Two groups of juvenile hormone analogs were synthesized. One lacks the alkyl substituent at C-7. The other possesses the alkyl substituents neither at C-3 nor at C-7. These analogs were almost inactive on Bombyx mori L. Some of them with the alkyl substituent at C-3, however, were active on Tenebrio molitor L. This indicates the very narrow sensitivity of Bombyx mori L. to juvenile hormone analogs.
