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Three-coordinate pentavalent phosphorus compounds can no longer be considered as exotic species in phosphorus chemistry. Since their discovery in 1974 hundreds of stable σ 3 λ 5 -phosphoranes have been synthesized and thoroughly investigated. Early work concentrated on preparation, stability and structure of various structural types of monomeric X-P(=Y)=Z compounds. More recently...
New synthetic methods for the preparation of pentadienylium cations (cyanine dyes) are developed in our laboratories. In particular the reaction of carboxonium derivatives on various primary and secondary amines is to be emphasized. This method is remarkably versatile to lead to new dyes hardly obtainable otherwise. It is applied here to the synthesis of previously unknown derivatives of N-silylated...
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