Peculiarities of the manifestation of the K absorption bands in the UV absorption spectra of azomethine bases

The structure of the UV spectra of azomethine bases of the thiophene and dithienyl series was examined on the basis of the concept of the nonplanar structure of azomethine bases. A peculiarity of the manifestation of the K absorption bands associated with stabilization of the wavelengths of the K bands, which is determined by an increase in the angle of acoplanarity of the azomethine system above 30°, was revealed.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1043–1046, August, 1977.     

Glueballs versus quarkonium-flavor symmetry signatures

Flavor symmetry selection rules provide unambiguous signatures for glueball decays at masses above 1500 MeV where many channels are open. For example, a 2⁺⁺ glueball should decay into ππ, K$\text{K}$, ηη, η'η', ωω, ?? and ψψ, but not into K¹$\text{K}$ nor ηη'. A quarkonium or a four-quark state cannot go into all channels allowed for a glueball; at least one is OZI-forbidden for any choice of flavors. But any quarkonium state that goes to K$\text{K}$ should also go to K¹$\text{K}$ and ηη'. These selection rules are shown to be stable against SU(3) symmetry breaking.     

Bromination of 4-(2-thienyl)thiazoles and 2-(2-thienyl)quinoline

Depending on the substituent, the bromination of 4-(2-thienyl)thiazoles and 2-(2-thienyl)quinoline takes place in the 5 position of the thiophene or thiazole ring. When an amino group is present in the 2 position of the thiazole ring, bromination takes place in the 5 position of the thiazole ring. When excess brominating agent is present, a second bromine atom enters the 5 position of the free ring.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 35–38, January, 1982.     

Researches on condensation products of some 2, 2′-dithieniyl compounds. I

Crotonaldehyde-type condensation of 5-acetyl-2, 2-dithienyl with some aromatic and heterotyclic aldehydes and nitroaldehydes in the presence of alkali is used to synthesize a number of hitherto undescribed unsaturated 2, 2-dithienyl ketones. The visible and UV absorption spectra of these compounds of the ketones synthesized are measured in ethanol and 96% sulfuric acid solutions. In sulfuric acid all the compounds investigated form intensely colored halochromic solutions. Comparison of the spectral characteristics of the compounds prepared shows that replacement of the benzene ring by furan and thiophene rings gives rise to a bathochromic effect which is significantly greater in acid solution than in neutral solution. For the neutral solution, introduction of a single nitro group into the benzene or thiophene ring gives rise to a K-band bathchromic shift, while in acid solution there is a hypsochromic effect.     

Does the Pomeron have two components?

Experimental total and differential elastic cross sections are in remarkable agreement with the ansatz that the Pomeron contribution satisfies the relation $\text{P(π}\text{p}\text{) = (}\text{1}\text{2}\text{)P(}\text{Kp}\text{) + (}\text{1}\text{3}\text{)P(}\text{pp}\text{)}$ weaker than the quark model relation $\text{P(π}\text{p}\text{) = P(}\text{KP}\text{) = (}\text{2}\text{3}\text{)P(}\text{pp}\text{)}$ and following from the assumption that the Pomeron has a second component satisfying the relation $\text{P(π}\text{p}\text{) = 2P(}\text{KP}\text{) = (}\text{4}\text{9}\text{)P(}\text{pp}\text{)}$. Sum rules obtained from this ansatz are satisfied to an accuracy of 1% by total cross section data from 6 to 200 GeV/c where the quark model relation has a consistent discrepancy of 15%. They are satisfied to better than 20% for differential cross section data at 3, 3.6, 5, 6 and 42 GeV/c over a range of t where cross sections change by several orders of magnitude and the ratio of Kp and pp amplitudes varies from $\text{2}\text{5}$ to 5 and violates the simple quark model prediction of $\text{2}\text{3}$ by large factors in both directions.     

Agropine,a new amino acid derivative from crown gall tumours

Agropine, an unusual compound produced in plant tumours was shown by mass spectrometry and proton and carbon-13 nmr spectroscopy to be a bicyclic derivative of glutamic acid and a hexitol sugar.     

Investigation of some nitrogen compounds of 2,2′-dithienyl

The acetylation and formylation of the methyl ester of the dithienyl analog of cinchophen gave 5-acetyl- and 5-formyl-5-(4-methoxycarbonyl-2-quinolyl)-2,2-dithienyls.See [1] for communication IV.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 773–774, June, 1972.     

Synthesis of carbonyl derivatives of 3-phenylthiophene

3-Phenyl-2-acetylthiophene was synthesized by the acetylation of 3-phenylthiophene with acetic anhydride in the presence of 56% perchloric acid. Previously undescribed , -unsaturated ketones were synthesized by the crotonic condensation of 3-phenyl-2-acetylthiophene with several aromatic and heterocyclic aldehydes.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1365–1367, October, 1971.