Tetraene 1-carboxylic acid

A pseudo-C(2) symmetric trans-diphenyl oxazoline group has been reported to act as a chiral auxiliary in the 8k, 6k tandem electrocyclization of a substituted tetraene 1-carboxylic acid in a process where both s-cis and s-trans conformations favour the transition states with the same helical twist (Scheme 29) ... [Pg.480]

Thiacyclotrideca-2,4,10,12-tetraene-6,8-diyne 1 -oxide, 5,10-dimethyl- HNMR, 7, 717 (75JA640) 4-Thia-2,6-diazabicyclo[3.2.0]heptane-2-carboxylic acid, 7-OXO-, t-butyl ester X-ray, 7, 349 (B-72M151201) 5H-2aA -Thia-2,3-diazacyclopent[cd]indene, 2,3-dimethyl-6,7-dihydro-X-ray, 6, 1054 (72ACS343)... [Pg.61]

R c-3-methoxy-l 8-methyl-17a-ethynylestra-l,3,5(10)-trien-17 -ol, 73 3-Methoxy-D-norestra-l,3,5( 10) -trien-16/3-carboxylic acid, 442 3-Methoxy-m-19-norpregna-l,3,5 (10), 17(20)-tetraene, 132 3-Methoxy-19-nor-17a-pregna-l, 3,5 (10), 15-tetraen-20-yn-17/3-01, 139... [Pg.461]

Fe complex of 2,2 -bipyridine-3,5 -dicarboxylic acid but the pyridine-4-carboxylic acid was observed not to be photosensitive in the presence of Fe ions. The photochemistry of low-spin Fe complexes with macrocyclic ligands continues to be a field that attracts interest. Irradiation of the charge-transfer bands of [Fe(TIM)(OMe)(MeOH)] + (TIM = 2,3,9,10-tetramethyl-l,4,8,ll-tetraazacyclotetradeca-l,3,8,10-tetraene) and of [Fe(DMG)2(OMe)(MeOH)] (DMG = dimethylglyoxime), was found to lead to oxidation of the co-ordinated MeOH and reduction of the metal centre. These photoreactions have been attributed to the population of methoxy-to-Fe CT states. [Pg.178]

Dihydroxy-6-methoxy-3-methyl-4-isochromanone, in T-30193 Ethyl haematommate, in F-10015 Plumbagic acid, P-20122 2,5,10-Trihydroxy-/7-mentha-l,3,5,8-tetraen-9-carboxylic acid, T-30190... [Pg.525]

Trihydroxy-/ -mentha-1,3,5,8-tetraen-9-carboxylic acid 2-Ac, Me ester, in T-30190 Zhepiresinol, Z-30003... [Pg.532]

C28H16N2, (3-Pyrida-3-(2,6))(6-benza-6-(1,4 2,5))(9-pyrida-9-(2,6))-spiro[5.5]undecaphane-l,4,7,l0-tetraene, 43B, 384 C24H21N3O3, 3aa,40,8/3-3a,4-Dihydro-3-oxo-2,3a-diphenyl-4,8-etheno-3H-pyrazolo[1,5-c](1,3)diazepine-7(8H)-carboxylic acid ethyl ester, 46B, 300... [Pg.156]

Ethyl 2ff-pyran-2-carboxylate (32) 6-Ethoxy-2tf-pyran-2-carboxaldehyde (33) (Z -6-Oxo-2,4-hexadienoic acid (Sda) ( ,Z)-6-Oxo-2,4-hexadienoic acid (34b) (Z, )-6-Oxo-2,4-bexadienoic acid (34c) ( JS)-6-Oxo-2,4-hexadienoic acid (34d) 4-Caifaoxyinethylbut-2-eii-l,4-olide (muconolactone) (37) Bicyclo[S.1.0]octa-2,4-diene (41) (Z Octa-l,3.5,7-tetraene (42) ... [Pg.328]

A soln. of 17) -acetoxyandrosta-l,4,6-trien-3-one and phenyltridiloromethylmercury in benzene refluxed 26 hrs., the crude reaction mixture dissolved in ethyl acetate, diromatographed on silica gel, and the product eluted with ethyl acetate containing acetic acid 17 -acetoxy-l-methylestra-l,3,5(10),6-tetraene-3-carboxylic... [Pg.204]

BFg-etherate added to a soln. of 1.50 g. l,2,3,9a-tetrahydro-2,8-dimethyl-9) -methoxycarbonyl-3-oxofluoren-9aa-ylacetic acid in acetic acid-acetic anhydride, and allowed to stand overnight at room temp. 1.20 g. methyl ( )-l,7-dimethyl-6,8-dioxogibba-A,4b-tetraene-10j -carboxylate. H. J. E. Loewenthal and S. K. Malhotra, Soc. 1965, 990. [Pg.227]

The base-catalyzed condensation reaction of the C15 aldehyde (4) with methyl P-methylglutaconate (536) gave the retinoic acid derivative (537), which is substituted in the tetraene side chain by an additional carboxyl group. [Pg.103]

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