By Boschke F.L.
Content material: conception of orientation and stereoselection / ok. Fukui -- fresh advancements within the chemistry of the reduce boron hydrides / H.D. Johnson, S.G. Shore -- Preparative elements of boron-nitrogen ring compounds / A. Meller -- 1,3,2-diazaboracycloalkanes / ok. Niedenzu, C.D. Miller -- Darstellung und Systematisierung von Boraten und Polyboraten / G. Heller -- Allene-Olefin and Allene-Allene cycloadditions ; Methylenecyclobutane and 1,2-dimethylenecyclobutane degenerate rearrangements / J.E. Baldwin, R.H. Fleming -- Nitrogen inversion, test and idea / J.M. Lehn -- Konformative Beweglichkeit von Siebenring-Systemen -- advent to all-valence electrons S.C.F. ; Calculations of enormous natural molecules: thought and functions
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Example text
In the case of bicyclic systems (133--140) there are not yet enough data available for a detailed discussion to be given. 1]nonane (739, 140) compounds are in the range expected for the corresponding monocyclic systems. 2]nonane derivatives 135 and 136 the inversion barriers are larger than in the seven-membered ring compounds 127 and 728. 1]heptane compounds (737, 138A, 138B). The barriers measured in these systems are comparable to those found in the corresponding aziridines and are thus much higher than expected on the basis of angle strain (0~,95 ~ in 737, 138)c).
E) The C(1)--C(7)--C(4) angle is equal to 96 ~ in norbornane 98). 2. Electronic Effects In the present section we shall try to rationalize the variations in inversion barrier in terms of a certain number of electronic effects characterizing the modes of electronic structure changes brought about especially by atoms or groups directly linked to the inverting nitrogen site. In many cases, different effects may be operative in the same compound and their relative contributions are difficult to separate.
Kurmeier, H. : Chem. Bet. IOI, 2697 (1968). : Chem. Rev. 67, 317 (1967). 12s) _ Warburton, M. R. : Tetrahedron Letters 3277 (1967). 127) _ Wright, D. : Chem. Commun. 434 (1968). 13B) Tobey, S. : J. Am. Chem. Soc. 88, 2478 (1966). 130) Untch, K. , Martia, D. J . : J. Am, Chem. Soe. 87, 4501 (1965). 230) v a n Remoortere, F. , Boer, F. : Angew. Chem. Intern, Ed. Engl. 8, 597 (1969). : Compt. , Ser. C 266, 1092 (1968). , Volger, H. , Praat, A. : J. Organometal. Chem. (Amsterdam) 16, P 19 (1969).