## Abstract 2,3‐Dimethylidenebicyclo [2.1.1]hexane **(4)** was isolated from direct irradiation (253.7 nm) of 5,6‐dimethylidene‐2‐norbornanone **(3)**. Quenching experiments at 253.7 nm, as well as direct and sensitized irradiations at >300 nm suggested that a high vibrationally excited __S__~1~‐ o
✦ LIBER ✦
Synthesis and Diels-Alder Reactivity of 1-(Dimethoxy)methyl-2,3,5,6-tetramethylidene-7-oxabicyclo[2.2.1]heptane. Preliminary communication
✍ Scribed by Jean-Luc Métral; Pierre Vogel
- Publisher
- John Wiley and Sons
- Year
- 1985
- Tongue
- German
- Weight
- 221 KB
- Volume
- 68
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
A short synthesis of the title compound 13 is reported. The acetal group in 13 enables one to control the regio‐ and stereoselectivity of the two successive Diels‐Alder additions of the tetraene. The first addition is significantly faster than the second one, thus making 13 a versatile reagent for regio‐ and stereoselective ‘tandem’ cycloadditions.
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