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The fused tricyclic phosphiranes are obtained as both the <jats:italic>Z<\/jats:italic> and the thermally less stable <jats:italic>E<\/jats:italic> isomers, the <jats:sup>31<\/jats:sup>P\u2005NMR chemical shifts of which differ by about 60\u2005ppm. A computational investigation shows that the phosphorus pyramidalization and the presence of the \u03b3 double bond are responsible for this effect. The semiquantitative results contribute to a more systematic understanding of the structural influences on <jats:sup>31<\/jats:sup>P chemical shieldings. 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