Synthesis and Diastereoselective Structural Change of a Photochromic Transition Metal Complex, (η^6-Spirobenzopyran)(tricarbonyl)chromium
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Photochromic transition metal complexes, (η<SUP>6</SUP>-spirobenzopyran)Cr(CO)<SUB>3</SUB>, were synthesized and the structure was determined by an X-ray crystallographic and <SUP>1</SUP>H NMR measurements. The ring formation during its synthesis and ring-closing reaction during and after UV irradiation proceeded diastereselectively to let chromium atom and oxygen atom of the pyran ring locate on the same side of the indoline ring.
- Chemistry Letters
Chemistry Letters 1997(10), 965-966, 1997-10
The Chemical Society of Japan