4a-hydroxy-1β,7-dimethyl-8-oxo-4aα,7α-gibb-2-ene-1α,10β-dicarboxylic acid-1-lactone-10-methyl ester;4a-Hydroxy-1β,7-dimethyl-8-oxo-4aα,7α-gibb-2-en-1α,10β-dicarbonsaeure-1-lacton-10-methylester;1->4a-Lacton des 1α-Carboxy-10β-methoxycarbonyl-4aα-hydroxy-8-oxo-1β,7β-dimethyl-gibben-(2);Anhydro-gibberellin-C-methylester
在某些ent- gibberellaellane衍生物中尝试对2,3-和16,17-双键进行光氧合是成功的,但别的是用脲基酸(VIII;9α-H,R = H)及其甲基酯(VIII) ;9α-H,R = Me),其在16,17-双键处反应分别得到预期的15-en-17-ols(IX; R = H)和(IX; R = Me)。后者的酸催化重排(IX; R = Me)得到了赤霉素甲酯的羟甲基衍生物(X; R = Me),与从赤霉素A 3 16,17-环氧化物获得的重排产物的甲酯相同(XI; R = H)。来自脲醛酸甲酯的光氧合产物的重排的主要产物是15-羟基阿糖酸的7→15-内酯(XIII)。
The isolation of the growth-promoting acids, gibberellin A1 and gibberellin A5, from immature seed of Phaseolusmultiflorus is described. The structure of gibberellin A5 is established as V by degradation and by its preparation from gibberellin A1.