The molecular structure of 4a, 5, 8, 8a-tetrahydro-11, 14-dimethoxy-7-methyl-4a-(3-methyl-2-butenyl)-5, 8a-o-benzeno-1, 4-naphthoquinone
✍ Scribed by S.K. Agarwal; R.P. Rastogi; H. Van Koningsveld; K. Goubitz; G.J. Olthof
- Publisher
- Elsevier Science
- Year
- 1980
- Tongue
- French
- Weight
- 356 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0040-4020
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## Abstract Diels–Alder cycloaddition of a mixture of 1‐ and 2‐methylcyclopentadienes (1a and 1b, respectively) to 2‐methoxy‐__p__‐benzoquinone (2) gave a mixture of isomeric __endo__ [4 + 2] cycloadducts (3a–3d). Fractional recrystallization of this product mixture from EtOAc‐hexane gave 6‐methoxy