The catalyst is a twisted chair structure and reacts with borane at the N site of the catalyst to form catalyst borane adduct. The formation reaction is exothermic.
催化剂具有扭曲的椅式构型，与硼烷在N原子处配位形成加合物，反应是放热的。
This chair first introduces the structure and types of optical fiber, then describes transmission principle, characteristics and application of optical fiber.
首先介绍光纤结构和类型，然后阐述光纤传输的原理、特性和应用。
When the goods box is not used, the foldable goods box for the chair in the structure can be folded so as to save space.
该结构的椅子可折叠的物品箱，若不使用物品箱时可将其折叠起来，减小所占空间。
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