In agreement with predictions by the molecular orbital theory (LONGUET‐HIGGINS) 2‐amino‐diphenylene reacts with benzenediazonium ions in 3‐position.
Allgemeine Basenkatalyse der Orientierung bei Resorcin-Kupplungen. 14. Mitteilung zur Kenntnis der Kupplungsreaktion
✍ Scribed by H. F. Hodson; O. A. Stamm; Hch. Zollinger
- Publisher
- John Wiley and Sons
- Year
- 1958
- Tongue
- German
- Weight
- 468 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0018-019X
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
Diazo coupling of 4‐phenylazo‐resorcinol takes place in 2‐ or 6‐position, depending on the acidity of the medium. It is shown that this orientation phenomenon is not caused by hydroxyl ion catalysis, but by general base catalysis.
It is probable that the diazo orientation in resorcinol and in m‐phenylenediamine is to be explained on the same mechanistic basis as the orientation in α‐naphthol coupling reactions.
📜 SIMILAR VOLUMES
## Abstract 1. The catalytic effect of pyridine, of the three isomeric picolines and of 2,6‐lutidine on the coupling rate of 4‐chloro‐diazobenzene with 2‐naphthol‐6,8‐disulphonic acid has been measured.
## Abstract This is a preliminary communication on azo couplings in sulphuric acid solution of high concentration. The reaction of the undissociated naphthol which is not measurable in aqueous solution of low acidity (because of the predominant naphtholate coupling) can be demonstrated in sulphuric
## Abstract 1. Diazo couplings of 4‐chlorodiazobenzene with [2:4‐di‐D]‐1‐naphtol‐3‐sulphonic acid show an isotope effect (k~H~/K~D~ = 3·1) which is smaller than the isotope effect of the analogous reaction with 2‐naphtol‐6:8‐disulphonic acid. These differencies are explained as a function of k~−1~,
## Abstract 1. The reaction rates of five azo couplings of substituted diazo‐benzenes with 2,6‐ and with 1,4‐naphtholsulphonie acid are measured at ionic strengths between 0,005 and 0,25.