2, 2'-Dimethyl-9, 9'-bitriptycyl. A case of an enormous rotational barrier between sp3-hybridized carbon atoms

LH Schwartz, C Koukotas, CS Yu

Index: Schwartz,L.H. et al. Journal of the American Chemical Society, 1977 , vol. 99, # 23 p. 7710 - 7711

Full Text: HTML

Citation Number: 10

Abstract

4 trophotometrically by monitoring the disappearance of the phenoxide ion absorption at 291 nm. Clean first-order behavior was observed in all cases. The kinetic results' are shown graphically in Figure 1. The most striking finding is a marked Ba2+-and Sr2+-induced increase in the cyclization rate, which strongly suggests that a template effect is involved in the process according to Scheme I, where the rate constant k'for the conversion of the ...