| 摘要 |
A novel naphthalene compound, 1,1,2,3,4,4,6-heptamethyl-1,2,3,4-tétrahydronaphthalene, is useful as an intermediary for the preparation of 5,6,7,8-tetrahydro-3,5,5,6,7,8,8-heptamethyl-2-naphthalenecarbaldehyde. It is prepared by a method which involves adding an olefin of formula (III), in which R<1> and R<2> stand for different substituants and each defines a hydrogen atom or a methyl radical, to the p-cymene. The 4,4-dimethyl-2-pentene[compound (III):R<1>=CH3; R<2>=H] is obtained by cometathesis reaction of an olefin of formula (I), where R<1> and R<2> stand for identical substituents, each being a hydrogen atom or a methyl radical, with an olefin of formula (II) in which R<3> and R<4> may be the same or different and each stands for a hydrogen atom or a methyl radical, in the presence of a suitable catalyst consisting of Re2O7 on an inert solid support, or WCl6/(C2H5)2O/Bu4Sn. |
