A diminution in the HOMO‐LUMO energy difference with increasing chain length in the polystannanes 2 mentioned in the title is indicative of a smooth transition between covalently bound polystannanes and metallic tin and thus affords grounds for answering the question posed in the title in the affirmative. The four polystannanes synthesized according to equation (a) are all‐trans‐configurated; compound 2, with n4, contains the longest SnSn bond observed so far. equation image
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Adams et al. (1987) studied this question.
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