Thio derivatives of β-diketones and their metal chelates. VII. The visible-ultraviolet spectra of some monothio-b-diketones and their metal chelates

1967 ◽  
Vol 20 (6) ◽  
pp. 1079 ◽  
Author(s):  
SHH Chaston ◽  
SE Livingstone
Keyword(s):  
Oxygen Atom ◽  
Electronic Spectra ◽  
Metal Chelates ◽  
Sulphur Atom ◽  
Cadmium Complexes ◽  
Ultraviolet Spectra ◽  
Mercury Complex ◽  
Methyl Derivatives ◽  
Derivatives Of

The electronic spectra of 3-mercapto-1,3-diphenylprop-2-en-1-one, PhC(SH)=CHCOPh, and its zinc(II), silver(I), cadmium(II), mercury(II), and S-methyl derivatives are given and some provisional assignments of the bands are made. The spectra indicate that the oxygen atom of the ligand is weakly coordinated in the silver and cadmium complexes and that in the mercury complex the ligand is coordinated through the sulphur atom only. The spectra of two other monothio-β-diketones, R1C(SH)=CHCOR2 (R1 = R2 = Me, But), are also given. The spectra of the nickel(II) chelates of seven monothio-β- diketones are discussed and the bands are assigned as metal d-d, metal- to-ligand, ligand-to-metal, and ligand-to-ligand transitions.

Thio derivatives of β-diketones and their metal chelates. IX. Nickel and copper complexes of some new fluorinated monothio-β-diketones

1968 ◽  
Vol 21 (7) ◽  
pp. 1781 ◽  
Author(s):  
RKY Ho ◽  
SE Livingstone
Keyword(s):  
General Formula ◽  
High Spin ◽  
Copper Complexes ◽  
Nickel Complexes ◽  
Metal Chelates ◽  
Sulphur Atom ◽  
Derivatives Of ◽  
Infrared Data

Four new fluorinated monothio-β-diketones of general formula RC(SH)=CH- COCF3 have been prepared; they are: l,l,l-trifluoro-4-mercapto-4-(4-methylphenyl)but-3-en-2-one (R = p-methylphenyl), 1,1,1-trifluoro-4-mercapto-4- (4-methoxyphenyl)but-3-en-2-one (R = p-methoxyphenyl), 4-(4-bromophenyl)-l,l,l- trifluoro-4-mercaptobut-3-en-2-one (R = p-bromophenyl), and l,l,l-trifluoro-4- (2-furyl)-4-mercaptobut-3-en-2-one (R = 2-furyl). Their nickel complexes, which are brown and diamagnetic, yield stable high-spin bis-pyridine adducts. When R = p-MeC6H4, p-MeOC6H4, or p-BrC6H4 the ligand yields both copper(1) and copper(11) complexes but when R = 2-furyl only a copper(11) complex is obtained. Infrared data indicate that in the copper(1) complexes the ligand is coordinated through the sulphur atom only.

Pyrimidine reactions. XVI. Thermal rearrangement of substituted 2- and 4-alkoxypyrimidines

1968 ◽  
Vol 21 (1) ◽  
pp. 243 ◽  
Author(s):  
DJ Brown ◽  
T Lee
Keyword(s):  
Electronic Effect ◽  
Thermal Rearrangement ◽  
Ultraviolet Spectra ◽  
Pka Value ◽  
Nitro Derivatives ◽  
Methyl Derivatives ◽  
Spectral Comparison ◽  
Derivatives Of ◽  
Methyl Bromo

Thermal rearrangement of methyl, bromo, and nitro derivatives of 2- and 4-alkoxy-pyrimidines produced their N-alkyl isomers. These were identified by p.m.r. spectral comparison with synthetic specimens of unambiguous or proven structure. The rates for such isomerizations were measured conveniently by changes in ultraviolet spectra. The C-methyl derivatives rearranged more slowly than the parent alkoxypyrimidines, but the bromo, and especially the nitro, derivatives did so much more quickly. Among the derivatives of each methoxy-pyrimidine, the rate of rearrangement increased as the basic pKa value fell and as the methoxyl protons moved downfield, thus affording a qualitative correlation with properties reflecting the electronic effect of each substituent.

Physical Properties of TCNQ Salts with N-Methyl Derivatives of Pyridine

1982 ◽  
Vol 85 (1) ◽  
pp. 257-263 ◽  
Author(s):  
A. Graja ◽  
M. Przybylski ◽  
B. Butka ◽  
R. Swietlik
Keyword(s):  
Physical Properties ◽  
Methyl Derivatives ◽  
Derivatives Of

Methyl derivatives of furan

1974 ◽  
Vol 39 (11) ◽  
pp. 3109-3116 ◽  
Author(s):  
J. Šrogl ◽  
M. Janda ◽  
I. Stibor ◽  
V. Skála ◽  
P. Trška ◽  
...  
Keyword(s):  
Methyl Derivatives ◽  
Derivatives Of

O'-Methyl derivatives of arabinosylcytosine

1972 ◽  
Vol 46 (4) ◽  
pp. 1734-1741 ◽  
Author(s):  
E. Darżynkiewicz ◽  
J.T. Kuśmierek ◽  
D. Shugar
Keyword(s):  
Methyl Derivatives ◽  
Derivatives Of
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