Zobrazeno 1 - 10
of 198
pro vyhledávání: '"R.C. Cookson"'
Publikováno v:
Tetrahedron. 25:4681-4709
Further values of geminal coupling constants ( J ) in CH 2 groups α to heteroatoms confirm established trends in the variation of J with molecular environment; in addition, J is quoted for new systems not described in Part I, and the exceptions to t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::867ea07287da321bec43d85f463e22e2
https://doi.org/10.1016/s0040-4020(01)83012-x
https://doi.org/10.1016/s0040-4020(01)83012-x
Autor:
P. Brown, R.C. Cookson
Publikováno v:
Tetrahedron. 24:2551-2566
With the single exception of anthracene, which yields the unsymmetrical adduct (VA), olefins, polyenes and aromatic compounds react with tetracyanoethylene oxide to give symmetrical 2,2,5,5-tetracyanotetrahydrofurans. With the more nucleophilic olefi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3963e1994f62168d6755d56e6a9ef392
https://doi.org/10.1016/s0040-4020(01)82528-x
https://doi.org/10.1016/s0040-4020(01)82528-x
Publikováno v:
Tetrahedron. 24:1989-1995
The values of geminal coupling constants in methylene groups linked to sulphur atom are reviewed. Eclipsing of the lone pairs on a sulphur atom with the C-H bonds of an adjacent methylene group (as in a ring of 5 atoms) makes the constant 2 or 3 c/s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c21cf0fcd4254306a0b21b0acdc331a6
https://doi.org/10.1016/s0040-4020(01)82504-7
https://doi.org/10.1016/s0040-4020(01)82504-7
Publikováno v:
Tetrahedron. 18:547-558
Saturation of the double bond in shellolic acid by hydrogenation, hydroxylation or bromination results in the formation of δ- and γ-lactones, the further reactions of which are discussed in the light of the structure for the acid recently establish
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::be06729559075370f24f0c3e0740b252
https://doi.org/10.1016/s0040-4020(01)92705-x
https://doi.org/10.1016/s0040-4020(01)92705-x
Publikováno v:
Tetrahedron. 22:355-390
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::22832d44e435de6381d3ac13ce68432d
https://doi.org/10.1016/s0040-4020(01)99123-9
https://doi.org/10.1016/s0040-4020(01)99123-9
Publikováno v:
Tetrahedron. 24:4625-4630
The conformations assigned to 5-nitro-5-methyl-tetrahydro-1,3-oxazines on the basis of dipole moment data are consistent with the geminal coupling constants. The NMR spectra of 6-mono, and 6,6-disubstituted tetrahydro-1,3-oxazines is discussed in rel
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e2767b13b98a4ac5b60b64d4f14aa715
https://doi.org/10.1016/s0040-4020(01)96300-8
https://doi.org/10.1016/s0040-4020(01)96300-8
Autor:
P. Brown, R.C. Cookson
Publikováno v:
Tetrahedron. 21:1977-1991
The enthalpy of activation for Diels-Alder addition of tetracyanoethylene to anthracene ranges from only 4·2(5) Kcal mole − in chloroform to 12·3 Kcal mole −1 in o -xylene. In the aromatic solvents ΔH ‡ for addition to bicycloheptadiene is c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::233e17a8b51fc07a27645758b92e3c5f
https://doi.org/10.1016/s0040-4020(01)98337-1
https://doi.org/10.1016/s0040-4020(01)98337-1
Autor:
R.C. Cookson, T.A. Crabb
Publikováno v:
Tetrahedron. 24:2385-2397
The variation of the geminal coupling constant between protons in CH2 groups with the nature and orientation of adjacent heteroatoms in a series of 5- and 6-membered ring heterocyclic compounds is described.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e2fd0f720687eb80f2015171539f5593
https://doi.org/10.1016/0040-4020(68)88140-2
https://doi.org/10.1016/0040-4020(68)88140-2
Publikováno v:
Tetrahedron. 24:3955-3964
UV irradiation of trans-2-(3′-deuterioallyl)cyclohexylidenemalononitrile (XIa) induces rearrangement to allyl-1-cyclohexenylmalononitrile, in which the deuterium is still entirely at the 3-position of the allyl group but has lost its geometrical co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::439c081a4d6c37f7193982e4374ae64d
https://doi.org/10.1016/s0040-4020(01)92603-1
https://doi.org/10.1016/s0040-4020(01)92603-1
Publikováno v:
Tetrahedron. 24:4559-4564
The NMR Spectra of 1,3-dioxans substituted at C5 with an asymmetric group provide clear evidence of coupling, extending over four bonds, between the C4 and C6 equatorial protons.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::93d20f41b1517d5beadf2f0b4b32858a
https://doi.org/10.1016/s0040-4020(01)96293-3
https://doi.org/10.1016/s0040-4020(01)96293-3