中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 2-cyano-2-valproic acid | 66546-91-6 | C9H15NO2 | 169.224 |
—— | 2-aminomethyl-2-propyl-valeric acid ethyl ester | 100535-65-7 | C11H23NO2 | 201.309 |
2-丙基戊酸乙酯 | ethyl 2-propylpentanoate | 17022-31-0 | C10H20O2 | 172.268 |
二丙基丙二酸二乙酯 | 2,2-dipropyl-malonic acid diethyl ester | 6065-63-0 | C13H24O4 | 244.331 |
4-Mono- and 4,4-disubstituted-3-imino-2-benzoyl-5-pyrazolones have been prepared from the corresponding ethyl mono- or disubstituted cyanoacetates and N-benzoylhydrazine. The presence of the imino group in 4,4-disubstituted-3-imino-2-benzoyl-5-pyrazolones was ascertained by the hydrolysis of 4,4-dibenzyl-3-imino-2-benzoyl-5-pyrazolone into 4,4-dibenzyl-3-oxo-2-benzoyl-5-pyrazolone. In order to prove that the benzoyl group in these pyrazolones was not in Position 1, the synthesis of 4-benzyl-3-amino-1-benzoyl-5-pyrazolone was attempted from 4-benzyl-3-carbethoxy-1-benzoyl-5-pyrazolone through a Curtius degradation of the 3-carbethoxy substituent into a 3-amino group. It was found that the 1-benzoyl group was hydrolyzed at the same time as the 3-carbethoxyamino substituent. The ultraviolet absorption spectra of all these compounds are reported and discussed briefly.
Thirteen 3-amino-5-pyrazolones substituted only in position 4 have been synthesized from the corresponding mono- or disubstituted cyanoacethydrazides or cyanoacetic esters in alkaline medium. Their ultraviolet light absorption spectra have been determined in neutral and acid solutions.