Tungsten–tungsten double and triple bonds are found in the dimers 1 (structure depicted on the right; calixarene substituents partly omitted) and 2, respectively, formed by the reductive coupling of the corresponding dichlorotungsten compounds. In 1 the two Na+ ions are located in the calixarene cavity; in 2 they bridge the two calixarene units. py = pyridine.
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Giannini et al. (1997) studied this question.
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