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A series of new chiral [1+1] macrocyclic Schiff bases have been synthesized in high yields and short reaction times from cyclocondensation of dialdehydes with long tethers and chiral diamines. The yields of the macrocycles were higher when the dialdehyde component is also chiral. The macrocyclisation was performed under microwave irradiation and aqueous reaction conditions employing salts of chiral diamines in contrast to free diamines normally employed.

Key indicatorsSingle-crystal X-ray study T = 293 K Mean (C-C) = 0.010 Å Disorder in main residue R factor = 0.066 wR factor = 0.202 Data-to-parameter ratio = 9.3For details of how these key indicators were automatically derived from the article, see