By Dieter Hellwinkel (auth.)

Content material: Penta- and hexáorganyl derivatives of the most crew 5 components / D. Hellwinkel - Enantioselective synthesis of nonproteinogenic amino acids / U. Schöllkopf -- chosen issues of the Wittig response within the synthesis of common items / H.J. Bestmann, O. Vostrowsky -- commercial functions ot the Wittig response / H. Pommer, percent. Thieme -- perspective strained cycloalkynes / A. Krebs, J. Wilke

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For details on the stereochemical course of the above reaction sequences see the discussions pertaining to the corresponding phosphorus compounds. 946 ,& respectively ~27} An even clearer picture emerged from systematic ~H-NMR-investigations of bis2,2'-biphenylyleneorganylarsorane systems provided with appropriate monitors 79, 128~. Thus, in the case of spiroarsoranes 122, 136, temperature-dependent reversible coalescence phenomena for the various diastereotopic groups could be observed, exactly as in the case of analogous phosphorus compounds.

50, 11268f(1956)) Razuvaev, G. A , Petukhov, G. : Zhur. Obshch. Khim. 29, 2980 (1959); (C. A. 54, 12030e (1960)) ibid. 31, 2350 (1961); ((2. A. 56, 3506i (1962) 40. Kochendoerfer, E. : Dissertation, Heidelberg 1959 18. 19. 20. 21. 59 Dieter Hellwinkel 41. Gielen, M. : in Chemical Applications of Graph Theory (ed. Balaban, A. ) Academic Press, London 1976. Chapter 9, p. 261 42. , Kochendoerfer, E. : Angew. Chem. 70, 506 (1958); Chem. Ber. 97, 741 (1964) 43. Mann, F. , Chaplin, E. J. : J. Chem. Soc.

Wheatley, P. : Proc. Chem. Soc. 1962, 251 63. Wheatley, P. J. : J. Chem. Soc. 1964, 2206 64. For a preliminary note see also: Hellwinkel, D. : Angew. Chem. 76, 756 (1964) 65. Richards, E. , Tebby, J. C. : J. Chem. Soc. ~ 1970, 1425 66. Hellwinkel, D. : Chem. Ber. 99, 3628 (1966) 67. , Mason, S. F. : J. Chem. Soc. B 1970, 640 68. , Wilfinger, H. J. : Phosphorus 2, 87 (1972) 69. Berry, R. S. : J. Chem. Phys. 32, 933 (1960) 70. Gillespie, R. J. : J. Chem. Soc. 1963, 4672 71. Muetterties, E. , Schmutzler, R.

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