Issue 41, 2020

Modelling of an aza-Michael reaction from crystalline naphthalene derivatives containing periperi interactions: very long N–C bonds?

Abstract

The separation between a pair of peri-located dimethylamino and ethene-2,2-dinitrile groups in a naphthalene molecule, which models the progress of a Michael reaction, can be controlled by the installation of a short ethylene bridge or the introduction of repulsive interactions at the opposite set of peri positions. Introduction of a dimethylammonium substituent produced a hydrated chloride salt in which the Me2N⋯C(H)[double bond, length as m-dash]C(CN)2 separation between reactive groups decreases, reversibly, from 2.167 Å at 200 K to 1.749 Å at 100 K, with the maximum rate of change in the range 128–140 K, which was studied by variable temperature X-ray crystallography and solid state NMR. From these and other crystallographic data a correlation between Me2N⋯C bond formation and alkene bond breaking was constructed for the first step of an aza-Michael reaction.

Graphical abstract: Modelling of an aza-Michael reaction from crystalline naphthalene derivatives containing peri–peri interactions: very long N–C bonds?

Supplementary files

Article information

Article type
Paper
Submitted
04 Aug 2020
Accepted
16 Sep 2020
First published
17 Sep 2020
This article is Open Access
Creative Commons BY-NC license

CrystEngComm, 2020,22, 6783-6795

Modelling of an aza-Michael reaction from crystalline naphthalene derivatives containing periperi interactions: very long N–C bonds?

J. C. Bristow, I. Naftalin, S. V. A. Cliff, S. Yang, M. Carravetta, I. Heinmaa, R. Stern and J. D. Wallis, CrystEngComm, 2020, 22, 6783 DOI: 10.1039/D0CE01137A

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