Florisil chromatographic absorbent

The exchange of D20 with a variety of hydrido-metal complexes is discussed. While the exchange of HRe(CO)s with D20 is rapid, that of a variety of hydrido-metal cluster complexes is not observed. The exchange ofD20 with H2Re2(CO)s or H2Os3(CO)l0 on the other hand is found to be catalyzed by Florisil chromatographic absorbent. Mass and Raman spectrometric means of characterization are discussed. 

Hydrogen-Deuterium Exchange of H20s C0) q and H Ee CO) on Florisil Chromatographic Absorbent... 

The fractionation technique for unsaponifiable components, always based on chromatographic methods, has recently been greatly improved. Because of the complex composition of most unsaponifia-bles studied, several steps are required before compounds are sufiS-ciently pure to enable their identification directly by traditional chemical means, or by spectrographic methods. The method giving the best results, especially preparative, consists of a series of adsorption chromatographies on silica or alumina columns or, less frequently, on Florisil or other inert adsorbents. The use of ionic absorbents (DEAE and TEAE) or of exchange-resins offers no advantage. 

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