The diastereoselectivity of the addition was found to be remarkably sensitive to the structure of the phosphoramide promoter. The results of the uncatalyzed reaction are reiterated to recall a 49/1 selectivity favoring the syn diastereomer. When the reactions are promoted by a catalytic amount of ...
Tungsten nitride films were deposited on heated substrates by the reaction of vapors of tungsten bis(alkylimide)bis(dialkylamide) and a Lewis base or a hydrogen plasma. For example, vapors of tungsten bis(tert-butylimide)bis(dimethylamide) and ammonia gas supplied in alternate doses to surfaces...
The results showed that aromatics yield can be improved by the reduced transport resistance of the mesoporous structure, and by non-framework Lewis acidic Al species as well. 2. Results and Discussion Table 1 lists the porosities of the tested catalysts. The total surface area, the micropore ...