3307-35-5Relevant articles and documents
Novel convenient method for the synthesis of N,N- bis(trimethylsilyloxy)enamines
Dilman,Tishkov,Lyapkalo,Ioffe,Strelenko,Tartakovsky
, p. 181 - 185 (2007/10/03)
Both primary and secondary aliphatic nitro compounds 1 were found to react with two equivalents of bromotrimethylsilane in the presence of triethylamine followed by aqueous workup to give appropriate N,N- bis(trimethylsilyloxy)enamines 3 in good isolated yields. Products 3, starting from some secondary and/or sterically hindered compounds 1, are synthesized from the corresponding silyl nitronates 2.
Kinetics and Mechanism of the Alkaline Release of Phenyl(mercapto)tetrazoles from α-Oximes
Boggs, Roger A.,Hasan, Fariza B.,Mahoney, J. Barry,Mehta, Avi C.,Palumbo, Catherine M. K.,et al.
, p. 1271 - 1277 (2007/10/02)
Compounds such as α-phenyl(mercapto)tetrazole (PMT) oxime (9) undergo rapid elimination of the PMT anion in base via a nitrosoene intermediate.Solution kinetics and HPLC analysis of reaction products are consistent with the mechanism shown in Scheme 2.For open chain oximes such as 4, substitution α to the oxime increases the rate of release of PMT and is attributed to the relief of strain when a crowded reactant is converted to a less-crowded product.For cyclic oximes, the six-membered ring compounds are more reactive than the corresponding five-membered compounds.A linear isokinetic relationship between the entropy and enthalpy of activation was found with β = 346 +/- 51 K.Entropies of activation were found to range from -7 to +24 c.u. (1 c.u. = 4.184 J mol-1 K-1) and support the proposed mechanism.
