4.8 Review

Lewis pairing and frustration of group 13/15 elements geometrically enforced by (ace)naphthalene, biphenylene and (thio)xanthene backbones†

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CHEMICAL SOCIETY REVIEWS
卷 50, 期 9, 页码 5777-5805

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ROYAL SOC CHEMISTRY
DOI: 10.1039/d0cs01259a

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  1. Centre National de la Recherche Scientifique
  2. Universite de Toulouse
  3. Agence Nationale de la Recherche

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This review discusses the synthesis, structure, and reactivity of mixed group 13/group 15 compounds featuring a rigid backbone, as well as the importance of the backbone in enforcing or preventing interactions between the two groups.
The synthesis, structure, and reactivity of mixed group 13/group 15 compounds (E-13 = B, Al, Ga, In, Tl; E-15 = N, P, Sb, Bi) featuring a rigid (ace)naphthalene or (thio)xanthene backbone are discussed in this review. The backbone may either enforce or prevent E-15 -> E-13 interactions, resulting in Lewis pairing or frustration. The formation of strong E-15 -> E-13 interactions is possible upon peri-substitution of (ace)naphthalenes. This gives the opportunity to access and study highly reactive species, as exemplified by P-stabilised borenium salts and boryl radicals. In turn, rigid expanded spacers such as biphenylenes, (thio)xanthenes and dibenzofurans impose long distances and geometrically prevent E-15 -> E-13 interactions. Such P-B derivatives display ambiphilic coordination properties and frustrated Lewis pair behaviour towards small molecules, their preorganised structure favouring reversible interaction/activation. Throughout the review, the importance of the scaffold in enforcing or preventing E-15 -> E-13 interactions is highlighted and discussed based on experimental data and theoretical calculations.

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