Chemistry of hydrocarbon compounds – Compound or reaction product mixture – Aromatic
Patent
1994-08-05
1995-12-19
Achutamurthy, P.
Chemistry of hydrocarbon compounds
Compound or reaction product mixture
Aromatic
585 24, 585 25, 585411, 585459, C07C 1348, C07C 266
Patent
active
054769779
ABSTRACT:
1,1,2,3,4,4,6-Heptamethyl-1,2,3,4-tetrahydronaphthalene, a novel naphthalenic compound, is useful as an intermediate for the preparation of 5,6,7,8-tetrahydro-3,5,5,6,7,8,8-heptamethyl-2-naphthalenecarbaldehyde. It is prepared by a process consisting of the addition of an olefin of formula ##STR1## wherein R.sup.1 and R.sup.2 represent different substituents and each defines a hydrogen atom or a methyl radical, with p-cymene. 4,4-Dimethyl-2-pentene [compound (III): R.sup.1 =CH.sub.3 ; R.sup.2 =H] is obtained by the co-metathesis reaction of an olefin of formula ##STR2## wherein R.sup.1 and R.sup.2 represent identical substituents designating each a hydrogen atom or a methyl radical, with an olefin of formula ##STR3## wherein R.sup.3 and R.sup.4 identical or different, designate each a hydrogen atom or a methyl radical in the presence of an appropriate catalyst consisting of Re.sub.2 O.sub.7 on an inert solid carrier, or of WCl.sub.6 /(C.sub.2 H.sub.5))/Bu.sub.4 Sn.
REFERENCES:
patent: 4284818 (1981-08-01), Sato et al.
patent: 4551573 (1985-11-01), Cobb
patent: 4877916 (1989-10-01), Frank
Chemical Abstracts: 104704t, vol. 99, 1983.
Leresche Jean-Paul
Mentha Yves
Achutamurthy P.
Firmenich SA
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