“…In the context of our research the first late transition metal cyclopentadienylalkylphosphane complexes 6-12 with a secondary phosphane tether have recently been prepared (Scheme 3). [17,35] Chelate 6, which was obtained in up to 50 % yield, is the result of an unexpected protiodesilylation of the respective tertiary (tert-butyldimethylsilyl)-tert-butylphosphanyl chelate in the course of a column chromatography on silica gel. [17] Chelates 7 and 8 were obtained in a one pot reaction sequence starting from (2,4,6-tri-tert-butylphenyl)phosphane, [36] which was subsequently treated with butyllithium, spiro [2.4]hepta-4,6diene, [37] and NiCl 2 (dme) 2 or NiBr 2 (thf) 2 , in an overall yield of 48 % or 69 %, respectively.…”