Discuss the reaction of carbenes with trans-2 butane and cis-2-butene. Why is the stereospecificity of these reactions lost when these reactions are carried out in the presence of an inert gas? 

Carbenes are highly reactive and versatile intermediates that can react with a wide range of organic compounds. One of the most important factors influencing the reactivity and stereoselectivity of carbenes is the geometry of the substrate molecule. Here, we will discuss the reactions of carbenes with trans-2-butene and cis-2-butene, and the effect of inert gases on the stereospecificity of these reactions.

Trans-2-butene and cis-2-butene are both alkenes that differ only in the spatial arrangement of their substituent groups. Trans-2-butene has two methyl groups on opposite sides __________ _____ _________ _______ ______ ____.
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