Process for preparing alkylpyrylium salts

Details Process for preparing alkylpyrylium salts Process for preparing alkylpyrylium salts

1978-11-14

1980-09-09

Breitenstein, G. T.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

546253, 546250, C07D30934, C07D21318

Patent

active

042217229

ABSTRACT:
A process for preparing polyalkylpyrylium salts comprising a polyalkylpyrylium cation, wherein the pyrylium nucleus is substituted by 3 to 5 alkyl substituents three of which are situated in the 2-, 4- and 6-position is disclosed which comprises the step of reacting a branched alkane comprising at least one tertiary carbon atom with an acylating agent which is a reactive alkylcarboxylic acid derivative and an alkyl halide in the presence of a Lewis acid catalyst selected from the group consisting of aluminum halides, ferric halides and mixtures thereof.

REFERENCES:
patent: T900031 (1972-07-01), Petropoulos et al.
patent: 3148067 (1964-09-01), Reynolds
patent: 3250615 (1966-05-01), Van Allen et al.
Balaban et al., J.A.C.S., pp. 3553-3561 (1961).
Hopff et al., Ber. 69, 2244-2251 (1936).
Balaban, Advances in Heterocyclic Chem., vol. 10, pp. 214-326 (1969).
Van Allan et al., Chem. Absts., 63, 10102(d), 1965.
Krivun et al., Russ. Chem. Rev., 43, 835-850 (1974).
Balaban et al., Ann., 625, pp. 74-88 (1959).

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