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Enones: Volume 2 (1989)

Content:
Chapter 14 Enone electrochemistry (pages 599–622): R. Daniel Little and Manuel M. Baizer
Chapter 15 The photochemistry of enones (pages 623–756): David I. Schuster
Chapter sixteen Radiation chemistry of enones (pages 757–780): P. Neta and M. Dizdaroglu
Chapter 17 The oxygenation of enones (pages 721–921): Aryeh A. Frimer
Chapter 18 aid of ?, ??unsaturated carbonyl compounds (pages 923–1022): Ehud Keinan and Noam Greenspoon
Chapter 19 Organometallic derivatives of ?, ??unsaturated enones (pages 1023–1062): James A. S. Howell
Chapter 20 Dienols (enolization of enones) (pages 1063–1087): Brian Capon
Chapter 21 uneven synthesis with chiral enones (pages 1089–1132): Michael R. Peel and Carl R. Johnson
Chapter 22 Dimerization and polymerization of enones within the fluid and reliable states (pages 1133–1176): Charis R. Theocharis

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685 iii. Di-n-methane rearrangements: 1, 2-aryl and 1, 2-vinyl migrations . . . . . . . . . 693 623 624 V. VI. David I. Schuster iv. Ring contraction to cyclobutanones . . . . . v. Rearrangement to fl, y-unsaturated ketones. . . . vi. Allylic rearrangements and cyclizations: wavelengthdependent photochemistry . . . . . . vii. Rearrangements of photogenerated enone radical anions . d. Direct observation of triplet states of cyclohexenones by nanosecond laser flash techniques .

93, 2432 (1971). 22. J. Grimshaw and H. R. Juneja, J . Chem. Perkin Trans. I , 2529 (1972). 23. P. Margaretha and P. Tissot, Noun J. , 3, 13 (1979). 24. A. J. Fry, in Topics in Current Chemistry, 34, Springer-Verlag, New York, 1972, pp. 1-46. 25. M. M. Baizer and J. P. Petrovich, in Prog. Phys. Org. , 7, 189 (1970). 26. F. Beck, Angew. , Int. Ed. , 11, 760 (1972). 27. M. M. , 973 (1963). 28. M. M. Baizer, J. Electrochem. ,111, 215 (1964). 29. M. M. Baizer and J. D. Anderson, J. Electrochem. ,111, 223 (1964).

The photochemistry of enones depicted in Figure 4 for the a,&enones. The a+n* absorption for typical j,y-enones without conjugating substituents is centred at ca 220nm and the n + a * absorption typically has 1,, 290-3 10 nm. What is notable is the intensification of the n + a* absorption for many (but not all) B,y-enones, with values of ~ 3 - 1 0times as large as for a,Benones (see Table 2 for representative examples). This effect has received a great deal of attention from spectroscopists, and is discussed at length in a review by Houk6 on the spectroscopy and photochemistry of b, y-enones.

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