This reaction is quite dangerous as the Group 1 metals are all highly reactive. They are stored under oil to prevent any reaction with air or water vapour when in storage.

Understanding the Impact of Group 14 Elements on the Reactivity of [1 + 2] Cycloaddition Reaction between a Cyclic (Alkyl) (amino)carbene Analogue with a Group 14 Element and a Heavy Acetylene ...

Understanding the Reactivity of “Naked” Acyclic Carbene-like Species Featuring a Group 13 Element in the [4+1] Cycloaddition with Benzene ...