(chemistry) A short-lived compound that is formed temporarily in a reaction mechanism.

responsiveness to stimulation / (chemistry) relative susceptibility to chemical reaction

(politics) Favoring a return to an alleged golden age of the past; anti-progressive. / (chemistry) Of, pertaining to, participating in or inducing a chemical reaction. / In reaction to, as a result of.

(politics) One who is opposed to change and wants to reverse it, wishing for a return to an alleged golden age of the past.

The area within which something may be accessed without moving.

(chemistry) a reaction in which radicals are added to both sides of a double or triple bond

(chemistry) a reaction in which a single electron is transferred from one molecule to another; one being oxidized and the other reduced (also known as a redox reaction); long-range electron transfer reactions are important in biological reactions involving metalloproteins such as haemoglobin

(organic chemistry) The cycloaddition reaction between a conjugated diene and an alkene to form a cyclohexene ring.

Communicated as the events being responded to occur; communicated or proceeding without much delay (compare instantaneous, synchronous)

(chemistry) a substitution reaction in which an alkyl or acyl functional group replaces a hydrogen atom of an aromatic nucleus; it is catalyzed by aluminium chloride