Schadt studies

Grunwald-Winstein eqn (9) with OTs values derived from 2-adamantyl tosylate (Section 3, p. 36) and with iV0Ts values based on methyl tosylate (Section 5), Schadt et al. (1976) have correlated a variety of solvolyses of other tosylates. Whilst their work is more extensive in that Sn 2 type solvolyses were studied (Table 9), only tosylates have been examined and solvation effects caused by different leaving groups are thus minimized. However, the subtlety of solvation effects is emphasized by the dependence of the relative rates of p-bromobenzenesulphonates and tosylates on solvent electro-... 

Weber PC, Lee S-L, Lewandowski FA, Schadt MC, Chang C-H, Kettner CA. Kinetic and crystallographic studies of thrombin with Ac-(D)Phe-Pro-boroArg-OH and its lysine, amidine, homolysine, and ornithine analogs. Biochemistry 1995 34 3750-3757. 

Schadt et al [28] have examined chain motion of poly(p-phenylene terephthalamide) (PPTA) another sp hybridized chain. They find that 20-25% of N-D bonds undergo twofold jump motion about the 1,4 axis of the terephthalamide phenylene ring, but not the 1,4 axis of the diamine ring. The result suggested that dynamic heterogeneity accompanies the structural heterogeneity of PPTA. These studies of PPV and PPTA have revealed that considerable motion is possible in an sp hybridized chain. 

From 1967 until 1970, he worked at the RCA Lahoratories in Princeton where he was a member of an inter-diseiplinary group of physicists, chemists, and engineers studying the electro-optical properties of liquid crystals. From 1970 to 1973, he was at Hoffmann-La Roche in Basel, where he invented, together with Martin Schadt, a novel liquid crystal display. For this invention, he received the Hewlett-Packard Europhysics Award in 1976. Since 1973, W. Helfrich has worked and taught at the Freie Universitat Berlin. His scientific achievements were also honored with the Hennessy Prize for innovation ( science pour Tart ) in 1993. 

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