Crystal and Molecular Structure of (Tri‐tert‐butyl‐η5‐cyclopentadienyl)‐(1,2,4‐tri‐tert‐butyl‐η3‐cyclopentenyl)nickel

(Tri‐tert‐butyl‐η5‐cyclopentadienyl)(1,2,4‐tri‐tert‐butyl‐η3‐cyclopentenyl)nickel (1) is accessible by the metal vapor route. The molecule adopts a slipped sandwich structure in the solid state with the nickel atom η5‐η3‐coordinated to the five‐membered rings. Its 13C‐NMR data are reported together with data on (tert‐butyl‐η5‐cyclopentadienyl)(tert‐butyl‐η3‐cyclo‐pentenyl)nickel 2 and (di‐tert‐butyl‐η5‐cyclopentadienyl)(di‐tert‐butyl‐η3‐cyclopentenyl)nickel 3.