In retrosynthetic analysis, a synthon is a hypothetical unit within a target molecule that represents a potential starting reagent in the retroactive synthesis of that target molecule. The term was coined in 1967 by E. J. Corey. He noted in 1988 that the "word synthon has now come to be used to mean synthetic building block rather than retrosynthetic fragmentation structures". It was noted in 1998 that the phrase did not feature very prominently in Corey's 1981 book The Logic of Chemical Synthesis, as it was not included in the index. Because synthons are charged, when placed into a synthesis
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合成子（英语：Synthon）是逆合成分析中的概念之一，用以表示拆解有机合成目标分子时得到的碎片，即合成反应可能经由的途径。该概念首先由艾里亚斯·詹姆斯·科里提出，但其所著的《化学合成的逻辑》（The Logic of Chemical Synthesis）一书中并未十分强调该概念。 极性转换中的合成子可分为供电子合成子（以d代表）和受电子合成子（以a代表）两大类。典型的d合成子如甲硫醇、氰化钾、乙醛、炔烃锂盐等，而a合成子如、丙酮、溴代丙酮及丙烯酸酯。
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