S-Benzylthiuronium Salts of Sulfobenzoic Acids

Newer aspects of electron transfer in electrophilic Aromatic Nitration. Radical pairs as reactive intermediates by time‐resolved spectroscopy

“…Nitrosophenol can be isolated from interrupted special nitrations. 63 The product distribution strongly favors p-nitrophenol,-which suggests that this nitration proceeds via a nitrosation-oxidation pathway: Such a pathway is not applicable to less electron-rich substrates such as mesitylene or naphthalene, since they are nitrosated too slowly for equation (15) to apply. On the basis of kinetics and CIDNP (see below), Giffney and Ridd66 proposed the electron transfer mechanism shown in Scheme 3.…”

“…+ The formal addition of nitrating agents N02Y' to aromatic systems discussed in Section 5.3 can also be brought about in the course of CT activation. For example, anthracene reacts with tetranitromethane by addition of the elements of 02NC(N02)3 across the 9,lO positions [equation (63)]. 96 Naphthalenes react with both tetranitr~methane~'~'~''~~~ and nitropyridinium cations94*'61 to yield a mixture of 1 ,.l-adducts and nitronaphthalenes, e.g.…”

ChemInform Abstract: Substituent Constants of the Pyrazol, 1,2,3‐Triazol, Benzotriazol and Naphthotriazol Group

“…The synthesis of benzoic acids with the title substituents in p and m-position (15, 13,11,9) and their ethyl and methyl esters is described. The up and IT,,, values of the substituents obtained by alkaline hydrolysis of the esters in ethanollwater and methylcellosolve/water demonstrate an inductive electron withdrawing and a mesomer electron donating effect of these groups which are important for dye chemistry.…”

Estimation of Trace Amounts of Acetaldehyde in Vinyl Chloride

“…and macro quantities have been reported {1-7, [10][11][12][13]. Some of these procedures have been evaluated in terms of their usefulness in determining the aldehyde content of vinyl chloride.…”