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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






Tetrahedron 36(23): 3421-3426

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.


Accession: 006110163



Related references

Adam G., 1973: Photochemical reactions part 20 solid state photochemistry of 3 dehydro gibberellin a 3 methyl ester light catalyzed topo dimerization and subsequent aromatization. Tetrahedron 29(20): 3177-3183

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.

Kutschabsky, L.; Reck, G.; Voigt, B.; Adam, G., 1976: Photochemical reactions part 26 molecular and crystalline structure of a cyclo butane cyclized gibberellin derivative. 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...

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

Kutschabsky L.; Adam G.; Voigt B., 1987: Molecular and crystal structure of isogibberellin a 3 methyl ester comparative molecular energy calculations of gibberellin a 3 and isogibberellin a 3. Zeitschrift fuer Chemie 27(2): 73-74

Ellames G.; Hanson J.R.; Hitchcock P.B.; Thomas S.A., 1979: The molecular and crystal structures of gibberellin a 4 and gibberellin a 13 methyl esters. The X-ray structures of gibberellin A4 methyl ester and gibberellin A13 trimethyl ester [plant hormones] were determined. Ring A is flattened and the crowding of C(7) by C(18) and C(15) is greater in gibberellin A13 trimethyl ester than gibberelli...

A.E.abi H.K.; Derwish G.A.W.; Adam G.; Schreiber K., 1981: Photo dimerization of di methyl 3 dehydro gibberellinate and subsequent photo epimerization and cleavage reactions. Irradiation (.lambda. > 300 nm) of dimethyl 3-dehydrogibberellinate 1, as a heteroannular dienone, in t-BuOH (10-2 M) for 2 h led to cyclobutane-type photodimer A in 85% yield. Irradiation of 1 under the same conditions but for 3 h gave not onl...

A.E.abi H.K.; Derwish G.A.W.; Adam G.; Schreiber K., 1981: Competition between singlet state photo reduction and triplet state photo dimerization of di methyl 3 dehydro gibberellinate. Photolysis of dilute solutions (10-4 M) of dimethyl-3-dehydrogibberellenate, in methyl, ethyl, isopropyl and tert-butyl alcohol, and 2, 2, 2-trifluoroethanol, showed that while the last 2 solutions underwent photodimerization reactions only; the o...

Narula P.; Patel H.C.; Singh T.P.; Chauhan V.S.; Sharma A.K., 1988: Crystal structure and molecular conformation of n boc l pro dehydro leu methyl ester. The peptide N-Boc-L-Pro-dehydro-Leu-OCH3 was synthesized by coupling dehydroleucine methyl ester with Boc-Pro-OH. It was crystallized from its solution in a methanol-water mixture at 4.degree. C and the crystals belong to the orthorhombic space gr...

Bearder J.R.; Kirkwood P.S.; Macmillan J., 1981: Allylic chlorination of gibberellin a 3 and gibberellin a 7 methyl esters and of gibberellin a 3 preparation of gibberellin a 5. A high-yield conversion of GA3 to GA5 isolated from Gibberella sp. is described. With thionyl chloride, GA3 methyl ester gives mainly 1.beta.-chlorogibberellin A5 methyl ester; the isomeric 3.alpha.-chloro-1-ene was the main product from the react...