13-Aminotridecanoic acid, the monomer for nylon 13, was synthesized from commercial erucic acid or its derivatives by several methods in a study to determine the method of choice, which involved oxidative ozonolysis of eruconitrile, followed by esterification before isolation to give methyl 12-cyanododecanoate. The cyano ester was then catalytically reduced and hydrolyzed, without isolation of ...

1. After administration of 600mg of 3H-labelled aldosterone to human volunteers, 57 mg of homogeneous acid-labile conjugate was isolated from the urine and identified as aldosterone 18 beta-D-glucosiduronic acid. 2. Esterification and acetylation of the conjugate gave a tetra-acetate methyl ester, which, by measurement of the optical rotation and nuclear-magnetic-resonance spectrum, was shown t...

Bu çalışma endemik Amanos Sığırkuyruğu ile Belen sığırkuyruğunun uçucu bileşenlerini ortaya çıkarmak için bitki eksratte edilmiş ve ultrasonic banyo yapılarak GS-MS analizi yapılmıştır. GC-MS kütüphanesinde sonuçlarına göre bileşenler kıyaslandığında, Sığırkuyruğunda kimyasal bileşenlerinin benzerlik ilişkileri toplam on üç bileşen bulunmuştur. ise dört tespit edildi. bileşenlerin biyoaktivitel...

Chemical analysis of the Mediterranean ascidian Polyandrocarpa zorritensis (Van Name 1931) resulted in the isolation of a series of molecules including two monoindole alkaloids, 3-indolylglyoxylic acid (3) and its methyl ester (4), 4-hydroxy-3-methoxyphenylglyoxylic acid methyl ester (1) and a new alkaloid we named zorrimidazolone (2). The structure of the novel compound 2 has been elucidated b...

A bicyclo[2.2.2]octane derivative containing both a tertiary amide and a methyl ester (1) was shown crystallographically to adopt a conformation in which the amide is in the cis configuration, which is sterically disfavored, but electronically favored. The steric strain induces a significant torsion (15.91) of the amide, thereby greatly increasing the solvolytic lability of the amide to the ext...

governerate, Egypt. Spirulina platensis was obtained from cyanobacteria Lab., Microbiology Dept., Sakha Agricultural Research Station, GC/MS analysis showed that 37 and 7 bioactive compounds A. variabilis S. were identified, respectively. Moreover, the area percentage of same compound varied according to type cyanobacteria. The major phytochemical constituents in methanol extract are Pentadecan...

I. The role of carboxyl groups in the binding of specific carbohydrates to concanavalin A, the phytohemagglutinin of the jack bean, has been studied using two techniques: (I) H + titration in the presence and absence of methyl a-D-mannopyranoside, a specifically bound carbohydrate ligand and (2) chemical modification of the protein carboxyl groups employing glycine methyl ester and a water-solu...

The aim of the present research work was to determine the Phyto-constituents in fraction collected from ethanolic extract of Pericampylus glaucus leaf using the GC and Mass spectrometry. The Phyto-chemical screening of fraction from ethanolic extract of Pericampylus glaucus leaves were carried out with the help of Perkin-Elmer GC followed by Mass Spectrometry. The GC-MS chromatogram of Pericamp...