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The constitution of amide chlorides and reaction products of amides with phosphoroxychloride is discussed. Based on infrared spectra and reaction behaviour an ionized constitution is proposed. The mechanism of VILSMEIER's aldehyde synthesis is studied. Under certain conditions this reaction can be extended to the synthesis of ketones.

Irradiation of santonin in dioxan solution or in alcohol yields a new isomer, lumisantonin, which in turn has been correlated with 3 known compounds: photosantonin, photosantonic acid and isophotosantonic acid lactone. The chemistry of lumisantonin is interpreted in terms of structure b.