# What is C2H5-O-CH=CH2?

Someone painted an original graffiti:

source

I wonder what kind of reaction was depicted; what's that product substance?

The graffiti reads: $\ce{C2H2 + C2H5OH -> C_2 H_5 - O - CH = CH_2}$

Does it have any more or less common uses?

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The particular reaction is of acetylene ($\ce{C2H2}$) and ethanol ($\ce{C2H5OH}$) to yield ethyl vinyl ether (IUPAC name ethoxyethene). It's one example of Reppe chemistry, a fairly diverse set of reactions, often operating on alkenes and alkynes (though certainly not exclusively). The specific reaction in the question is a vinylization reaction, though it was Reppe's carbonylation reactions which were probably of greater practical (read: economic) import historically, as they were famously used in the Monsanto process and in production of various acrylates and other acrylic acid derivatives.