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布雷特规则_百度百科
布雷特规则（Bredt’s Rule）由德国化学家尤利乌斯·布雷特于1902年提出、1924年正式编纂，规定桥环化合物的桥头位置不能存在碳碳或碳氮双键，除非环足够大以减少几何应变。
www.masterorganicchemistry.com
What's Bredt's Rule? The problem with bridgehead alkenes
Sep 2, 2014 · Bredt’s Rule: Why Don’t Bridgehead Double Bonds Form? This post is all about Bredt’s Rule (1924): double bonds cannot be placed at the bridgehead of a bridged ring system.
zh.wikipedia.org
布莱特规则 - 维基百科，自由的百科全书
布莱特规则：除非环够大，否则 桥环化合物 中的桥头原子不可连有双键。 如：布莱特规则预测如下两个 降冰片烯 的异构体是不稳定的。 事实也是如此。 布莱特规则之所以存在，主要是因为在小环和中环（小于八元）中，桥头的双键有 环张力，特别是 角张力。
chem.libretexts.org
2.2: Bredt's Rule - Chemistry LibreTexts
Bredt's Rule states that bridged ring systems cannot have a double bond at the bridgehead position. Bretd’s Rule cautions us on the type of rings that could bear a double bond.
total-synthesis.com
Bredt's Rule Definition and Exceptions (Anti-Bredt Olefins) –
Bredt’s famous rule originated from his in-depth camphor studies, as he was not able to synthesize certain derivatives as planned. One of the first examples was this anhydride with a double bond at the bridged position.
www.bohrium.com
布莱特规则 | SciencePedia
布莱特规则是有机化学中的一个经验法则，它指出在桥环化合物中，双键不能形成于桥头碳原子上，因为这会导致严重的角张力和无效的p轨道重叠。 该规则对于预测双环体系的稳定性和反应性至关重要。
carbon.indstate.edu
Bredt s Rule - Indiana State
Do the equilibrium geometries exhibit any features that support increasing of the bicycloalkene in accord ring size? the increasing consistent with Bredt’s hypothesis?