ChemInform Abstract: 2‐Phenylsulfinylmethyl‐1,3‐butadiene in the Thermal Diels‐Alder Reaction.

Веселовский, В. В.; Makarova, Z. G.; Lutsenko, A. I.; Shpiro, N. A.; Zhulin, V. M.; Moiseenkov, A. M.

doi:10.1002/chin.198842108

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“…Readily available racemic 2-(phenylsulfinylmethyl)buta-1,3diene ( 405) is an active diene. 363 This compound reacted with dimethylcyclopropene to give a mixture of exo-and endo-adducts 406. After reductive desulfinylation, the exo-adduct was converted into D 3 -carene (407).…”

Section: B Sulfonyl-and Sulfinyl-containing Dienesmentioning

confidence: 99%

Sulfones and sulfoxides in the total synthesis of biologically active natural compounds

Prilezhaeva¹

2000

Russ. Chem. Rev.

185

103

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A graphical treatment of the tone reproduction problem in television systems satisfactorily answered by extensive experimental work, using the techniques of subjective appraisal which have been increasingly developed in recent years. Direct comparison of a reproduction and an original, with all the parameters of the system accurately known, calls, of course, for a considerable experimental effort. Such limited observations as have been made, however, suggest that the shape of the curves at least gives a good impression of the relative effects of viewing cathode-ray tubes with different values of A, and operating under, different conditions. It is not intended to draw any conclusions or express any as to what form of reproduction characteristic is most desirable. There can, however, be little doubt that there are instances where faithful reproduction is not desirable -where, in fact, the television system can improve on the eye and convey the maximum of information or enhance the asthetic value of a scene by emphasizing certain luminosity differences at the expense of others. To a large extent the value of such distortions must be a matter of personal preference.What constitutes the most desirable form of characteristic is, again, a question which calls for large-scale experiment on a subjective basis; factors such as signal-to-noise ratio and the effect of the characteristic on apparent definition have to be taken into account.Reference may be made in passing to the results of Jones's investigation into the preferences of a large number of observers in the matter of photographic prints.Q) This investigation tends to show that preferred prints are those in which the gradient of the logL,/logL, curve is approximately unity for the medium tones, and that a greater fall in the gradient is acceptable towards black. It would be unwise to assume, however, that the results obtained are necessarily applicable to television practice, where the form of the transfer characteristics and the viewing conditions are different. One general principle which does not seem to be in dispute is that, whereas a considerable tolerance exists when the reproduction is in monochrome, colour calls for a much closer approach to fidelity in luminosity reproduction.Large-area luminance range in modern aluminized cathoderay tubes, in the absence of external light, appears to offer little scope for worth-while improvement. It is worth noting, however, that the importance of good detail luminance range in determining the subjective quality of television pictures has been stressed by Law@) and other writers.Assuming that an optimum characteristic, or range of characteristics, can be defined, practical realization of the optimum raises a number of issues, e.g. the relative contributions of the transmitting and receiving apparatus to the overall result, and whether the desired objective can best be arrived at by selection of the camera or cathode-ray tube characteristic or by suitable circuit design.It is hoped that the present communication may help...

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Section: B Sulfonyl-and Sulfinyl-containing Dienesmentioning

confidence: 99%

Sulfones and sulfoxides in the total synthesis of biologically active natural compounds

Prilezhaeva¹

2000

Russ. Chem. Rev.

185

103

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“…40 The rearrangements of the adducts of 2-phenylsulfinylbuta-1,3diene with 3,3-dimethylcyclopropene or methyl vinyl ketone afforded carenols 31 (a mixture of the a-and b-isomers in a ratio of 7.5 : 1) and a mixture of isomers of 4-acetyl-2-hydroxycyclohexanone (32), respectively. 41 The asymmetric tandem process consisting of the Diels ± Alder reaction and the sulfoxide ± sulfenate rearrangement can be performed with the use of enantiomerically pure 1-arylsulfinylbuta-1,3-dienes containing an electron-withdrawing substituent at position 4. Thus one-pot thermal reactions of such dienes with an excess of N-methylmaleimide gave rise to enantiomerically pure cyclohexene-containing compounds in high yields.…”

Section: + Brmentioning

confidence: 99%

Rearrangements of sulfoxides and sulfones in the total synthesis of natural compounds

Prilezhaeva¹

2001

Russ. Chem. Rev.

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AbsbaCL An alomcdly ordered PdCu&o.p hydride was spthesizcd at 600 K and a hydxogcn p m s m of 3 GPa Irs Netd lanice had B primitive temgonal cell fomcd from the initial K c cell of thc disordcred PdCu alloy due to ordcrbg of the Pd and Cu atoms into allemve la)cn perpendicul;lr to the tetragonal c-ais. Rietveld refinemcat of Ihe neumn diffraction pallem of P d C u b 9 m a u r e d ai 80 K showcd thc H ~o m s to occupy octahedral interstitials within thc Pd layers. The inclastic neumu scanering sNdy at 35 K revealed a broad hydrogen o p i d peak with pcculivlties at energy m s f c n of 79 and 95 meV and of I13 meV uhich wcre zcribed to the H vibrations in the P d H planes and dong thc CU-H chains perpendiculv to the planer, respectively. The paantid for hydmgen *OM in the PdCK+9 ordered phase was thus noticeably diffcrenc even in the Pd-H plane, from that in the h o u n hydrides of pdhdium and palladium alloys. The value of approximly 116 meV was predicted forthc l o d H vibntions in dilute Cu-H solid solutions. E G 1991 Physica B 174 25741 Sov. Phys.-Solid State 33 87-90 Calcu&fions: User Manual (IFF KFA, Jiilich) Jiil-Spa-366 Rev. B 36 8798-801 A I, Bashkin IO, Sinicyn V V and Ponyatovskii E G 1989 Physlca C 162-164 1369-70 Belushkin A V 1993 Phys. Solid Srate 35 99-103

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ChemInform Abstract: 2‐Phenylsulfinylmethyl‐1,3‐butadiene in the Thermal Diels‐Alder Reaction.

Abstract: The phenylsulfinylbutadiene (Ia) is coupled with the dienophiles (II), (IV), or (IX) to give the Diels‐Alder products (IIIa), (V), or (X) and (XI).

Cited by 2 publications

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Sulfones and sulfoxides in the total synthesis of biologically active natural compounds

Sulfones and sulfoxides in the total synthesis of biologically active natural compounds

Rearrangements of sulfoxides and sulfones in the total synthesis of natural compounds

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