By Jan Hamer

ISBN-10: 0123957435

ISBN-13: 9780123957436

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And Khmel'nitskii, L. , Dokl. Akad. Nauk SSSR 92, 101 (1953); see Chem. Abstr. 48, 10725 (1954). 151. Yur'ev, Yu. , and Khmel'nitskii, L. , Dokl. Akad. Nauk SSSR 94, 265 (1954); see Chem. Abstr. 49, 312 (1955). 152. , Roczniki Chem. 34, 413 (1960); see Chem. Abstr. 55, 420 (1961). 153. Zutty, N. L„ and Wilson, C. , Tetrahedron Letters p. 2181 (1963). 154. Zuydewijn, E. de R. van, Rec. Trav. Chim. 56, 1047 (1937). 155. Zuydewijn, E. de R. , Rec. Trav. Chim. 53, 673 (1934). 44 CHAPTER 3 Trivalent Phosphorus Compounds as Dienophiles LOUIS D.

There is evidence of fine structure in the three peaks, indicating small, but definite, couplings involving all three types of protons (143). 2 2 8 2 2 4 4 III. Thermal Dissociation of 2,5-Dihydrothiophene-l,l-dioxides A. STRUCTURAL EFFECTS The temperatures at which the diene sulfones rapidly dissociate to the parent diene and sulfur dioxide have been observed for a number of the adducts. These are listed in Table II. Also listed are some data from investigations in which rate measurements were made to allow comparison of temperatures where decomposition rates are equal.

15. Backer, H. , and Blass, Τ. A. , Rec. Trav. Chim. 61, 785 (1942). 16. Backer, H. , and Bolt, C. C , Rec. Trav. Chim. 54, 538 (1935). 17. Backer, H. , Bolt, C. C , and Stevens, W„ Rec. Trav. Chim. 56, 1063 (1937). 18. Backer, H. , and Boon, S. van der, Rec. Trav. Chim. 56, 181 (1937). 19. Backer, H. , and Bottema, J. , Rec. Trav. Chim. 51, 294 (1932). 20. Backer, H. , and Jong, G. J. de, Rec. Trav. Chim. 70, 377 (1951). 21. Backer, H. , and Melles, J. , Koninkl. Ned. Akad. ,Proc. B54,340 (1951).

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1,4-Cycloaddition Reactions: The Diels-Alder Reaction in Heterocyclic Syntheses by Jan Hamer


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