Select efficiency

Fluoride Removal Efficiencies Selected Aluminum Industry Primary and Secondary Control Systems... 

Zinc chloride was used as a catalyst in the Friedel Crafts benzylation of benzenes in the presence of polar solvents, such as primary alcohols, ketones, and water.639 Friedel-Crafts catalysis has also been carried out using a supported zinc chloride reagent. Mesoporous silicas with zinc chloride incorporated have been synthesized with a high level of available catalyst. Variation in reaction conditions and relation of catalytic activity to pore size and volume were studied.640 Other supported catalytic systems include a zinc bromide catalyst that is fast, efficient, selective, and reusable in the /wa-bromination of aromatic substrates.641... 

In conclusion, the formation of spiro-aziridine only showed efficient selectivity with furan from derivatives. Following a three-step sequence, the (R)-and (5)- spiro-aziridines were prepared in 73% and 30% yield, respectively. Further steps using a N-ortho-nosyl activation/protection system afforded the corresponding endo-spiro-OZTs in overall 20% and 41%, respectively. 

Efficient selective protection of C-6 hydroxyls by acylation can be achieved by lipases91,92 or proteases like subtilisin.75,92,93... 

In our laboratories, we have found that PdI2, in conjunction with an excess of iodide anions, constitutes an exceptionally efficient, selective and versatile catalyst for promoting a variety of oxidative carbonylation processes, leading to important acyclic as well as heterocylic carbonyl compounds. 

Effect OF Efficiency, Selectivity, and Retention on Separation Time... 

It is assumed that the reader is familiar with such common chromatographic concepts as efficiency, selectivity, capacity factors, and theoretical plates, and how these parameters affect and effect chromatographic resolution. Excellent descriptions of these general chromatographic principles have been published. Other reviews on various aspects of carbohydrate separations will be cited in the appropriate Sections. 

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