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22
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9544232115
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note
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The yields of the modified Wittig olefination of phosphonate 4 with ketone 5 in the usual way were only 10-20%, but they were 46-58% in the presence of silica gel and 4 Å molecular sieves and refluxing overnight. Scope and limitations of this reaction will be reported elsewhere.
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23
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9544220101
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The ratio was determined by GC analysis
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The ratio was determined by GC analysis.
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25
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0021062284
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Corey, E.J.; Pyne, S.G.; Su, W. Tetrahedron Lett. 1983, 24, 4883.
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Corey, E.J.1
Pyne, S.G.2
Su, W.3
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26
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0019131021
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Heath, R.R.; Doolittle, R.E.; Sonnet, P.E.; Tumlinson, J.H. J. Org. Chem. 1980, 45, 2910.
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Heath, R.R.1
Doolittle, R.E.2
Sonnet, P.E.3
Tumlinson, J.H.4
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27
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0016430726
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Ellison, R.A.; Lukenbach, E.R.; Chin, C.W. Tetrahedron Lett. 1975, 16, 499.
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Ellison, R.A.1
Lukenbach, E.R.2
Chin, C.W.3
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28
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9544221104
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note
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The product 1 obtained in the cyclization reaction is a mixture of (E)-1 and (Z)-1 isomers.
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29
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0006025774
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In this literature the diastereoisomer of 2 was reported and the stereochemistry of epoxide and isopropenyl groups is not defined. The work on the assignment of the stereochemistry of the remaining three isomers is in progress
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Ravi, B.N.; Faulkner, D.J. J. Org. Chem. 1978, 43, 2127. In this literature the diastereoisomer of 2 was reported and the stereochemistry of epoxide and isopropenyl groups is not defined. The work on the assignment of the stereochemistry of the remaining three isomers is in progress.
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J. Org. Chem.
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Ravi, B.N.1
Faulkner, D.J.2
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