Group 13 The Boron Family

Group 13 The Boron Family 21-5 Group 14 The Carbon Family... 

Group 13 The Boron Family—Group 13 contains one nonmetal, B, and the metals Al, Ga, In, and Tl. Boron compounds are often electron deficient (fewer than... 

Group 3A(13) The Boron Family 432 How the Transition Elements Influence... 

Transition from the tropylium ion 3 to its neutral heteroaromatic counterparts is possible by replacement of a CH+ group by a heteroatom with a vacant p orbital. The latter effectively accepts Jt-electrons, thus providing ring-electron delocalization. A typical example is the boron atom in l//-borepine 11 <1992AGE1255>. Correspondingly, this type of heteroatom can be referred to as borepine-like. Other little-known representatives of this family are alumopine 12 and gallepine 13. 

Boron is the first element in Group 13 (IIIA) of the periodic table. The periodic table is a chart that shows how the chemical elements are related to each other. The elements in this group are usually referred to as the aluminum family. 

Boron (B) heads the third family of main-group elements, but its properties are not representative, as the Group 3A(13) Family Portrait shows. Metallic aluminum (Al) is more typical of the group, but its great abundance and importance contrast with the rareness of gallium (Ga), indium (In), and thallium (Tl). 

What type of compounds will be covered in this overview. Strictly, only compounds which have at least one metal-carbon bond (with the exception of metal carbides) are called organometaiiic. However, this definition was not adopted in this chapter because many families of compounds that are relevant in organometaiiic chemistry would not be included (e.g., alkoxides). By metal we mean any element from groups 1 (except hydrogen), 2, 3 (including lanthanides and actinides), 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 (except boron), 14 (except carbon and silicon), and 15 (antimony and bismuth only). Most of the available thermochemical data for all these species are freely available in a single on-line database the NIST Chemistry WebBook Unless stated otherwise, all the data included in this chapter were quoted from that reference. 

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