Abstract
An unusual reactivity of Rh(II) carbenes generated from (E)-3-(2-pyridylmethylene)-4-diazopyrrolidine-2,5-diones was discovered which led to a novel type of fluorescent annelated indolizines (X-ray confirmed structure). The reaction was found to be insensitive to substitution pattern at pyrrolidine nitrogen atom and delivered a series of nine novel indolizines in 74–94% yields. Photophysical properties of obtained indolizines were investigated, which proved them to be blue or green luminophores with absolute quantum yields up to 13.8%. The latter strongly depended on substitution pattern at pyrrolidine nitrogen atom.
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