Several tricyclic benzopyrano[4,3-c]pyrazole derivatives have been studied by 1H and 13C n.m.r. spectroscopy. They were prepared by treating 3-benzylidene-chromanones and -1-thiochromanones with semicarbazide or thiosemicarbazide: reactions which give only the cis 3-H,3a-H stereoisomers.
|Number of pages||5|
|Journal||Journal of the Chemical Society, Perkin Transactions 2|
|Publication status||Published - Dec 1 1989|
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