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%).

Glasses in the Sb 2 S 3 -PbI 2 system are synthesized, and their physicochemical properties are investigated. The glasses possess high refractive indices (up to 3 or greater). The phase diagram of the Sb 2 S 3 -PbI 2 system is constructed from the data of differential thermal and X-ray powder diffraction analyses. The diagram exhibits an eutectic behavior. The eutectic is located at a content of 47 mol % PbI 2 and at a temperature of 370 ± 5 ° C.

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