What type of intermediate is present when the Grubbs catalyst and a terminal alkene react?

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When a Grubbs catalyst (a type of carbene) reacts with a terminal alkene, it forms a metallocyclobutane intermediate. This intermediate contains a four-membered ring where two of the carbons are from the alkene and two are from the carbene. This intermediate is highly reactive and can undergo various transformations, including ring-opening to form a new alkene and regenerating the catalyst.

What Type of Intermediate Is Present When the Grubbs Catalyst