Color reactions between trialkylamines and naphthoquinones

Sodium 1,2-naphthoquinone-4-sulphonate (1) reacts with trialkylamines 6a, b by N-desalkylation to give red colored 4-di-alkyamino-1,2-naphthoquinones 3a, b. N,N-Diethylaniline (6f), a phenylogous amine, reacts with 1 to form the blue colored 4-(diethylamino-phenyl)-1,2-naphthoquinone (8). 2,3-Dihalo...

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Bibliographic Details
Published in:	Pharmazie Vol. 57; no. 7; p. 456
Main Authors:	Kallmayer, H J, Thierfelder, B
Format:	Journal Article
Language:	German
Published:	Germany 01-07-2002
Subjects:	Alkynes - chemistry Amines - chemistry Color Coloring Agents - chemistry Dealkylation Indicators and Reagents Naphthoquinones - chemistry
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Summary:	Sodium 1,2-naphthoquinone-4-sulphonate (1) reacts with trialkylamines 6a, b by N-desalkylation to give red colored 4-di-alkyamino-1,2-naphthoquinones 3a, b. N,N-Diethylaniline (6f), a phenylogous amine, reacts with 1 to form the blue colored 4-(diethylamino-phenyl)-1,2-naphthoquinone (8). 2,3-Dihalogeno-1,4-naphthoquinones 15A/B produce with triethylamine (6a) the red N-desalkylation products 17A/Ba and the blue colored dehydrogenation products 18A/B. The reactions from trialkylamines 6b-g indicate that only ethyl functions may be dehydrogenated. 2,3-Dihalogeno-1,4-naphthoquinones 15A/B form with N,N-Diethylaniline (6f) blue violet colored CT-complexes and with diethylcyclohexylamine (6g) only blue colored 2-aminovinyl-3-halogeno-1,4-naphthoquinones 20A/B.
ISSN:	0031-7144