Ce-group

A widely used protecting agent is 2-cyanoethanol (- 3-hydroxypropanonitrile, hy-dracrylonitrile), which is condensed with phosphates with the aid of DCC. The 2-cyanoethyl (Ce) group is quantitatively removed as acrylonitrile by treatment with weak bases (H.G. Kho-rana, 1965). 

Precipitation of sulfate in fractional crystallization Y group Y group Y group Ce group... 

Recently, the oxidative formation of the Ce group in carbohydrates has became a strong focus of investigation, since when it is applied to the starch molecule, superabsorbing material based on renewable resources can be produced. Therefore, the development of new catalytic methods for the selective oxidation of terminal alcohols Cg by applying simple and cheap oxidants such as hydrogen peroxide still remains challenging. 

Carboplatin is often substituted for cisplatin in numerous SCLC regimens and has been shown to have similar efficacy with somewhat less toxicity, particularly for patients with pre-existing renal dysfunction or severe neuropathy. In a randomized comparison of carboplatin and etoposide (CE) versus PE in patients with SCLC, the overall survival was 11.8 months for the CE group and 12.5 months for the PE group. Based on these data, PE or CE have become the most commonly used regimens to treat SCLC in the United States. 

Ce groups a un ensemble de g nerateurs en correspondance biunivoque avec les... 

MAS Ce Ce group RE [85] Cu based alloys p-nitrochlorophs - phanazo, Knsx =680nni ... 

A fundamentally different variation of the dye-primer chain termination chemistry, originally suggested by Tabor and Richardson [26], was explored by several CE groups in the 1990s. Here, relative... 

In the following paragraphs we discuss photoabsorption features of atoms, clusters and solids of some of the Sm group elements, whose 3d-4f linewidths exhibit normal behaviour in their different valence phases. This will lead us to invoke a new mechanism involving 4f-covalence to account for the unusually broad 3d-4f lines observed for Ce group dioxides. 

Theoretical understanding of mixed valence or even of the pure valence transition in the Sm-group compounds is much poorer than for compounds of the Ce group. Mixed valence in the latter group is well-understood in the framework of die Anderson impurity... 

Structural differences between Y-group and Ce-group rare earths... 

Section 3 discusses some crystal-chemical aspects of rare earth minerals. Our interest has been centered on the following two points the difference between Y-group and Ce-group rare earths and isomorphous substitution of rare earth ions with other ions. We have developed our discussion based on the knowledge obtained from the structural data. 

Gatehouse et al. (1979) reported that uranium and the Ce-group rare earth atoms independently occupy the Ml and MO sites in the crystal structure of davidite-(La), and that Y-group rare earth atoms with smaller ionic radii substitute for the uranium atoms at the Ml site. They also explained the low uranium content with high cerium and yttrium content in the sample of davidite from Norway, by the presence of the tetravalent Ce" ion with relatively small size at the Ml site. Gatehouse et al. (1979)... 

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