Steric effects in the UV and IR spectra of alkyl and aryl thioureides, thioureas, and thiouracils

1970 ◽  
Vol 12 (3) ◽  
pp. 393-396
Author(s):  
K. A. Nuridzhanyan ◽  
V. G. Blinova
Keyword(s):  
Ir Spectra ◽  
Steric Effects ◽  
Uv And Ir Spectra

Spectral Investigations of the Effects of 60Co-Gamma Irradiation on Iodothyronine and Iodotyrosines

1987 ◽  
Vol 41 (1) ◽  
pp. 74-79
Author(s):  
A. Obaid ◽  
S. Basahl ◽  
A. Diefallah ◽  
R. Abu-Eittah
Keyword(s):  
Ir Spectra ◽  
Gamma Irradiation ◽  
Uv Spectra ◽  
Uv And Ir Spectra ◽  
60Co Gamma ◽  
Carbonyl Absorption

Solids of 3-iodo-, 3–5–di-iodotyrosine and 3,5-di-iodothyronine were irradiated by 60Co-gamma irradiation for a period of about twenty hours. The effects of irradiation were investigated through a study of the UV and IR spectra of irradiated samples. UV spectra showed the presence of a new band at 360 nm which was assigned to the formation of IO−. IR spectra showed a strong carbonyl absorption and the removal of the carboxylate band in the case of thyronine only. For comparison, the spectra of the studied compounds were investigated before irradiation.

ChemInform Abstract: UV and IR Spectra of the ClClO Molecule.

ChemInform ◽  
2010 ◽  
Vol 26 (31) ◽  
pp. no-no
Author(s):  
K. JOHNSSON ◽  
A. ENGDAHL ◽  
B. NELANDER
Keyword(s):  
Ir Spectra ◽  
Uv And Ir Spectra

VANILLINSÄURE ALS ENDPRODUKT DES ABBAUES VON ADRENALIN UND NORADRENALIN

1962 ◽  
Vol 39 (3) ◽  
pp. 385-394 ◽  
Author(s):  
Wilhelm Dirscherl ◽  
Helmut Thomas ◽  
Herbert Schriefers
Keyword(s):  
Melting Point ◽  
Ir Spectra ◽  
Paper Chromatography ◽  
Column Chromatography ◽  
Human Urine ◽  
Vanillic Acid ◽  
Mandelic Acid ◽  
Uv And Ir Spectra ◽  
Rat Livers

ABSTRACT In rat livers perfused with 3-methoxy-4-hydroxy-mandelic acid, formerly believed to be the endproduct of the metabolism of adrenaline and noradrenaline, three metabolites were detected by paper chromatography. After further purification by column chromatography, one of these substances was identified by melting point, shape of crystals, UV- and IR-spectra as vanillic acid. Perfusion with vanillic acid yielded only one metabolite in very small quantities. Because of its properties it is assumed to be a conjugate of vanillic acid. Hence vanillic acid, isolated in 1959 from human urine by Dirscherl & Schmidtmann, is the actual endproduct of the metabolism of adrenaline and noradrenaline.

scholarly journals Compounds of Complex Halo and Pseudohalo Acids of the Group II B Metals, Part I Etherate, Pyridine and Aniline Compounds of Zn(II)

1979 ◽  
Vol 34 (8) ◽  
pp. 1101-1106 ◽  
Author(s):  
A. G. Galinos ◽  
J. K . Kouinis ◽  
P. V. Ioannou ◽  
Th. F . Zafiropoulos ◽  
S. P. Perlepes
Keyword(s):  
Solid State ◽  
Ir Spectra ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Uv And Ir Spectra ◽  
Group Ii ◽  
Physical And Chemical ◽  
And Chemical Properties

The preparation of sixteen new etherate, pyridine and aniline compounds of complex halo and pseudohalo acids of Zn(II) is reported.The study of some physical and chemical properties as well as the UV and IR spectra of these compounds are discussed. Tetrahedral structures are proposed for all compounds in the solid state

Halogenokomplexe von Osmium(III) mit Pyridin, Pyrazin, Pyrimidin und einigen Methylhomologen.

