| Abstract
| - The synthesis of rod- and star-shaped compounds carrying two or three spin labels as end groupsis described. The unpaired electrons are 2.8−5.1 nm apart from each other. The shape-persistentscaffolds were obtained through Pd−Cu-catalyzed alkynyl−aryl coupling and Pd−Cu-catalyzedalkyne dimerization in the presence of oxygen using p-phenyleneethynylene as the basic shape-persistent building block. The spin label 1-oxyl-2,2,5,5-tetramethylpyrroline-3-carboxylic acid (4)was attached through esterification of the terminal phenolic OH groups of the scaffold.
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