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Heterophenes have contributed a great deal to the progress of π-conjugated systems such as benzenoid and quinoid compounds. Introduction of heterophenes in place of benzenoid or benzoquinoid structures in π-conjugated systems often leads to improvement of properties and stability as well as facile synthesis. In recent studies on phosphorus compounds, heterophenes such as thiophene and selenophene...
This chapter deals with the methods for the syntheses of 2,5-dihydro-1,2-oxaphosphole-2-oxide derivatives, and some recent results of their biological activity testing. The electrophilic addition to 1,2-alkadiene- and alkatrienephosphonate derivatives is one of the easiest and fruitful synthetic strategies for obtaining these compounds in preparative amounts.
This chapter gives a survey on five- and six-membered phosphorus–nitrogen heterocyclic compounds whose rings combine a phosphazene (>N–P = N–) or phosphazane (>N–P(X)–N<) unit with an unsaturated C2 or C3 building block. Representatives contain structurally diverse species like aromatic 1,3,2-diazaphosphinines and (benzo)-1,3,2-diazaphospholes, cationic counterparts of subvalent main-group...
This review presents the synthesis of selected five-membered phosphorus heterocycles containing a stereogenic phosphorus in an optically active form. Their utility in a few asymmetric reactions is also briefly mentioned.
The 1H-phospholes with a 2,4,6-trialkylphenyl substituent on the phosphorus atom synthesized in our laboratories are of aromatic character due to their flattened P-pyramid. Hence, they may undergo aromatic electrophilic substitution, such as Friedel–Crafts acylations. The arylphospholes were functionalized via the regioselective reaction with phosphorus tribromide to give substituted phospholes that...
Diazaphospholes, incorporating two nitrogen atoms (one σ3,λ3 and the other σ2,λ3) in addition to a σ2,λ3-phosphorus in the five-membered ring, constitute a well-investigated category of heterophospholes. Possibility of different combinations of three heteroatoms has made available a number of representatives through different synthetic routes. In this chapter, an account of the reports on the chemistry...
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