Preparation of N,N′-bis(aryl)guanidines from electron deficient amines via masked carbodiimides
作者:Mark R. Barvian、H.D. Hollis Showalter、Annette M. Doherty
DOI:10.1016/s0040-4039(97)01598-0
日期:1997.9
Preparation of N,N′-bis(aryl)guanidines by alkylation of electron deficient amines with trityl protected carbodiimides is described. Also reported is a method for the dehydration of N-trityl-N′-aryl ureas to the corresponding carbodiimides using the Burgess reagent.
A kinetic study of the rearrangement of triarylacetonitrile oxides
作者:Leslie W. Gibbs、Donald K. Wedegaertner
DOI:10.1021/jo00026a024
日期:1991.12
The thermal rearrangement of triphenylacetonitrile oxide (1a) to triphenylmethyl isocyanate (2) is a first-order process. Rate constants at five temperatures between 116 and 190-degrees-C were determined giving DELTA-H double-ended dagger = 9.3 +/- 1.1 kcal/mol and DELTA-S double-ended dagger = -58.2 +/- 2.4 cal/mol.K. The rearrangement of substituted triarylacetonitrile oxides (1b-d) occur only slightly faster than that of 1a. These results are interpreted in terms of a concerted single-step rearrangement in which the highly ordered transition state (6c) has a degree of radical character.
Jones; Hurd, Journal of the American Chemical Society, 1921, vol. 43, p. 2433
作者:Jones、Hurd
DOI:——
日期:——
Bredereck; Reif, Chemische Berichte, 1948, vol. 81, p. 426,429,433
作者:Bredereck、Reif
DOI:——
日期:——
v. Meyer; Fischer,P., Journal fur praktische Chemie (Leipzig 1954), 1910, vol. <2> 82, p. 522