References
- Stetter , H. 1973 . Angew. Chem. , 85 : 89 Angew. Chem. Int. Ed. Engl. 12, 81 (1973); and subsequent papers.
- Ho , T.-L. 1974 . Synth. Commun. , 4 : 265
- Strunz , G. M. 1983 . J. Agri. Food Chem. , 31 : 185 T.-L. Ho, S-H. Liu, Synth. Commun. 13, (1983)
- Stetter , H. and Schlenker , W. 1980 . Tetrahedron Lett. , 21 : 3479
- Catalytic activity of poly(4-methyl-5-vinyl-l,3-thiazolium salts) was mentioned in ref. 1. However, their preparation, efficiency in promoting the condensation, and experimental details are lacking.