By Jan Hamer
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Backer, H. , Rec. Trav. Chim. 54, 618 (1935). 29. Backer, H. , Rec. Trav. Chim. 56, 1069 (1937). 30. Backer, H. , Rec. Trav. Chim. 62, 815 (1943). 31. Backer, H. , and Huisman, L. Η. , Rec. Trav. Chim. 60, 381 (1941). 32. Backer, H. , and Kool, C. Μ. , Rec. Trav. Chim. 58, 778 (1939). 33. Backer, H. , and Zuithoff, A. , Rec. Trav. Chim. 55, 761 (1936). 34. Bailey, W. , and Cummins, E. , J. Am. Chem. Soc. 76, 1932 (1954). 35. Bailey,. W. , and Cummins, E. W . , / . Am. Chem. Soc. 76, 1936 (1954).
P. between different preparations has not been resolved; it may be suggestive of the presence of the 2-phospholene isomer in some cases. M . p . 75-77° C. p. 66-67° C. p. 66-71° C. f Product not analyzed. 0 Unstated. Μ . ρ . 94-96° C. p. 96-98° C. p. 125° C. a Diene Table I—continued 54 Louis D. Quin 3. Trivalent Phosphorus Compounds as Dienophiles 55 These new compounds were characterized by melting and boiling points, and in most cases by analysis. While intuitively the proposed structure seems correct, no direct evidence in its favor was presented.
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1,4-Cycloaddition Reactions: The Diels-Alder Reaction in Heterocyclic Syntheses by Jan Hamer