經由實驗得知在較低溫（室溫）的溫和反應條件下，給電子基“雙”取代基之 fulvenes 和 8,8-dicyanoheptafulvene 反應，主要會進行 [8+2] 環化加成反應，得到“反向”（Anti）[8+2] 環化加成生成物。我們進一步將給電子基“雙”取代基之 fulvenes 的立體障礙減小至“Me”時，我們發現給電子基“雙”取代基之 fulvenes 和 8,8-dicyanoheptafulvene 反應，主要會進行 [6+4] 環化加成反應，得到“反向”（Anti）[6+4] 環化加成生成物。因此我們更進一步將“雙”取代基之 fulvenes 的立體障礙減小為“單”取代之fulvenes 和 8,8-dicyanoheptafulvene 反應，我們認為在 60℃ 的反應條件下，會得到“反向”（Anti）[6+4] 環化加成生成物及“同向”（Syn）[4+2] 環化加成生成物。
The investigation of this research involves the intermolecular [m+n] cycloadditions of the 8,8-dicyano-
heptafulvene（8a）with electron-rich unsymmetrically 6-monosubstituted 6-phenylfulvene (1n)；designed the experimental analyses of the reactivity, diastereoselectivity, periselectivity, and regioselectivity of these cycloadditions.
The cycloaddition reaction of 8,8-dicyanoheptafulvene (8a) with 6-phenylfulvene (1n) at room temperature, we got the Anti [8+2] cycloadducts. Reduces the exo substitution to “Me”, we got the Anti [6+4] cycloadducts. We chang the exo substitution to electron-rich unsymmetrically 6-mono-substituted, we got the Anti [6+4] cycloadducts and the Syn [4+2] cyckiaddycts.
