13C NMR study of the structures of some acyclic and cyclic ketene acetals
✍ Scribed by E. Taskinen; M.-L. Pentikäinen
- Publisher
- Elsevier Science
- Year
- 1978
- Tongue
- French
- Weight
- 522 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0040-4020
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## Abstract The structures of cyclic polyketones, their hydrates and reduction products were studied in different solvents by ^13^C‐NMR. spectroscopy. In dimethylsulfoxide solution rhodizonic acid **(1)**, croconic acid **(2)** and squaric acid **(3)** exhibit signal averaging. In anhydrous tetrahy
## Abstract A chemical shift analysis of the ^13^C NMR spectra of more than 50 acyclic sulphonic acids, alkali metal sulphonates and methyl esters was carried out. Chemical shift increment systems with __n__‐alkanes as reference molecules were established for linear alkanesulphonates and alk‐2‐enes
## Abstract Aldehyde (δCH) and enolic (δOH) proton chemical shifts, the corresponding spin–spin coupling constants (__J__CH,OH) and the ^13^C chemical shifts (δC) have been measured for three cyclic β‐ketoaldehydes as a function of temperature. A tautomeric equilibrium has been shown to exist betwe