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Benzoxazoles, benzthiazoles and benzimidazoles can be rapidly and efficiently synthesized in excellent yields by condensing a variety of carboxylic acids with 2-aminophenol, 2-aminothiophenol and 1,2-phenylenediamines under ambient conditions using the ionic liquid 1-butyl 3-methyl imidazolium tetraflouroborate [(bmim)BF 4 ] at higher temperatures.

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meso-Substituted porphyrins are synthesised from pyrrole and aryl, heteryl aldehydes cleanly and efficiently in one step by reactions at temperatures 100 °C in ionic liquid using air as oxidant.

meso-Tetrakis (-2-chloroquinolin-3-yl) porphyrins were synthesized from 2-chloroquinoline-3-carboxaldehydes and pyrrole in 1:1 ratio in propionic acid at 140 o C for 4 hours. Different substituted 2-chloroquinoline-3-carboxaldehydes were synthesized from corresponding N-aryl acetamides by Vilsmeier-Haack cyclization. The aldehydes were obtained in better yields, when acetamides, dimethyl formamide and POCl 3 were taken in 1:3: 7 molar ratios at 70-75 o C