Hyalophora cecropia, juvenile hormone

The structure of the juvenile hormone of the moth Hyalophora cecropia was confirmed by the following synthesis. (At each stage where geometric isomers were obtained, these were separated and the desired one—(Z) or ( )—was selected on the basis of its nmr spectrum.)... 

What is the structure of the juvenile hormone of Hyalophora cecropia Account for the fact that the synthesis yields a racemic modification. 

Synthesis of olefins1 (see Triethylphosphonoacetate, 1, 1217). The trimethyl ester was used in two key steps in the synthesis of the juvenile hormone of Hyalophora cecropia, methyl trans,trans,cj j-10,1 l-epoxy-7-ethyl-3,ll-dimethyl-2,6-tridecadieno-ate (formula I) the reagent was used in the preparation of ds-II and of trans,cis-Vll. 

Another example of a sesquiterpene-derived insect juvenile hormone is that of the giant silkworm moth, Hyalophora cecropia (Fig. 21.18). Several juvenile hormone mimics have been found in plants (Bowers, 1985,1991,1992 Fraga, 1991 Menn and Beroza, 1972). 

Juvenile hormone, larval hormone, stalus-quo hormone insect hormone responsible for the control of molting. The first J.h. to be isolated and structurally elucidated was obtained from the abdomens of the male silk worm moth (Hyalophora cecropia) in 200 ig quantities. Homologs of this compound were discovered later, and other J.h. were postulated. Juva-bione (see) and famesol derivatives are among the... 

In many insects, for example in the large silk moth Hyalophora cecropia, a large amount of the juvenile hormone is stored. In most species it is inactive, or is so bound that it is no longer extractable. In Tenebrio, excretion in the faeces heis been observed" , the substance being identified as famesol. 

Juvenile hormone (JH) is a substance that controls metamorphosis in insects. It is produced by the male wild silk moth, Hyalophora cecropia L., and its presence delays the maturation of insect larvae until the appropriate... 

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