μ-Alkylidyne and μ-Alkylidene Complexes from a Bridging Side-on Vinylidene Sulfur-Rich Dimolybdenum Precursor

Abstract

Reaction of the μ-vinylidene complexes [Mo 2 (η 5 -C 5 H 5 ) 2 (μ-SMe) 3 (μ-η 1:η 2 -C CHR)](BF 4 ) ( 1; R = Tol ( 1a ), n -Pr ( 1b )) with NaBH 4 produced the μ-alkylidyne derivatives [Mo 2 (η 5 -C 5 H 5 ) 2 (μ-SMe) 3 (μ-CCH 2 R)] ( 2; R = Tol ( 2a ), n -Pr ( 2b )) in good yields. Upon treatment with HBF 4 ·Et 2 O 2a and 2b were readily converted into the μ-alkylidene species [Mo 2 (η 5 -C 5 H 5 ) 2 (μ-SMe) 3 (μ-η 1:η 2 -CHCH 2 R)](BF 4 ) (R = Tol ( 3a ), n -Pr ( 3b )). NMR studies on these μ-alkylidene complexes revealed α-agostic interactions.