Main-group multiple bonds
Tokitoh, Norihiro Institute for Chemical Research, Kyoto University, Kyoto, Japan.
- Multiple-bond compounds of the heavier main-group elements
- Heavy acetylenes
- Activation of small molecules with heavy acetylenes
- Links to Primary Literature
- Additional Readings
The valence orbitals of the main-group elements (groups 1, 2, and 13–18) are fully occupied or have empty s and p orbitals, while those of the transition metals are dominated by the presence of d orbitals, in addition to s and p orbitals. It is well accepted that the main-group elements usually have relatively strong covalent bonds using s and p orbitals compared with the transition metals, which form highly ionic chemical bonds. As a result, compounds of the main-group elements show relatively low reactivity compared to transition metals, and very few examples are known of the activation of small molecules (such as those bearing HH, CH, or CO bonds) with compounds of the main-group elements, in contrast to the rich chemistry of the transition metals.
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