Chemical Structure from Scientific Research

The packing of two molecules of 1a from 1a2(CH2Cl2) (top; CH2Cl2 molecules omitted for clarity) and one molecule of 2 (bottom), with annotated expansions of each respectively to the right showing the close intermolecular proximity of the alkene groups of their 4-stypy ligands in the solid state (illustrated by dashed red lines).

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