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279ChemInform Abstract (I) and (II) undergo Diels-Alder cycloaddition to give (III) or (IV), depending on the temperature. Both compounds are aromatized to form either (V) or (VI). The compounds (VIII) and (XVI) are obtained in a similar manner. Aromatization is also achieved in the conversion of (IX) to (VIII) and (X) to (XIII).

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Diels-Alder Reactions of P-Chloro(bistrimethylsilyl)methylene Phosphine. -The purification of cycloadducts such as (III) and (IV), which are synthesized regiospecifically, is difficult due to their instability. Starting from these compounds functionalized phosphabenzenes can be generated by a simple and general route. -(ABBARI, M.; COSQUER, P.; TONNARD, F.; KO, Y. Y. C. Y. L.; CARRIE, R.; Tetrahedron 47 (1991) 1, 71-82; Groupe Rech. Physicochim. Struct., CNRS, Univ. Rennes I, 35042 Rennes, Fr.; EN)