Cyclization of the Enol Esters of o-Acyloxyphenyl Alkyl Ketones, IV. A kinetic study of the steps of the KOSTANECKI-ROBINSON reaction
✍ Scribed by T. Széll; K. Kovács; M. S. Zarándy; Á. Erdőhelyi
- Publisher
- John Wiley and Sons
- Year
- 1969
- Tongue
- German
- Weight
- 332 KB
- Volume
- 52
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
I n Part 1 1 1 I atid I1 12.; of this serics WI. reported the c:yclization o f o-acyloxuyphenyl alkyl ketoncs into cI~ronion(~s in the presence of bases, in either aqucous or non-aqueous media. In Part 111 [3] it lias been shown that the K ~S . ~. A N E C K I -~~~K I N S ~N reaction leading to clironioncs and isoflavones involves the cyclization of enol esters. l) This paper is respectfully dedicated to the memory of ST. VON KOSTANECKI, the famous professor of the University of Bern, for the 60th anniversary of his death. *) Ruf Engliscli verof fcntlicht gemiiss besondcrein Bcschluss des Rcdaktionskomitccs.
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T h e flash photolysis of azo-n-propane and of azoisopropane has been studied by kinetic spectroscopy. Transient absorption spectra in the region of 220-260 nm have been assigned to the n-propyl and isopropyl radicals. For the n-propyl radical, cmax = 744 f 39 limo1 cm a t 245 nm and the rate consta