Showing papers on "Zeatin published in 1968"
TL;DR: Acid hydrolysis of samples of s-RNA containing IPA yields two degradation products of IPA, N6-(3-hydroxy-3-methylbutyl) adenine, II, which is a potent cytokinin and 3-H-7, 7-dimethyl-7-8,8,9-trihydropyrimido-[2,1-i] purine, III,Which is not biologically active.
25 citations
TL;DR: The 3-, 7-and 9-Monomethylderivative des Cytokinins Zeatin wurden hergestellt und ihre Aktivitat in der Karottenwurzel nachgewiesen as mentioned in this paper.
Abstract: Die 3-, 7- und 9-Monomethylderivative des Cytokinins Zeatin wurden hergestellt und ihre Aktivitat in der Karottenwurzel nachgewiesen. Die Ergebnisse zeigen, dass die Nukleotidderivative nicht not-wendige Stufen im Wirkungsmechanismus darstellen.
17 citations
TL;DR: A series of ω-hydroxypolymethyleneaminopurines synthesized were compared with those of kinetin and zeatin in the young wheat coleoptile, the wheat leaf senescence and tobacco pith tests, and the member of the series having the five carbon side-chain was the most active.
10 citations
3 citations
TL;DR: In this article, the diphosphorylation of 6-(4-hydroxy-3-methylbut-trans-2-enylamino)-9-(2′,3′-O-isopropylidene-β-D-ribofuranosyl) purine with 2-cyanoethyl phosphate and dicyclohexyl carbodi-imide in pyridine followed by removal of protecting groups gave 6-(3methyl-4-pyridiniobut-trans-(2-enyl]-polycyclic 2-
Abstract: Attempted diphosphorylation of 6-(4-hydroxy-3-methylbut-trans-2-enylamino)-9-(2′,3′-O-isopropylidene-β-D-ribofuranosyl) purine with 2-cyanoethyl phosphate and dicyclohexylcarbodi-imide in pyridine followed by removal of protecting groups gave 6-(3-methyl-4-pyridiniobut-trans-2-enylamino)-9-β-D-ribofuranosylpurine 5′-phosphate, which was hydrolysed by an alkaline phosphatase to the riboside and by acid to the aglycone. The latter compound was synthesised from zeatin and methanesulphonyl chloride in pyridine, and also by reaction of 6-(4-chloro-3-methylbut-trans-2-enylamino)purine, (prepared from zeatin and methanesulphonyl chloride in NN-dimethylformamide) or, less readily, O-p-tolylsulphonylzeatin (from zeatin and toluene-p-sulphonyl chloride) and pyridine. Structures assigned to the compounds were confirmed by u.v. absorption, 1H n.m.r., and mass spectroscopic studies. The related 3-carbamoyl-1-[2-methyl-4-(purin-6-ylamino)but-trans-2-enyl]pyridinium chloride was obtained in a similar manner and the quaternisation of pyridine by allyl alcohols including zeatin in the presence of 2-cyanoethyl phosphate and dicyclohexylcarbodi-imide was shown to be general.
2 citations
TL;DR: In this paper, the same preparation (6 months from the time of its production) was subjected to gel filtration carried out under analogous conditions, the first fraction which was homogeneous on electtophoresis in a starch gel, proved to be active.
Abstract: 0.05 M pyridine--acetate buffer with pH 5.5 on Sephadex G-100 it yielded three fractions; the second and third fractions were active with respect to superovulation, while the third fraction was free from follicle-stimulating activity. When the same preparation (6 months from the time of its production) was subjected to gel filtration carried out under analogous conditions, the first fraction, which was homogeneous on electtophoresis in a starch gel, proved to be active. This might possibly be connected with the aggregation of the protein during storage.