The bis(butadiene)rhodium(I) complexes [Rh(s-cis-η4-C4H6)2(PR3)]A readily convert into the isomeric octadienediyl derivatives [Rh(η3:η3-C8H12)(PR3)]A , which are apparently intermediates in the rhodium-catalyzed cyclotetramerization reaction of butadiene. R=iPr, Cy; A=OSO2CF3, B[3,5-(F3C)2C6H3]4; the structure of the complex with iPr and OSO2CF3 is shown.
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Bosch et al. (2000) studied this question.