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2/7-Thiin

Dihydropyridines are isomerized photochemically to 2-azabicyclohexenes (520). 2/7-Thiins behave as dienes in Diels-Alder reactions (Scheme 59). [Pg.245]

Pyran 200 (R1 = R2 = H) exists only as its acyclic valence tautomer but 5-acetyl-2,2,6-trimethylpyran 200 (R Me, R2 = Ac) is in equilibrium with only -35% of the valence tautomer 201 (R =Me, R2 = Ac) at 30 °C. The equilibrium of the bicyclic derivatives 202 with the ketone isomers 203 is influenced by solvent and temperature. In tetrachloroethene only 9% of the open-chain form is present at 30 °C but this rises to 40% at 113 °C <1981T1571>. Valence tautomerism of 2/7-pyran derivatives is the basis of some commercial photochromic materials. Similar properties are shown by 2/7-thiin derivatives such as the photochromic compound 204, which forms the thione 205 upon irradiation. [Pg.83]

AG7AG+, 7, 707 (76JCS(P1)913) Dibenzo[6,e]thiin, 3-dimethylamino-7-dimethyliminio-visible, 1, 346 (B-76MI11201)... [Pg.16]

H-Dibenzo[b,e]thiin, 9,9-dialkyl-pharmacology, 3, 942 10H-Dibenzo[b,e]thiin, 9-diazo-reactivity, 3, 921... [Pg.602]

H-Dibenzo[b,e]thiin-9-carboxylic acids as fungicides, 3, 941 10H-Dibenzo[b,e]thiinium salts reactions... [Pg.602]

UV spectra, 3, 955 X-ray crystallography, 3, 948 Thianthrenium salts, 5-phenyl-chloroplatinate salts, 3, 967 Thianylium salts chlorination, 3, 901 1,2A -Thiaphosphiranes synthesis, 7, 196 Thiapyrans — see Thiins l,3A -Thiarsoles nomenclature, 1, 32 Thiaselenafulvenes synthesis, 6, 965 Thiaselenins synthesis, 3, 914... [Pg.867]

H-Thiin-2-carboxylic acid, 3-oxo-3,4,5,6-tetrahydro-ethyl ester synthesis, 3, 927... [Pg.884]

Thiopurinols applications, 5, 343 synthesis, 5, 319 tautomerism, 5, 308 Thiopyrans — see Thiins... [Pg.895]

Jork, H., Ganz, J. GDCh-Thiining course No. 301 Dunnschicht-Chromatographie fUr Fortgeschrittene", Universitat des Saarlandes, Saarbriicken, 1991. [Pg.20]

The synthesis and Diels-Alder reactions of enantiopure (-)-tra s-benzo[d]thiin-S,S -dioxide 7 were described. Whereas with cyclopentadiene and 1,3-cyclohexadiene a high endolexo ratio (> 99/1) was obtained, with fiiran these values are lower depending on the reaction conditions... [Pg.119]

Raman experiments are confirmed by XPS and secondary ion mass spectrometry (SIMS) measurements performed by Thiine et al. [38] on a surface... [Pg.9]

See other pages where 2/7-Thiin is mentioned: [Pg.884]    [Pg.70]    [Pg.70]    [Pg.70]    [Pg.70]    [Pg.70]    [Pg.70]    [Pg.70]    [Pg.70]    [Pg.70]    [Pg.70]    [Pg.70]    [Pg.70]    [Pg.70]    [Pg.602]    [Pg.602]    [Pg.602]    [Pg.621]    [Pg.858]    [Pg.884]    [Pg.884]    [Pg.884]    [Pg.884]    [Pg.884]    [Pg.884]    [Pg.884]    [Pg.884]    [Pg.884]    [Pg.884]    [Pg.884]    [Pg.885]    [Pg.885]    [Pg.885]    [Pg.885]    [Pg.885]    [Pg.885]    [Pg.885]    [Pg.885]    [Pg.885]    [Pg.146]    [Pg.171]    [Pg.248]    [Pg.181]    [Pg.277]    [Pg.1209]    [Pg.375]    [Pg.376]   


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1,2-thiins

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