The pKa values of nineteen phenyl hydrazinecarboxylate hydrochlorides R-C6H4OCONHNH2·HCl (R = H, 3- and 4-Cl, 3- and 4-O2N, 4-Me) and their 1-methyl or 2-methyl derivatives were determined by potentiometric titration with tetrabutylammonium hydroxide in DMSO. IR spectra of the hydrazinecarboxylates and their hydrochlorides revealed that the hydrazinecarboxylate protonation occurs at N2. The methods of synthesis of phenyl hydrazinecarboxylate and their N-methyl derivatives were optimized.
十九种苯基
肼羧酸盐盐酸盐R-C6H4OCONHNH2·HCl(R = H,3-和4-Cl,3-和4-O2N,4-Me)及其1-甲基或2-甲基衍
生物的pKa值通过在
DMSO中与四丁基
铵氢氧化物进行电位滴定确定。
肼羧酸盐及其盐酸盐的红外光谱表明
肼羧酸盐的质子化发生在N2处。苯基
肼羧酸盐及其N-甲基衍
生物的合成方法已经优化。