Abscisic aldehyde

Several natural products and pharmaceuticals have been made in which a TRAP-catalysed oxidation of a primary alcohol to aldehyde step occnrs, and these are listed in 2.1.3 abscisic acid, altohyrtin A, (+)-arisngacin A, 14-[2H]-arteether (Fig. 2.4), astrogorgin, avermectin-Bla (Fig. 2.6), (H-)-batzelladine A (Fig. 1.13), brevetoxin B, (+)-catharanthin, ( )-epibatidine, 2-epibotcinolide, (-)-7-epicylin-drospermopsin, ( )-epimaritidine, epothilone C, irisqninone (Fig. 2.3), gambieric... 

The 1,1-didesmethyl analogue (181) of abscisic acid (23) has been prepared.110 The cis-trans photoisomerization of (23) has been studied.111 A convenient procedure has been developed for the catalytic hydrogenation of p-ionone (142) to the m-5,6-dihydroionone (182).112 On treatment with Me2S+ CH, p-ionone gave the epoxide (183), which with MgBr2 afforded the aldehyde (184) without halohydrin formation.113... 

Abscisic acid (ABA) levels in rice plants, 308,31Or levels in squash hypocotyls, 315/.316 Active component of brassins identification, 9,lQf pilot plant extraction, 6,7/,8 solvent partition and column chromatography, 8 Adventitious root(s) development, 233,234r,235 formation, 247 Agriculture, application of 24-epibrassinolide, 280-290 22-Aldehydes, synthesis of brassinosteroids, 47-50f a hormone function, description for brassins, 4... 

The final fate of C-20, which is lost during the biosynthesis of the C19 gibberellin lactones, is as carbon dioxide. Gibberellin A13 aldehyde may be an intermediate in gibberellin biosynthesis prior to this step. The conversion of gibberellin A9 into gibberellin A20 in excised lettuce hypocotyls has been observed. " Gibberellins Ag, Aie, and A24 and abscisic acid have been detected by g.c.-m.s. in rye. 

Xanthoxin is an advanced biosynthetic precursor of ABA and thus its quantification in higher plants is of interest. The aldehyde group is readily coupled directly to carrier proteins via reduction of a Schiff s base formed by reaction with protein amino-groups (Fig 3). Antiserum to such a conjugate has been produced and shows specificity for compounds having the same functionality on the cyclohexane ring [73]. Phaseic acid is a metabolite of abscisic acid and specific monoclonal antibodies have been produced to the... 

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