Definition of Diels–Alder reaction in English:

Diels–Alder reaction

Syllabification: Diels–Al·der re·ac·tion
Pronunciation: /ˌdēlzˈôldər rēˌakSH(ə)n
 
/

noun

Chemistry
An addition reaction in which a conjugated diene reacts with a compound with a double or triple bond so as to form a six-membered ring.

Origin

1940s: named after Otto Diels (1876–1954), and Kurt Alder (1902–58), German chemists.

Definition of Diels–Alder reaction in:

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Pronunciation: dɪˈmɒrəlʌɪz
verb
cause (someone) to lose confidence or hope