## Abstract Par hydroxylation de cyclopenténediols‐3,4 et 3,5 __cis__ ou __trans__, on a prèparè 5 cyclopentanetbtrols. L'un d'eux a ètè obtenu aussi par oxydation permanganique du cyclopentadiéne, à côtè d'un èpoxycyclopentanediol qui reprèsente peut‐êre un intermèdiaire. Un cyclopentanetriol et u
Recherches dans la série des cyclitols XXXVIII Etudes conformationnelles de dérivés cyclopenténiques disubstitués-3, 5
✍ Scribed by F. G. Cocu; G. Wolczunowicz; L. Bors; Th. Posternak
- Publisher
- John Wiley and Sons
- Year
- 1970
- Tongue
- German
- Weight
- 707 KB
- Volume
- 53
- Category
- Article
- ISSN
- 0018-019X
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
Cyclopentenones substituted in position 4, and 3, 5‐cis or ‐trans disubstituted cyclopentenes have been studied by NMR. and by IR. spectroscopy. Cyclopentenone derivatives and cyclopentene derivatives adopt a quasi‐coplanar and an envelope conformation, respectively. The preferential orientation of the substituents has been established according to their nature and to the solvents by correlation to the vicinal and the long‐range coupling constants.
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## Abstract The conversion to free ketoses by transketalisation of ethylene‐ketal and/or isopropylidene derivatives of polyhydroxy‐cyclopentanones has been investigated. The preparation of 2, 3‐dihydroxy‐cyclopentanone and of 2, 3‐dihydroxy‐cyclopentenone has been described.
l m v resolution mass spectra of cyclohcxanc-triols, -tetrols, -pcntols and -hexols and of some of their deuterium labelled derivatives have bcen mcasurcd. The results indicate that for some geometrical isomers quantitative differences between ion intensities are significant. allowing to deduce the
## RGSUME Des synthkses du laminitol rackmique et de sa forme lkvogyre naturelle ont Ctk effectuCes B. partir resp. du penta-O-acCtyl-mkthylkne-4(6)-dCsoxy-4(6)-ms-inositol et du penta-O-acCtyl-mCthyl~ne-6-dksoxy-6-ms-inositol. Genhe, Laboratoires de Chimie biologique et organique spkciale de 1'Un
j23] I (!PL\C Tcntativc Rules for t h e Konienclaturc o f Organic Chcniistry. Sectioii E. l'undanicntal j2-I-I I;. ,/. .-1hval~um & J . A . I'oplr, Blolecular l'hysics J, 609 (1060).