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By A. I. Scott, D.H.R. Barton and W. Doering (Auth.)

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38-46 show an average deviation of ± 3 τημ from the calculated value. An exception is No. 39 ( + 7 τημ) which is close to the disubstituted value. 6 on new systems. Two recent examples are worked in detail below. Example 3. Isotetrahydrolactucin dienone (XVIII). O uV-OAc \_ HOCH2 C02H XVIII Λ,281 (ε 14,000) m//41. ^aicH = 202 (parent) + 12 (j3) + 36 (γ + δ) + 5 (exo C=C) + 30 (C=C ext. ) = 285 ταμ. t This category includes acylcycloalkenes.

280 πιμ due to intervention of charged ionic species (asX). This effect is considered further in Chapter 2. 38 THE ULTRAVIOLET SPECTRA OF NATURAL PRODUCTS Aldehydes The n -+ π* band of saturated aldehydes occurs at ca. 290 πιμ (ε~ 15), while the low wavelength band is at 193 τημ in acetaldehyde. 11), except in the case of angular aldehydes (No. 3). Carboxylic Acids, Esters and Lactones The —C02R grouping absorbs weakly (ε ~ 40) at 200-205 τημ, a com­ bination of intensity and maximal position which renders diagnosis by elec­ tronic absorption almost impossible.

SOC, 76, 4348 (1954). 10. R . C . T H O M A S and L . J . , 78, 6151 (1956). 11. RIECHE and K . K O C H , Ber. dtsch. ehem. , 75, 1016 (1942). 12. , 553, 187 (1942). 13. Inter alia R . N . J O N E S and co-workers, J. Amer. , 74, 2828 (1952). 14. WENKERT and B . G . , 80, 211 (1958). 15. L . W . WIEDER, D . A . S E M E N O W and J . M . 9 75, 1618 (1953). 16. 17. 18. 19. 20. N . J . L E O N A R D and D . M . , 77, 437 (1955). J . R . P L A T T , H . B . , 17, 466 (1949). Acta, 42, 1480 (1959). ELLINGTON and G .

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