Protonation of the 1,3-dithiol-2-ylidene iron(0) complex (2a) occurs at the carbene carbon centre, but proceeds via a trans hydrido-carbene intermediate, isomerization into the cis derivative, and metal to carbene carbon 1,2 hydrogen shift.
H. Le Bozec, J. Fillaut and P. H. Dixneuf, J. Chem. Soc., Chem. Commun., 1986, 1182 DOI: 10.1039/C39860001182
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