2023年8月20日 · 本质来源就是，硼的低电负性导致的相对“抬高”的HOMO简并轨道和LUMO 2pz空轨道之间发生的能量相近的混杂，促使整个 [BH3]分子发生畸变，进而二聚成为稳定的产物。 …

The HOMO/LUMO view of chemical reactivity requires recognizing whether a particular HOMO should be unusually high in energy (basic), or a particular LUMO should be unusually low …

An example of a Lewis acid is BH 3, and an example for a Lewis base is NH 3. What happens in a Lewis-acid base reaction? The Lewis base donates an electron pair to form a covalent bond …

3 Hydrogen atoms in BH3: (Ligand group orbitals) a. Symmetry labels of LGOs:-With the symmetry operations of BH3 above, we can determine how many LGO unmoved by creating …

需要先画出反应物和产物涉及反应的所有成键轨道和反间轨道，按节点数，能量从低到高排列，然后往里面依次填充电子，找到homo和lumo，并判断其轨道对称性，将能量相近对称性相同的 …

This lecture then focuses on understanding reactivity in terms of the overlap of singly-occupied molecular orbitals (SOMOs) and, more commonly, of an unusually high-energy highest …

1994年11月20日 · Owing to the electrophilicity of the dienophile, the HOMO LUMO monotransference from butadiene to acrolein becomes predominant over that from acrolein to …

The approach is illustrated with BH 3, which is both acidic and basic and thus dimerizes by forming unusual “Y” bonds. The low LUMOs that make both HF and CH 3 F acidic are …

• What can the HOMO and LUMO tell us about the chemical nature of BH3? o the highest occupied molecular orbital or HOMO of BH 3 is a degenerate e' MO while the lowest …

For the following reactions, show (i) the HOMO-LUMO interaction and (ii) the molecular orbital interaction diagram for formation of the new molecule. A fluoride ion donates to a boron …