatic ring parameter (I), shows the sensitivities towards changes in this parameter to fall and those towards changes in NT to rise with increasing electron-withdrawing ability of the substituent. The Hammett ρ values with electron-withdrawing substituents (based on ρ+ values) vary from -0.9 in 95% acetone to -1.8 in 97% 2,2,2-trifluoroethanol. These Grunwald-Winstein and Hammett analyses are compared to those previously reported, with essentially the same solvents and substituents, for solvolyses of arylmethyl p-toluenesulfonates.