✦ LIBER ✦
Cyclodimerisation reactions of conjugated dienes with aldehydes—I: Formation of tetrahydropyrans and their 300 MHz 1H NMR spectra
✍ Scribed by A. De Smet; M. Anteunis
- Publisher
- John Wiley and Sons
- Year
- 1973
- Tongue
- English
- Weight
- 320 KB
- Volume
- 5
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
The palladium catalysed reaction of butadiene with aldehydes yields 2‐substituted 3,6‐divinyl‐tetrahydropyrans.^1–4^ The reaction has been extended to isoprene and myrcene. With formaldehyde only 2,5‐substituted pyrans have been isolated. The isomeric tetrahydropyrans obtained were fully characterised by ^1^H NMR, and representative 300 MHz spectra are given. Attempts to react aldehydes with 2‐methoxybutadiene were unsuccessful.