Read e-book online Dynamic Stereochemistry PDF

By Boschke F.L.

Content material: thought of orientation and stereoselection / ok. Fukui -- contemporary advancements within the chemistry of the reduce boron hydrides / H.D. Johnson, S.G. Shore -- Preparative points of boron-nitrogen ring compounds / A. Meller -- 1,3,2-diazaboracycloalkanes / okay. 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, scan and thought / J.M. Lehn -- Konformative Beweglichkeit von Siebenring-Systemen -- advent to all-valence electrons S.C.F. ; Calculations of enormous natural molecules: concept and purposes

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B. I n v e r s i o n B a r r i e r s f r o m T o t a l I n v e r s i o n R a t e s . . . . . . . . . . a) N M R D e t e r m i n a t i o n of R a t e C o n s t a n t s . . . . . . . . . . . . b) K i n e t i c M e t h o d s . . . . . . . . . . . . . . . . . . . . . . c) R e l a x a t i o n M e t h o d s . . . . . . . . . . . . . . . . . . . . . d) C a l c u l a t i o n of I n v e r s i o n B a r r i e r s . . .

10 s sec -1. It is also seen that increasing the reduced mass by a factor of 2 as in NDs decreases the inversion rate by a factor of 11. Molecules with small and thin barriers (slightly pyramidal molecules) like H z N - C N , H2N--CHO undergo very fast tunneling (Table 1). The same is true for most primary and secondary amines (except those having high barriers like aziridine, o x a z i r i d i n e . . ) . The tunneling frequency is expected to be much smaller when the inversion barrier becomes high and thick and when the reduced mass of the systems increases.

B. R i n g S t r a i n . . . . . . . . . . . . . . . . . . . . . . . . . . 2, E l e c t r o n i c Effects . . . . . . . . . . . . . . . . . . . . . . . . A. (p-p)z~ C o n j u g a t i o n . . . . . . . . . . . . . . . . . . . . . . I3. (d-p)~ C o n j u g a t i o n . . . . . . . . . . . . . . . . . . . . . . C. E f f e c t of H e t e r o a t o m s . . . . . . . . . . . . . . .

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Dynamic Stereochemistry by Boschke F.L.


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