Aus den Phenylessigsäureaniliden (I) werden über die Amide (II) die Diaryl‐tetrahydroisochinoline (III) hergestellt, die ebenso wie eine Reihe ähnlicher Verbindungen wie (lW‐(VII) werden (zum Teil IR‐.
Homophthalic acid (1) undergoes reaction with 1,2-, 1,3-, and 1,Cdiamines to give condensed 1(2H)-isoquinolinones like 2,4, 13, and 25 which exhibit marked enamine character. These are attacked by electrophiles at the N o r C terminus. Some notable reactions of imidazoisoquinolone 2 are those with maleic and acrylic acids to form the tetracycles 48 and 51, respectively. With propiolic acid, 5 underwent an interesting reaction to form the benzimidazonaphthyridine 53. An equally interesting behaviour was elicited from 2 in its reaction with formaldehyde, when in addition to the expected methylene-bridged molecule 59, the novel spiro derivative 60 was formed by the dimerisation of a presumed azadiene intermediate 63.
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