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Photochemical reactions part 26 molecular and crystalline structure of a cyclo butane cyclized gibberellin derivative

, : Photochemical reactions part 26 molecular and crystalline structure of a cyclo butane cyclized gibberellin derivative. Tetrahedron 32(16): 2021-2026

By X-ray analysis the structure and molecular packing of the cyclobutane annelated pseudogibberellin A1 derivative, prepared by a trifluoroacetic acid catalyzed Wagner-Meerwein rearrangement was established. The 1,2-cyclobutane ring fusion as well as the configuration of the 3-hydroxy group was determined and confirmed earlier suggestions. The final discrepancy R was 0.079.

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Voigt, B.; Adam, G., 1976: Photochemical reactions part 25 photochemical synthesis of gibberellins of the gibberellin a 1 series cyclized in ring a. The photochemical [2 + 2]-cycloaddition of ethylene and tetramethylethylene to 3-dehydro gibberellin A3 under n .fwdarw. .pi.*-excitation conditions was investigated. The reaction leads to a 3:1 ratio of the cis-fused .alpha.- and .beta.-cyclobuta...

Kutschabsky, L.; Reck, G.; Hoehne, E.; Voigt, B.; Adam, G., 1980: Photochemical reactions 35. topochemical and nontopochemical control in the crystalline state photo dimerization of a gibberellin enone crystal and molecular structure of 3 dehydro gibberellin a 3 methyl ester. The crystal and molecular structure of 3-dehydro gibberellin A3 methylester was determined by X-ray analysis.

Kutschabsky,, G.V.igt,, G., 1976: Photochemical reactions. XXVI. Molecular and crystal structure of a cyclobutane annelated gibberellin derivative. Tetrahedron 2 (16) 2021-2025

Kutschabsky, L.; Reck, G.; Adam, G., 1975: Photochemical reactions part 23 molecular and crystal structure of 3 dehydro gibberellin a 3. In connection with topophotochemical studies, the structure of 3-dehydro gibberellin A3 was established by X-ray analysis, and the molecular packing determined. The final discrepancy factor R was 0.078.

Escale, R.; Girard, J.P.; Vergnon, P.; Grassy, G.; Chapat, J.P.; Granger, R., 1977: Research on cyclo butane compounds of biological interest part 3 syntheses and structure activities anti inflammatory and analgesic relationships of 3 substituted cyclo butane carboxylic acids. Anti-inflammatory and analgesic activities of 3 substituted cyclobutanecarboxylic acids were noted and their structure-activity relationship was examined according to the Hansch method. This analysis shows the influence of the steric and lipophili...

Takeda, M.; Inoue, H.; Noguchi, K.; Honma, Y.; Kawamori, M.; Tsukamoto, G.; Yamawaki, Y.; Saito, S.; Aoe, K.; Et-Al, 1977: Aza bi cyclo alkanes as analgetics part 3 structure activity relationships of 1 phenyl 6 aza bi cyclo 3 2 1 octanes and absolute stereochemistry of dextro 1 3 hydroxyphenyl 6 methyl 6 aza bi cyclo 3 2 1 octane and its 7 endo methyl derivative. A series of 53 1-phenyl-6-azabicyclo[3.2.1]octanes (I) was tested for their analgetic and narcotic antagonist activities. Structure-activity relationships were investigated by varying the structural parameters. The most interesting compound in thi...

Hamon, D.P.G.; Trenerry, V.C., 1980: Cyclo propylidene insertion reactions 2 methoxy 1 2 dimethyl bi cyclo 1.1.0 butane. Syntheses of 1,1-dibromo-2-isopropyl-2-methoxy-3,3-dimethylcyclopropane (12), 1,1-dibromo-2-methoxy-2,3,3-trimethylcyclopropane (11), 1,1-dibromo-2-isopropyl-2-methoxycyclopropane (21), 1,1-dibromo-2-methoxy-3,3-dimethylcyclopropane (29) and 1,1-d...

Adam G.; Sung T.V., 1979: Photochemical reactions part 32 photochemistry of gibberellin c means for functionalizing gibbanes in positions 8 and 11. The n .fwdarw. .pi.* photochemistry of saturated diterpenoid ketones of the gibberellin C type 1 was investigated. A Norrish Type 1 cleavage leading to .DELTA.7(11) unsaturated 7,8-seco-8-aldehydes is the main process. These secoaldehydes upon pro...

Crimmins M.T.; Delaoch J.A., 1984: Intra molecular photo cyclo addition cyclo butane fragmentation a highly stereoselective total synthesis of racemic pentalenic acid. Journal of Organic Chemistry 49(11): 2076-2077

Hohne, E.S.idel,,, P., 1975: Molecular and crystalline structure of a 1-hydroxylated 3-oxo-gibberellin derivatives. Tetrahedron 31 (1) 81-83