1976 ◽  
Vol 31 (8) ◽  
pp. 1099-1105 ◽  
Author(s):  
A. Scheffler ◽  
W. Preetz
Keyword(s):  
Ir Spectra ◽  
Ligand Exchange ◽  
Mass Spectra ◽  
Exchange Reactions ◽  
Uv And Ir Spectra ◽  
Chromatographic Isolation

The preparation of mer-[OsX3B3], X = Cl, Br, I; B = pyridine, 3-resp. 4-picoline, pyrimidine, pyrazine, methylpyrazine, and the chromatographic isolation of four basemixed stereoisomers mer-[OsX3(py)n(mepyz)3-n], n= 1, 2, as solid crystalline products is described. Mass spectra and ligand exchange reactions confirm the structure of these complexes. The UV and IR spectra are discussed.

Interconversion of Nitrenes, Carbenes, and Nitrile Ylides by Ring Expansion, Ring Opening, Ring Contraction, and Ring Closure: 3-Quinolylnitrene, 2-Quinoxalylcarbene, and 3-Quinolylcarbene

2009 ◽  
Vol 62 (3) ◽  
pp. 275 ◽  
Author(s):  
David Kvaskoff ◽  
Ullrich Mitschke ◽  
Chris Addicott ◽  
Justin Finnerty ◽  
Pawel Bednarek ◽  
...  
Keyword(s):  
Ir Spectra ◽  
Ring Opening ◽  
Density Functional ◽  
Diazo Compound ◽  
Density Functional Theory Calculations ◽  
Ring Expansion ◽  
Uv Spectra ◽  
Ring Closure ◽  
High Yield ◽  
Uv And Ir Spectra

Photolysis of 3-azidoquinoline 6 in an Ar matrix generates 3-quinolylnitrene 7, which is characterized by its electron spin resonance (ESR), UV, and IR spectra in Ar matrices. Nitrene 7 undergoes ring opening to a nitrile ylide 19, also characterized by its UV and IR spectra. A subsequent 1,7-hydrogen shift in the ylide 19 affords 3-(2-isocyanophenyl)ketenimine 20. Matrix photolysis of 1,2,3-triazolo[1,5-c]quinoxaline 26 generates 4-diazomethylquinazoline 27, followed by 4-quinazolylcarbene 28, which is characterized by ESR and IR spectroscopy. Further photolysis of carbene 28 slowly generates ketenimine 20, thus suggesting that ylide 19 is formed initially. Flash vacuum thermolysis (FVT) of both 6 and 26 affords 3-cyanoindole 22 in high yield, thereby indicating that carbene 28 and nitrene 7 enter the same energy surface. Matrix photolysis of 3-quinolyldiazomethane 30 generates 3-quinolylcarbene 31, which on photolysis at >500 nm reacts with N2 to regenerate diazo compound 30. Photolysis of 30 in the presence of CO generates a ketene (34). 3-Quinolylcarbene 31 cyclizes on photolysis at >500 nm to 5-aza-2,3-benzobicyclo[4.1.0]hepta-2,4,7-triene 32. Both 31 and 32 are characterized by their IR and UV spectra. FVT of 30 yields a mixture of 2- and 3-cyanoindenes via a carbene–carbene–nitrene rearrangement 31 → 2-quinolylcarbene 39 → 1-naphthylnitrene 43. The reaction mechanisms are supported by density functional theory calculations of the energies and spectra of all relevant ground and transition state structures at the B3LYP/6–31G* level.

The state of anthraquinone in sulfuric acid (UV and IR spectra)

1967 ◽  
Vol 1 (6) ◽  
pp. 565-568
Author(s):  
V. V. Kozlov ◽  
Yu. A. Kolesnik ◽  
L. A. Kazitsyna
Keyword(s):  
Sulfuric Acid ◽  
Ir Spectra ◽  
The State ◽  
Uv And Ir Spectra
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