journal article
LitStream Collection
Home
Ahluwalia, V.; Mehta, A.; Seshadri, T.
doi: 10.1007/BF03052569pmid: N/A
The position of the methoxyl group in dalbergin has been established by synthesis using two methods: (1) partial methylation of 4-phenyl-aesculetin and (2) nuclear oxidation of 4-phenyl umbelliferone methyl ether. By similar methods the 7-benzyl ether of 4-phenyl aesculetin and from it by methylation and debenzylation iso-dalbergin has been prepared. The ethyl ethers of dalbergin and iso-dalbergin have also been obtained.
doi: 10.1007/BF03052570pmid: N/A
(1) Uranium is separated from thorium and rare earths from solutions containing as little as 0·45 g. U3O8/litre and U3O8/ThO2+Rare earth oxides =0.·1 if the pH of the solution before adding KF or NH4F is about 3, or less. (2) Uranium is separated from iron in the pH range of 6 to 6·5 in solutions containing 0·45 g. U3O8/litre and U3O8/Fe2O3=1·0. (3) Complete separation of iron from uranium is achieved only after washing the peroxy complex of uranium with a large volume of water.
doi: 10.1007/BF03052571pmid: N/A
Gum karaya (Sterculia urens Roxb.) is constituted from L-rhamnose, D-galactose and D-galacturonic acid which appear to be present in the molecular ratio of 4∶6∶5. D-tagatose, which has been reported to be present in other Sterculia gums, could not be detected in the sample of the karaya gum now examined. The original crude gum contains some acetyl groups also, which get detached during purification.
doi: 10.1007/BF03052572pmid: N/A
A procedure for the separation of carrier-free Sn113 from deuteron bombarded indium is described. The method employed depends on the extraction of stannic cupferrate from mineral acid solution using carbon tetrachloride, followed by ignition of the complex.
Showing 1 to 9 of 9 Articles