Photo-regulated cyclization reactions of tetraazamacrocycles with azobenzene derivatives †

Abstract

The cyclization reaction between 1 and 2 was carried out in high dilution and was photochemically regulated to give 1∶1 (29–33 membered rings, 52–55%) and 2∶2 (58–66 membered rings, 20–49%) adducts as photo-controllable compounds.

References

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9. Before starting the cyclization reaction in the dark, a solution of 1 was allowed to stand in the dark for 24 h at 30°C, or the solution was irradiated with the Hg lamp through a Y-46 filter for 2 min and allowed to stand in the dark at 30°C for 8 h. The UV spectra showed the absorption band of the trans-form rapidly reached a photo-steady state under irradiation through a Y-46 filter, but the intensity was slightly increased in the dark.