The similar behavior of PC and CC double bonds is revealed, in particular, in compounds containing both types of π bond, for example in phospha‐1,3‐butadienes. Up to three C atoms have been so far replaced by P atoms in various positions of butadiene. It has now been possible—thanks to the use of bulky substituents—to synthesize, for the first time, two 1,4‐diphospha‐1,3‐butadiene derivatives.
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Appel et al. (1987) studied this question.
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