Hydrolysis spectroscopic analysis

Triphosphine, P3H5, has been identified as a product from the hydrolysis of CaaPj or Mg3P2 in acidic media by mass spectroscopy In addition, using mass spectroscopic analysis Baudler and her co-workers 436.437) able to identify the following higher phosphines formed during the hydrolysis or the disproportionation of diphosphine ... 

The key alkaloid of the dihydroperiphylline group is periphylline (138), on which intensive chemical and spectroscopic analysis was performed. Essential to the structure determination was the detection of spermidine in an alkali melt of tetrahydroperiphylline (139), prepared by catalytic hydrogenation of periphylline (138). Alkali hydrolysis of 138 yielded ( -cin-... 

Holarrhesine an ester-base found in the bark of H. flori-hunda, is formulated as (20) chiefly on the basis of spectroscopic analysis and because of its facile hydrolysis to the known holarrheline (21) (G. A. Hoyer et at., Planta Med., 1978, 34, 47). 

Why is Ce(IV) so active for DNA hydrolysis What factors differentiate this metal ion from other lanthanide ions and non-lanthanide ions Do the f-oibitals of Ce(IV) take significant roles in the catalysis These questions are critically important for practical applications of this catalysis and also from the viewpoints of pure rare earth chemistry. In order to answer them, core-level photoelectron spectroscopy (Shigekawa et al., 1996), as well as EXAFS (extended X-ray absorption fine structure) and XANES (X-ray absorption near edge stracture) measurements (Shigekawa et al., 1999), were carried out. The spectroscopic analysis was simplified by using diphenyl phosphate (DPP) in place of DNA, and the EXAFS and the XANES measurements were carried out on the samples frozen in liquid nitrogen. 

In 1998, six novel spirostanol saponins and five novel furostanol saponins were confirmed from the fresh imderground parts of Ruscus aculeatus L. by spectroscopic analysis, nuclear magnetic resonance spectrometry (NMR) and acid hydrolysis. 

These complexes anchored to a solid via a ligand have been tested for a number of reactions including the hydrogenation, hydroformylation, hydrosilylation, isomerization, dimerization, oligomerization, and polymerization of olefins carbonylation of methanol the water gas shift reaction and various oxidation and hydrolysis reactions (see later for some examples). In most cases, the characterization of the supported entities is very limited the surface reactions are often described on the basis of well-known chemistry, confirmed in some cases by spectroscopic data and elemental analysis. 

Cuscutic resinoside A (1 tetradecanoic acid, (115)-[[6-deoxy-3-(9-(6-deoxy-a-L-mannopyranosyl)-4-0-[(2/ ,3R)-3-hydroxy-2-niethyl-l-oxobutyl]-a-L-nianno-pyranosyl]oxy]-intramol. l,2 -ester) was obtained from the ethyl acetate-soluble fraction of a methanol extract prepared from the seeds of Cuscuta chinensis Lam. The purification of this compound employed a combination of column and preparative-scale HPLC. The structure was deduced from spectroscopic evidence and acid hydrolysis 14). The degradative process gave convolvuUnolic acid, nilic acid, and L-rhamnose. The sugar components were identified by GC analysis after being converted to their thiazolidine derivatives. This disaccharide has a unique macrocyclic lactone, which is placed between C-1 and C-2 of the first rhamnose moiety. 

---