γ‐Alkylpentamethincyanin‐Perchlorate aus 2‐Alkyl‐3‐ethoxyacroleinen

γ-Alkylpentamethinecyanine Perchlorates from 2-Alkyl-3-ethoxyacroleins Pentamethinecyanine perchlorates [γ-alkylbis(1,3,3-trimethyl-2-indolyl)- (5), γ-alkylbis (3-alkyl-1,3-benzothiazol-2-yl)- (6), and γ-alkylbis(1-ethyl-2-quinolinyl) derivatives (7), respectively] are prepared from α-C nucleophilic heterocycles 1 – 3 and 2-alkyl-3-ethoxyacroleins 4 as C3 binucleophiles. UV data are tabulated; NMR spectra are assigned.