Dehydroabietinsäure (Ia) wird unter Ausnutzung der Isopropylgruppe zur Anglie‐derung des D‐Ringes z.B. über (IIa)‐(IId) sowie (III) in die Steroid‐Verbindungen (IVa), (IVb) , (Va) und (Vb) übergeführt.
and weigh'' technique. A 5 ft X 0.25 in. 15% XF-1150 on 60/80 Chromosorb W column gave overall satisfactory separation of the major products except for the insertion products (2, 3, and 4) which gave a broad, long-retention peak. However, a 5 ft X 0.25 in. 10% QF-1 on 60/80 Chromosorb W was needed to achieve good separation of 5 from 6.Products 5 and 6 were identified by comparison of retention times with those of and coinjection with authentic samples. Products 1, 2, 3, and 4 were identified by collection from the gas chromatograph and comparison of nmr and ir spectra with published data.4 To obtain calibration factors to correct for differences in detector sensitivity, it was assumed that products 1,2,3, and 4 (isomers) have the same sensitivity. The relative ratios given are therefore corrected for the differences in detector sensitivity for 6 and 5 and 1, 2, 3, and 4.
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