substituted atom 中文意思是什麼
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A novel ring - enlargement oxidation of polyphenyl substituted cyclopentadienes in air ( or molecular oxygen ) promoted by perchloric acid was described, in which an oxygen atom was inserted into the cyclopentadiene - ring, forming a six - membered pyrylium salts
摘要報導了空氣（或氧氣）存在的條件下，由高氯酸引發多苯基取代環戊二烯發生新穎的碳碳鍵斷裂擴環反應，在此反應中，氧原子插人到環戊二烯環中形成相應的六元環吡喃鹽類化合物。 -
The third position from a designated carbon atom in an organic molecule at which an atom or a radical may be substituted
第三位在有機分子中從一指定碳原子后第三個位置，在此一個原子或原子團可能被替代
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