3- Methyl-2-cyclo-hexen

Obtained by aromatization of 4-acetyl-5-[4-(dimethyl-amino)phenyl]-3-methyl-2-cyclo-hexen-l-one (m.p. 162°) with bromine in... 

Analog erhalt man aus 1-Phenyl-propen J-Phenyl-propan6 bzw. aus 4-Methyl-cyclo-hexen 4-Methyl-cyclohexan6. 

Methyl- 7-octyl- 2- [5-hydroxy- 2-methyl-cyclo-hexen-(1)-yl]-athinyl[ 78... 

These researches on the synthesis of the terpenes were commenced in 1900, and has been carried on with considerable success and conspicuous ability ever since. It was considered necessary to synthesise terpineol, and BO establish the formula which analytic reactions supported. The first necessary step was to synthetically prepare the l-methyl-A -cyclo-hexene-4-earboxylic acid, of the formula—... 

Ethyl-5-phenyl-2,4,6(l//,3//,5//)-pyrimidinetrione synonym 5-ethyl-5-phenylbarbituric acid. 5-Ethyl-1-methyl-5-phenylbarbituric acid. 5-Ethyl-5-phenyldihydro-2-thioxo-4,6(lEf,5H)-pyrimidine-dione synonym 5-ethyl-5-phenyl-2-thiobarbituric acid. 5-Ethyl-5-hexyl-2-thiobarbituric acid. 5-Ethyl-5-isopentylbarbituric acid. 5-Ethyl-5-(l-methylbutyl)-2-thiobarbituric acid. 5-(l-Cyclo-hexen-l-yl)-l,5-dimethylbarbituric acid. 5-Ethyl-5-(l-methylbutyl)barbituric acid. 5-(l-Cyclohexen-l-yl)-5-ethylbarbituric acid. 

Fig. 3.1. (cont.) (S)(+)-isopiperitenone (3-methyl-6-(5 )-isopropenyl-2-cyclo-hexen-l-one) 17, isopiperitenol (3-methyl-6-isopropenyl-2-cyclohexen-l-ol) 18, isorobinal (4-isopropenyl-3-oxo-l-cyclohexene-1-carbaldehyde) 19, robi-nal (3-oxo-4-isopropylidene-l-cyclohexene-1-carbaldehyde) 20, a, a -acariolide (3-(4/-methyl-3/-pentenyl)-2(5//)-furanone) 21, a,/ -acariolide (4-(4 -methyl-3 -pentenyl)-2(57/)-furanone) 22, / -acariolide (( )-2-(4/-methyl-3/-pentenylidene)-... 

Catalytic activities were shown to strongly depend on the Ni concentration and the molar ratio of borohydride to nickel170 180 182,183. Ni-B powders showed maximum activity when the NaBPLpNiCla ratio was 1.5 (the rate of the hydrogenation of cyclo-heptene was 4.3 x 10 3 mol g-atom Ni-1 s 1 303 K, 1 atm H2)184. When the synthesis, in contrast, was performed in the presence of PVP serving as a protective polymer, a threefold excess of NaBILj was required to achieve maximum activity (191 x 10 3 mol g-atom Ni-1 s-1)184. The polymer-protected sample proved to be especially effective in the hydrogenation of compounds with isopropenyl group (2-methyl-1-hexene and a-methylstyrene). 

Azines of certain carbonyl compounds like 3 methyl-5-alkyl-2-cyclo-hexen-l-ones and the alkylated l>tetralones have been aromatized to the corresponding 3 methyl-3-alkylanilines and l aminonaphthalenes by boiling with a palladium-carbon catalyst in triethylbenzene. The yields in the first step are in the range 24% to 74% and in the second 20% to 55%. 

PCoWu0395 (R)-(+)-limonene, 4-vinyl-l-cyclo hexene, 1 -methyl-1,4-cyclohexadiene Epoxides o2 MeCN or CH2C12 Aldehyde reductant quite selective 400... 

Both 5-methyl-l-phenyl-6-en(fo-[(Z)-prop-l-enyl]bicyclo[3.1.0]hexane ][(Z)-13] and the corresponding -isomer are formed on irradiation of 3-methyl-1-phenyl-3-[(Z)-prop-l-enyl]cyclo-hexene (12). °... 

Hydroxy-2,6,6-trlmethyl-4-oxo-2-cyclo-hexen-1-yl)-3-methyl-2,4-pentadlenoIc acid... 

M ethyl-1 -morpholino-cyclohexene (81) l-Dimethylamino-6-methylcydohexene (278) l-Diethylamino-6-methyl-cyclohexene (279) 6-Methyl-1 -( -methyl-JV-phenylamino)cyclo-hexene (280)... 

Carvone. 2-Methyl-S-U-methylethenyl)-2-cyclo-hexene-I-one p-mentha-6,8-dien-2-one I -methyl-4-iso-... 

Among the cases in which this type of kinetics has been observed are the addition of HCl to 2-methyl-1-butene, 2-methyl-2-butene, 1-methylcyclopentene," and cyclo-hexene. The addition of HBr to cyclopentene also follows a third-order rate expression. The TS associated with the third-order rate expression involves proton transfer to the alkene from one hydrogen halide molecule and capture of the halide ion from the second, and is an example of general mechanism D (Ad S). Reaction occurs through a complex formed by the alkene and hydrogen halide with the second hydrogen halide molecule. 

Hexobarbital is prepared by reacting together methyl urea and methyl-a-methyl-a-cyclo-hexen-1-yl-a-cyano acetate when an open-chain ureide is formed as an intermediate with the elimination of a molecule of methanol. This upon hydrolysis affords spontaneous closure of the ring thereby resulting into the formation of hexobarbital. 

It is prepared by the interaction of urea with methyl-2-ethyl-a-cyclo-hexene-l-yl-a-cyano acetate in the presence of sodium ethoxide when a molecule of methanol is eliminated with the formation of an open-chain ureido which upon hydrolysis results into spontaneous ring closure and gives rise to cyclobarbital. 

A. 3-Methyl-2-cyclohexen- -ol 2-Cyclohexen-l-ol, 3-methyl-]. A solution of 33.6 g. (0.305 mole) of 3-methyl-2-cyclohcxen-l-one [2-Cyclo-hexen-l-one, 3-methyl-] (Note 1) in 600 ml. of anhydrous ether is placed... 

Methyl-4-cyclo-hexene- 1,2-dicarboxy-lic acid anhydride 200 50 170 2.0 1... 

Ligustral ((methyl-(2,4(3, 5)-dimethyl-3-cyclo-hexen-l-yl)-methylene anthranilate) 5% pet Larsen et al. 1996... 

Methyl-3- [4-isopropyl-irtienyl]-cyclo hexen-(4 er 5) 5, 2. 2.0yclohexyl-5.6.7.8>tetrahydro-naph(haltn... 

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