Heterocalixarenes Part 4. Synthesis of oxocalix [1] heterocycle [2] arenes: a unique H-bonding network in calix [1] benzimidazol-2-one [2] arene· 12 H2O

S Kumar, G Hundal, D Paul, MS Hundal…

Index: Kumar, Subodh; Hundal, Geeta; Paul, Dharam; Singh Hundal, Maninder; Singh, Harjit Journal of the Chemical Society, Perkin Transactions 1, 2000 , # 14 p. 2295 - 2301

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Citation Number: 2

Abstract

The Friedel–Crafts aroylation of 2-methylanisole with 3-methylbenzoyl chloride followed by NBS bromination and cyclizations with 1,3-dihydrobenzimidazol-2-one, 1,3-dihydro-5,6-dinitrobenzimidazol -2-one, uracil, 6-methyluracil and quinazoline-2,4(1H,3H)-dione provide respective oxocalix[1]heterocycle[2]arenes 5–9. The X-ray crystal structure (solid) and 1 H NMR spectral (solution) studies show them to have by and large inwardly flattened partial cone ...