This paper pre,;ents a novel method for the chemical synthesis of cholest-4-ene-3,6-dione, which is a naturally occurring steroid and a potential intermediate in steroid chemistry. Pyridinium chlorochromate (PCC) in refluxing benzene has been found to be an effective and convenient reagent for the o
Carbon-13 nuclear magnetic resonance study of the bromo derivatives of 5α-cholestan-3-one and cholest-4-en-3-one
✍ Scribed by Johannes Römer; Dieter Scheller; Gisbert Grossmann
- Publisher
- John Wiley and Sons
- Year
- 1987
- Tongue
- English
- Weight
- 516 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0749-1581
No coin nor oath required. For personal study only.
✦ Synopsis
The 13C N M R spectra of nineteen bromo derivatives of 5ru-cholestan-3-one, cholest4-en-3-one and cholest-5-en-3one have been recorded. The substituent effects are analysed and examined with respect to additivity. The more interesting ys,,, and ylmti effects are considered in detail.
KEY WORDS 13C NMR Bromo derivatives of 5a-cholestan-3-one and cholest-4-en-3-one Substituent effects in Tables 1 and2. The tables do not include the chemical shifts of the side-chain carbons, for which the following
📜 SIMILAR VOLUMES
## Abstract Diastereomeric [(3__S__)‐5α]‐ and [(3__R__)‐5α]‐2′,2′‐dichlorospiro‐[cholestane‐3,1′‐cyclobutan]‐3′‐ones (1 and 2), prepared by cycloaddition reaction of dichloroketene with 3‐methylene‐5α‐cholestane, served as starting material for the synthesis of the related spirane derivatives. Thus
## Abstract The influence of substituents in a new series of 2__H__‐thiopyrans, 2__H__‐thiopyran‐2‐ones (thiones) and their thiazine analogues is examined by means of carbon (^13^C) and nitrogen (^15^N) NMR. A linear relationship is shown to exist between the chemical shifts (δ~13C~ or δ~15N~) of t