Limonene, inactive

Synonyms cas iss-se-s cinene limonene, inactive cajeputene dipanol kautschin Diphenylatmne Chloroarsine... 

For the identification of limonene, one of the most useful compounds is the crystalline tetrabromide, Cj(,HjgBr. This body is best prepared as follows the fraction of the oil containing much limonene is mixed with four times its volume of glacial acetic acid, and the mixture cooled in ice. Bromine is then added, drop by drop, so long as it becomes decolorised at once. The mixture is then allowed to stand until crystals separate. These are filtered off, pressed between porous paper, and recrystallised from acetic ether. Limonene tetrabromide melts at 104 5° and is optically active, its specific rotation being + 73 3°. The inactive, or dipeutene, tetrabromide melts at 124° to 125°. In the preparation of the tetrabromide traces of moisture are advisable, as the use of absolutely anhydrous material renders the compound very diflftcult to crystallise. 

Limonene forms a monohydrochloride, which is a liquid, and which exists in both optically active modifications. By the action of moist hydrochloric acid on the acetic or alcoholic solution of limonene, no optically active dihydrochloride is formed, the terpene becoming inactive and dipentene dihydrochloride, C (,H,g2HCl, results. This body is prepared when limonene is mixed with half its volume of glacial acetic acid, and a current of hydrochloric acid gas is passed over (not into) the well-cooled liquid, with frequent shaking. The resulting mass is pressed on a porous plate, dissolved in alcohol, and precipitated with water. It melts sharply at 50°. 

Dipentene, the inactive form of limonene, not only occurs naturally in essential oils, but results by the action of heat on several other ter-penes, and to a considerable extent by the action of sulphuric acid on pinene. 

The catalyst obtained via anion exchange with the commercial resin Amberlite lRA-900 showed excellent selectivity in epoxidation of acid-sensitive natural terpenes and allylic alcohols [73-75]. The selectivity of 92% at 83% conversion was attained in epoxidation of a-pinene and limonene. The catalytic activity of the reused catalyst was completely maintained after several catalytic cycles, and the filtrate was catalytically inactive [75]. 

Tanabe el al. studied in detail the catalytic action and properties of metal sulfates most of the sulfates showed the maximum acidity and activity by calcination at temperatures below 500°C, with respect to the surface acidity and the acid-catalyzed reaction (118, 119). Other acid-catalyzed reactions were studied with the FeS04 catalyst together with measurement of the surface acidity of the catalyst the substance calcined at 700°C showed the maximum acidity at Ho s 1.5 and proved to be the most active for the polymerization of isobutyl vinyl ether, the isomerization of d-limonene oxide, and the dehydration of 2-propanol (120-122). It is of interest that the catalyst calcined at a slightly higher temperature, 750°C, was completely inactive and zero in acidity in spite of the remarkable activity and acidity when heat treated at 700°C. 

Smith et al. (14) have claimed that different temperatures of solution of the inactive portion of the alloy, different temperatures and lengths of digestion, and different methods of washing have little effect on the catalytic activity as measured by the rate of hydrogenation of d-limonene. In their procedure the alcohol was evaporated under vacuum from the catalyst after which the terpene was added. With the probable large loss of hydrogen under these conditions, it is doubtful that these authors were investigating actual Raney nickel of the W-6 type. 

CAJEPUTENE CINENE DIPANOL DIPENTENE INACTIVE UMONEiNE KAUTSCHIN LIMONENE dl-LIMONENE l,8(9)-p-MENTHADI-ENE 1-METHYL-4-ISOPROPENYL-1-CYCLOHEXENE... 

The substituted limonene cannabidiol (334) is a psychotomimetically inactive constituents of Cannabis, and its irradiation has been studied using various light sources. In methanol, the main product is a 1-methoxy-compound formed by addition of methanol, but in cyclohexane a mixture containing A THC, A iso-THC (335), a photoreduction product (8,9-dihydrocannabidiol), and 3 -cyclo-hexylcannabidiol (336) is obtained. ... 

Oil of Peppermint. Col perm in Mintec. Steam-distilled, volatile oil from fresh flowering plant Mentha piperita L, Labiatae. The Japanese oil, also known as oil of Poho, is the liq portion remaining after the separation of menthol from the oil of Mentha arvensts L., Labiatae. Constit Not less than 50% total menthol including 5 -9% esters ealed as menthyl acetate menthyl isovalerate, menthone, inactive pinene, /-limonene, cadinene, phellandrene, some acetaldehyde, isovaleric aldehyde, amyl alcohol, dimethyl sulfide. 

Synonyms Cajeputene Cinene Cyclohexene, 1-methyl-4-(1-methylethenyl)- Dipanol Dipentene (INCI) Inactive limonene 4-lsopropenyl-1-methyl-1-cyclohexene ( )-Limonene 1,8(9)-p-Menthadiene dl-p-Mentha-1,8-diene p-Mentha-1,8-diene ( )-1,8-p-Menthadiene 1-Methyl-4-isopropenylcyclohexene 1-Methyl-4-isopropenyl-1 -cyclohexene 1 -Methyl-4 (1-methylethenyl) cyclohexene Racemic limonene... 

Inactive limonene. See dl-Limonene Incense EA] Incense H] Incense. See Olibanum Incense extract. See Olibanum (Boswellia carterii) extract... 

---