We subsequently set out to explore the scope of C-C unsaturated bonds we could activate with 4. Treating a THF solution of 4 with 1 equiv of diphenylacetylene at ambient temperatures resulted in full conversion of 4 to 6 (Scheme 6, top-right). Analysis of the 1 H-and 13 C{ 1 H}-NMR spectra (THF-d 8 , see ESI Section 1.8) revealed similar spectra to 5. The characteristic 13 C{ 1 H} chemical shift of the bridgehead methine (δ = 85.4 ppm) and a 1 H- C HMBC cross peak between its attached proton and a carbon resonance at δ = 165.8 ppm (attributed to the alkyne carbon added to the methine carbon of the NHGe motif) confirm the addition of the alkyne triple bond over the NHGe.