ChemInform Abstract: A New Tantalum Sulfur Compound as Electrode Material for Non-Aqueous Alkali Metal Batteries.

ChemInform ◽  
2010 ◽  
Vol 26 (12) ◽  
pp. no-no
Author(s):  
L. HERNAN ◽  
J. MORALES ◽  
L. SANCHEZ ◽  
J. L. TIRADO
Keyword(s):  
Alkali Metal ◽  
Electrode Material ◽  
Sulfur Compound ◽  
Aqueous Alkali

A new tantalum sulfur compound as electrode material for non-aqueous alkali metal batteries

1994 ◽  
Vol 39 (18) ◽  
pp. 2665-2671 ◽  
Author(s):  
L. Hernán ◽  
J. Morales ◽  
L. Sánchez ◽  
J.L. Tirado
Keyword(s):  
Alkali Metal ◽  
Electrode Material ◽  
Sulfur Compound ◽  
Aqueous Alkali

Preparation of 2'(3')-O-phosphonylmethyl derivatives of ribonucleosides

1983 ◽  
Vol 48 (3) ◽  
pp. 778-789 ◽  
Author(s):  
Ivan Rosenberg ◽  
Antonín Holý
Keyword(s):  
Alkali Metal ◽  
Metal Hydride ◽  
Sodium Hydride ◽  
Protecting Groups ◽  
Aqueous Alkali ◽  
Subsequent Hydrolysis ◽  
Derivatives Of ◽  
Alkali Metal Hydride

Reaction of 5'-O-tritylribonucleosides I with dimethyl p-toluenesulfonyloxymethanephosphonate (III) followed by hydrolysis afforded 2'(3')-O-phosphonylmethyluridine (IIa), -cytidine (IIb) and -adenosine (IIc). With 2',5'-di-O-trityluridine (IX), this procedure led to the 3'-isomer of IIa, with 3',5'-di-O-trityluridine (X) to the 2'-isomer. 5'-O-Trityluridine (Ia) and -cytidine (Ib) were converted by reaction with iodomethanephosphonic acid and N,N'-dicyclohexylcarbodiimide into the 2'(3')-O-iodomethanephosphonyl derivatives IVa, b which on reaction with sodium hydride and subsequent hydrolysis gave the compounds IIa and IIb. Reaction of compound I or 5'-O-benzoyluridine (VIII) with chloromethanephosphonyl dichloride (V) and removal of the protecting groups afforded 2'(3')-O-chloromethanephosphonylribonucleosides VI which on reaction with sodium hydride, or better with aqueous alkali, gave 2'(3')-O-phosphonylmethyl derivatives of uridine (IIa), cytidine (IIb), adenosine (IIc) and guanosine (IId). 2',3'-O-Isopropylideneribonucleosides XI reacted with the compound V to give, after hydrolysis, 5'-O-chloromethanephosphonyluridine (XIIa) and cytidine (XIIb). These compounds were not affected by an alkali metal hydride or hydroxide.

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