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Complete solution NMR analysis of three oligoimine model compounds

✍ Scribed by Lynne Spencer; William B. Euler; Daniel D. Traficante; Misoo Kim; William Rosen

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
199 KB
Volume
36
Category
Article
ISSN
0749-1581

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✦ Synopsis

A series of three model compounds (monomer, dimer and trimer analogues) representing polyisocyanides were synthesized and their solution NMR spectra were characterized. Analysis of the monomer and dimer analogues led to the conclusion that the most stable forms of these molecular systems are planar with the CÈC bond in an s-trans conformation and the imine moieties in a Z conformation. In solution, the trimer analogue exhibits a preferred conformation that has a planar s-trans-diimine segment covalently attached to a magnetically isolated monoimine segment such that each segment is oriented at approximately 90¡ to the other. This latter observation gives signiÐcant insight into the preferred molecular structure to be expected for sterically unconstrained poly(N-phenyliminomethylene) in solution.

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