The thermal decomposition of 4-methyl-3,6-dihydro-2H-pyran
✍ Scribed by Henry M. Frey; Hugo P. Watts
- Publisher
- John Wiley and Sons
- Year
- 1981
- Tongue
- English
- Weight
- 223 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0538-8066
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✦ Synopsis
Abstract
The thermal decomposition of the title compound has been studied in the gas phase in the temperature range of 584–634 K. The decomposition was found to be a first‐order homogeneous process yielding 2‐methylbuta‐1,3‐diene and formaldehyde. The rate constants obtained at 11 temperatures within the quoted range fitted the Arrhenius equation
The decomposition is probably unimolecular and concerted.
📜 SIMILAR VOLUMES
Dedicated to Professor Heinz Heimgartner on the occasion of his 65th birthday On irradiation (350 nm) in benzene solution, dihydropyranone 3 affords predominantly (75%) the cis-anti-cis HH-dimer 4, but in smaller amounts (12%) also dimer 5, wherein one of the six-membered rings is trans-fused to the
## Abstract The structures of the main products resulting from photocyclodimerization of the title compound **2** and of other 3‐methyl‐substituted ‘oxacyclohex‐2‐en‐1‐ones’ (=dihydropyranones) were determined by X‐ray crystallography. In connection, the ^13^C‐NMR chemical shifts of the cyclobutane
## Abstract An efficient synthesis of 3‐bromoacetyl‐4‐hydroxy‐6‐methyl‐2__H__‐pyran‐2‐one by bromination of dehydroacetic acid in glacial acetic acid is described. Novel 4‐hydroxy‐6‐methyl‐3‐(2‐substituted‐thiazol‐4‐yl)‐2__H__‐pyran‐2‐ones have been prepared from the reaction of 3‐bromoacetyl‐4‐hyd
## Abstract For Abstract see ChemInform Abstract in Full Text.