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The reaction of the bis(enynyl)phosphanes 6 a,b with the electrophilic borane reagents RB(C6F5)2 (R=C6F5, CH2CH2Ph, CH3) gave phospholes cleanly in a 1,1‐carboboration reaction sequence. Depending on the steric bulk, the resulting 2,5‐alkenylphospholes underwent a thermally induced bora‐Nazarov type cyclization. The equilibrium situation of these examples of a bora‐Nazarov type cyclization was investigated...
Bei Raumtemperatur wandelt die starke Lewis‐Säure B(C6F5)3 Bis(arylethinyl)benzole über eine Abfolge von Lewis‐Säure‐induzierten Cyclisierungen in Dibenzopentalene um. Die Reaktion ist daher potenziell nützlich für die Synthese substituierter Dibenzopentalenderivate, die auf herkömmliche Weise schwer zu erhalten sind.
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