Kurt Alder (10 July 1902 – 20 June 1958) was a German chemist and Nobel laureate, who received the 1950 Nobel Prize in Chemistry which he shared with his teacher Otto Diels for their work on what is now known as the Diels–Alder reaction.
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"When a mixture of 1,3-butadiene and ethene is heated in the gas phase, a remarkable reaction takes place in which cyclohexene is formed by the simultaneous generation of two new carbon – carbon bonds. This is the simplest example of the Diels-Alder reaction, in which a conjugated diene adds to an alkene to yield cyclohexene derivatives. The Diels-Alder reaction is in turn a special case of the more general class of cycloaddition reactions between psystems, the products of which are called cycloadducts."