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
Electrochemical strategies for <i>N</i>-cyanation of secondary amines and α <i>C</i>-cyanation of tertiary amines under transition metal-free conditions
作者:Zhengjiang Fu、Yaping Fu、Jian Yin、Guangguo Hao、Xuezheng Yi、Tingting Zhong、Shengmei Guo、Hu Cai
DOI:10.1039/d1gc02529e
日期:——
Transition metal-free electrochemical approaches for the N-cyanation of secondaryamines and the α C-cyanation of tertiaryamines have been well established, with products being obtained in moderate to good yields and with good functional group tolerance under ambient conditions. The synthetic application of the protocols has been highlighted through scale-up experiments in a galvanostatic mode. Preliminary
Copper-promoted N-cyanation of aliphatic sec-amine by CuCN is achieved via oxidative coupling. This procedure employs O2 as a clean oxidant. Notably, sulfoximines and 1,1,3,3-tetramethylguanidine also worked well in this procedure. Thus, it represents a key progress in the C–N bond formation reaction as well as in the cyanation reaction.
The Reaction of Cyanamidium Salts with Ylidenecyanamide Derivatives
作者:Rajab Abu-El-Halawa、Sami A. Zabin、Mahmoud Al-Refai、Mohammad Ibrahim、Tawfeq Kaimari、Thomas J. J. Müller
DOI:10.5560/znb.2014-4086
日期:2014.7.1
with ylidenecyanamide derivatives 5to afford conjugated iminium salts 12. The N,N,Nʹ-trialkylcyanamidium salts 1react as the ene, and the ylidenecyanamide derivatives 5react as the enophile components to form the 2-azoniaallene salts 11 followed by the formation of conjugated iminium salts 12 as cationic polynitrogen compounds with guanidine and amidine subgroups. The constitution of the new conjugated
Reaktionen von carben-komplexen mit tetramethylcyanoguanidin
作者:Helmut Fischer、Friedrich Seitz、Gerhard Müller
DOI:10.1016/s0022-328x(00)98975-7
日期:1987.2
Tetramethylcyanoguanidine, NCNC(NMe2)2, reacts with pentacarbonyl-[methoxy(phenyl)carbene]chromium, (CO)5Cr[C(Ph)OMe], via substitution of the carbene ligand to give pentacarbonyl(tetramethylcyanoguanidine)chromium. X-ray structure analysis shows that the CrNCN fragment is nearly linear in the crystal, and that the CNC angle is 122.9(1)°. In solution rapid syn-anti isomerization at the NC double