4c, which would not crystallize: ir (neat) 3300 (NH2), 3400 (NHj), 1650 (C=0), and 1630 cm-1 (C=C); nmr (CDCls) 1.4-3.6 (m, 17, aromatic and olefinic), 2.52 (s, 2, NH2, exchanges with D20); mass spectrum m/e 34 . The oil was dissolved in ether and treated with hydrogen chloride gas to prepare the hydrochloride salt, mp 182°dec (depends upon rate of heating).
Thiophen‐3,4‐dicarbonsäure (Ia) liefert das Bis‐säurechlorid (Ib), aus dem b der Behandlung mit Benzol und Aluminiumchlorid neben dem Cyclisierung produkt (II) noch die Nebenprodukte (III)‐(V) entstehen, deren Anteile wesentlich durch die angewandten Bedingungen bestimmt werden.
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