Iodine-mediated construction of polyfunctionalized arylazopyrazoles from β-ketoesters or 2-arylpyrazol-3-ones and arylhydrazines
作者:Rameshwar Prasad Pandit、Sung Hong Kim、Yong Rok Lee
DOI:10.1039/c6ob01158f
日期:——
An iodine-promoted synthetic protocol for the construction of functionalized arylazopyrazoles was developed starting from β-ketoesters or 2-arylpyrazol-3-ones and arylhydrazines in the presence of silver catalysts.
申请人:Industry Academic Cooperation Foundation of Yeungnam University 영남대학교 산학협력단(220040363026) BRN ▼515-82-06574
公开号:KR20180003667A
公开(公告)日:2018-01-10
본 발명은 아조피라졸 화합물 및 은 촉매 반응을 이용한 이의 신규한 합성방법에 관한 것으로, 보다 상세하게는 α-디아조-β-케토에스터와 아릴하이드라진의 은 (Ag) 촉매 반응을 이용한 원-팟(one-pot) 합성방법은 다원적 기능을 갖는 다양한 아조피라졸을 효율적으로 합성할 수 있는 장점이 있으며, 상기 합성과정에 의해 합성된 아조피라졸은 천연물 합성, 의약제 또는 염료 산업 등에 널리 사용될 수 있다.
Ozonolysis of 3-Methyl-1-phenyl-4-phenylazo-5-pyrazolone
作者:Masaki Matsui、Akihiro Konda、Katsuyoshi Shibata
DOI:10.1246/bcsj.58.2829
日期:1985.10
In chlorinated solvents, 3-methyl-1-phenyl-4-phenylazo-5-pyrazolone (1) easily reacts with ozone to give benzene (2), phenol (3), chlorobenzene (4), o-chlorophenol (5), biphenyl (6), and 3-methyl-1-phenyl-2-pyrazoline-4,5-dione (7). The formation of these products is explained by an electrophilic ozone attack on the hydrazone tautomer 1′.
Standard samples and methods of instrumental measurement of saybolt color of petroleum products using said samples
申请人:NIPPON PETROLEUM REFINING COMPANY, Ltd.
公开号:EP0473114A2
公开(公告)日:1992-03-04
A standard sample for use in an instrumental measurement of Saybolt color of a petroleum product with a photoelectric colorimeter, which comprises a mixed solution of 1-(phenylazo)-2-naphthalenol, 3-methyl-1-phenyl-4-(phenylazo)-pyrazol-5-ol and 1,4-bis(butylamino)-9,10-anthracenedione each as a colorant, 1-phenyl-1-xylylethane as a solvent for said colorants and dodecene as a diluent, and a method of instrumental measurement of Saybolt color of a petroleum product, which comprises calibrating a photoelectric colorimeter with the standard sample.
Standard samples and methods of instrumental measurement of ASTM color of petroleum products using said samples
申请人:NIPPON PETROLEUM REFINING COMPANY, Ltd.
公开号:EP0481519A1
公开(公告)日:1992-04-22
A standard sample for use in an instrumental measurement of ASTM color of a petroleum product with a photoelectric colorimeter, which comprises a mixed solution 3-methyl-I-phenyl-4-(phenylazo)-pyrazol-5-ol, 1-(phenylazo)-2-naphthalenol, 1-[[4-[(dimethylphenyl)azo]dimethylphenyl]azo]-2-naphthalenol, 1,5(or 1,8)-bis[(4-methylphenyl)amino]-9,10-anthracenedione, 1-hydroxy-4-[(4-methylphenyl)amino]-9,10-anthracenedione, 1,4-bis-(butylamino)-9,10-anthracenedione and 1,4-bis[(4-butylphenyl)amino]-5,8-dihydroxy-9,10-anthracenedione each as a colorant, 1-phenyl-1-xylylethane as a solvent for said colorants and dodecane as a diluent, and a method of instrumental measurement of ASTM color with the standard sample.