Nachweis innermolekularer beweglichkeit durch NMR-spektroskopie—XV
作者:H. Kessler、D. Leibfritz
DOI:10.1016/s0040-4020(01)92757-7
日期:1970.1
The influence of substituents Z on the rates of syn-anti-isomerization has been studied using guanidines as typical examples of imines X2C = NZ. In the series: quinone imine < ketimime < C-aryl-imin < iminocarbonate < iminodithiocarbonate < guanidine the isomerization rate increases. The inversion mechanism was also proved by variation of Z. The inversion in imines is easier in the series: Z = OCH3
已经使用胍作为亚胺X 2 C = NZ的典型实例研究了取代基Z对顺-反异构化速率的影响。系列中:醌亚胺<酮亚胺
Synthesis of Some of New Substituted 2-(Phenyl)-1,3-dimethyl- and -1,1,3,3-tetramethylguanidines
A series of new 2-(phenyl)-1,3- and 2-(phenyl)-1,3,3-tetramethylguanidines ( a-k ) were synthesized by reaction of different substituted aniline and urea derivatives in the presence of phosphorus oxychloride. The yields of products following extraction from toluene without further purification were of the order of 50-70%. We have found that adjusting of the pH at 8-9 in the work up process increases