Oxygenation amino

These compounds contain two or more cobalt atoms in the molecule linked together by oxygen, amino- or hydroxvl-groups, or by more than one of these groups. 

It "has been proved that in those compounds cobalt atoms are never linked directly to one another, but always through oxygen, amino-,... 

Whereas carbohydrates and fat fuels contain only the elements carbon, hydrogen and oxygen, amino acids also contain nitrogen. Therefore, the first step in amino acid catabohsm is the... 

Early studies on RE(III)-neutral amino acid and RE(III)-basic amino acid systems (14 neutral amino acids Gly, Ala, Val, He, Leu, Pro, Trp, Tyr, Met, Ser, Thr, Cys, Asn, and Gin and three basic amino acids His, Lys, and Arg ) indicate that they form only 1 1 and 1 2 (RE L) mononuclear species [REL] + and [REL21+, withlogPi around 4-6 and log P2 around 6-8. Compared with the corresponding RE(III) complexes with acetic acid (log Pi = 1.53 log P2 = 2.44 pffa = 4.56) (Table 3.1), a substantial increase in the complex stability is observed for all of the RE-amino acid complexes, indicating chelation between the carboxylato-oxygen, amino-nitrogen, and the RE(III) cations. Meanwhile, thermodynamic parameters and NMR studies showed that the -OH groups in Ser and Tyr are involved in the coordination of their... 

Similarly, oxygenated amino groups in primary syntheses of quinazolines and perimidines yield the corresponding A-oxides. 

This review describes rearrangements of aUyUc esters bearing oxygen, amino and sulfur substituents in the a- or jS-position of the acid moiety. In principle, chelate formation can also be proposed in the rearrangement of j8-ketoesters, but this so-called Carrol rearrangement is described in Chapters. 

Because large proteins, such as enzymes, are colloids, they remain inside cells. However, many of the substances that must be obtained by cells, such as oxygen, amino acids, electrolytes, glucose, and minerals, can pass through cellular membranes. Waste products, such as urea and carbon dioxide, pass out of the cell to be excreted. 

The molecule is built up of 1b amino acids, but the file also contains the positions of the oxygen atoms of 12 water molecules contained within the unit cell. To keep the example simple, only the most important parts of the file are presented and discussed here. Each part of the file is annotated with corresponding row and column numbers. The complete file can be obtained from the PDB [53] or from this book s website [153],... 

Typical auxochromes are hydroxyl, alkoxyl and aroxyl, amino, alkyl-amino and arylamino, all of which promote conjugation with lone pairs on oxygen or nitrogen atoms. 

The 4-hydroxy-1-alkene (homoallylic alcohol) 81 is oxidized to the hetni-acetal 82 of the aldehyde by the participation of the OH group when there is a substituent at C3. In the absence of the substituent, a ketone is obtained. The hemiacetal is converted into butyrolactone 83[117], When Pd nitro complex is used as a catalyst in /-BuOH under oxygen, acetals are obtained from homoallylic alcohols even in the absence of a substituent at C-3[l 18], /-Allylamine is oxidized to the acetal 84 of the aldehyde selectively by participation of the amino group[l 19],... 

Xanthene dyes are those containing the xanthylhim [261-23-4] (la) or diben2o-y-pryan nucleus [92-83-1] (xanthene) (lb) as the chromophore with amino or hydroxy groups meta to the oxygen as the usual auxochromes. They are... 

Reaction with Oxygen Nucleophiles. In the presence of strong acids, eg, H2SO4, HBF, or BF, aziridines react with alcohols to form P-amino ethers (93) ... 

Chemiluminescent Immunoassay. Chemiluminescence is the emission of visible light resulting from a chemical reaction. The majority of such reactions are oxidations, using oxygen or peroxides, and among the first chemicals studied for chemiluminescence were luminol (5-amino-2,3-dihydro-l,4-phthalazinedione [521-31-3]) and its derivatives (see Luminescent materials, chemiluminescence). Luminol or isoluminol can be directly linked to antibodies and used in a system with peroxidase to detect specific antigens. One of the first appHcations of this approach was for the detection of biotin (31). 

---