## The investigation of the chemical constituents of Symplocos racemosa Roxb led to the isolation of two new glycosides, symcomoside A (1) and symcomoside B (2), together with one known glycoside, tortoside C (3), which is reported for the first time from this plant. The structures of the new comp
Structure Determination of an Unusual [2.2]paracyclophane Derivative by NMR Spectroscopy
✍ Scribed by Eszter Gács-Baitz; Orsolya Egyed; Aldo Taticchi; Lucio Minuti; Assunta Marrocchi
- Publisher
- Springer
- Year
- 2005
- Tongue
- English
- Weight
- 187 KB
- Volume
- 16
- Category
- Article
- ISSN
- 1040-0400
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The relative orientation of substituents in the opposite rings of one of the isomeric 4,7-dichloro-5,8,12,19 tetramethoxy-13,1Cbis[~~methoxycarbonylphenyl)butyl~[2.2~paracyclophanes was determined by establishing by NOE their orientation relative to the bridge protons, which thus served as 'space-sp
Homologous series of dihydroxamic acids [HONHCO(CH 2 n CONHOH with n D 0, 1, 2, 3, 4 and 6] were prepared and trimethysilylated [1(n) and 2(n)]. The solution NMR spectra ( 1 H, 13 C, 15 N) of 1(n) show that the hydroxamic end groups assume Z-Z and Z-E combinations of conformers. An exception is oxal