Download Fieser and Fieser's Reagents for Organic Synthesis (Vol. 13) by Mary Fieser PDF

By Mary Fieser

Reagents for natural Synthesis This greatly revered reference has been mentioned to this point with the ebook of quantity thirteen. millions of entries summary crucial details on standard reagents from 1966 via mid-1986. each reagent mentioned comprises the training, makes use of, assets of offer, serious reviews, references, and more.Volume 119671,475 pp.Volume 21969538 pp.Volume 31972401 pp.Volume 41974660 pp.Volume 51975864 pp.Volume 61977765 pp.Volume 71979487 pp.Volume 81980602 pp.Volume 91981596 pp.Volume 101982528 pp.Volume 111984669 pp.Volume 121986643 pp.

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Example text

Figure 11a shows the same chromatogram on TLC silica gel 60 material, both photographed under 254-nm UV light before derivatization with the Neu’s reagent. This example confirms the improvement in the separation efficiency by changing from TLC to HPTLC precoated layers. Figure 11: see Photograph Section. The newly introduced HPTLC-LiChrospher® Si 60 F254s precoated plates in many cases show a still better separation efficiency than the HPTLC silica gel 60 precoated plates. For example, Fig. 12a (HPTLC silica gel 60) and Fig.

These packages, protected in this way, are taken from the store or the TLC storage cabinet. Although the cardboard carton and styrofoam packaging are easy to remove (Fig. 16a,b), many fingernails have been broken opening the packages. Practical Tip: When opening the cardboard carton, use scissors or a screwdriver as a tool. The plastic film can then be opened using a laboratory scalpel in two ways: either the plates are left in the styrofoam container and the top film is cut twice diagonally, enabling the plates to be removed (Fig.

It is also to be recommended for stability testing and in trace analysis. g. raw materials testing, prewashed plates should always be used, as a dirty front would otherwise appear at the height of the substance zones under investigation (Fig. 19a,b). Figure 19: see Photograph Section. Prewashing is performed either by dipping (once or twice, using dipping times in the range 1–7 min) or by blank chromatography of the plate [16]. If dipping is performed over shorter time periods a uniform layer is certainly obtained, but the desired cleaning effect is often not as good.

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