(η5-C5H5)Co(CO)2 catalyses the [2 + 2 + 2] cycloaddition of silylated enediynes to furnish 1-trimethylsilyl and 1,11-bis(trimethylsilylated) A-ring aromatic steroids which unexpected hindered rotation of the trimethylsilyl groups.
No takes yet. Share an insight, caveat, or question.
Butenschön et al. (1986) studied this question.