Trialkyl‐phosphit (II) liefert in siedendem Benzol mit Acridin‐hydrochlorid(I) mit 70% Ausbeute Dialkyl‐9,10‐dihydroacridyl‐9‐phosphonat (III), das sich mit Chloranil in Benzol zu Dialkyl‐acridyl‐9‐phosphonat (IV) dehydrieren (65%) und in siedender Salzsäure zu (V) verseifen läßt (55%).
Zu einer Suspension von tert.‐Kaliumbutylat in Äther gibt man bei ‐30°C unter Stickstoff ein absolut trockenes Pyranyltriphenylphosphoniumsalz ( ;z.B. Perchlorat) (I).
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