References
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- Dev , S. and Renuka , M. 1986 . CRC Handbook of Terpenoids-Diterpenoids , Vol. III , Boca Raton, FL : CRC Press .
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- Diene 1b was prepared as the major fraction of a ∼2–3,1 mixture of 1b and its Z-isomer. The mixture was used as is and recovery and 1H NMR analysis of starting material indicated that the minor isomer did not react. 1
- Bax , A. and Summers , M. F. 1986 . J. Am. Chem. Soc. , 108 : 2093
- Barltrop , J. and Hesp , B. 1965 . J. Chem. Soc. , : 5182 Photochemical reactions of 1,4-benzoquinone with dienes are known to produce dihydrospiropyrans (4+2 cycloadducts involving the C=O group), presumably via a stepwise process, see a), b) Bruce, J.M. Quart. Rev., Chem. Soc., 1967, 21, 405. c) Wilson, R.M., Gardner, E.J., Elder, R.C., Squire, R.H. and Florian, L.R. J. Am. Chem. Soc., 1974, 96, 2955
- Guay , V. and Brassard , P. 1984 . Tetrahedron , 40 : 5039 a), See also b) Simoneau, B. and Brassard, P. Tetrahedron, 1986, 42, 3767
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- Finley , K. T. 1988 . The Chemistry of the Quinonoid Compounds , Edited by: Patai , S. and Rappoport , Z. Vol. 2 , 537 New York : Wiley-Interscience . For an extensive review, see, Part 1
- For general experimental procedures, see reference 1