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In addition to o-cymene, there are two other geometric isomers called m-cymene, in which the alkyl groups are meta-substituted, and p-cymene, in which they are para-substituted. p-Cymene is the only isomer found in nature. The three isomers form the group of cymenes. Cymenes can be produced by alkylation of toluene with propylene. [1] [2]
The biodegradation of p-Chlorocresol [8] is done in the liver, and then excreted primarily via the kidneys or in smaller amounts through the lungs. In facultative Thauera sp. strain DO, p-Chlorocresol was degraded aerobically either by dehalogenation followed by catechol degradation pathway, or methyl oxidation to 4-chlorobenzoate. [9]
Ocimenes are a group of isomeric hydrocarbons.The ocimenes are monoterpenes found within a variety of plants and fruits. α-Ocimene and the two β-ocimenes differ in the position of the isolated double bond: it is terminal in the alpha isomer.
ch 3 c 6 h 5 + 2 ch 3 ch=ch 2 → ch 3 c 6 h 4 ch(ch 3) 2 These alkylations are catalyzed by various Lewis acids , such as aluminium trichloride . m- and p-Cymene are mainly of interest as precursors to the respective cresols , which exploits the Hock rearrangements .
In addition to p-cymene, two less common geometric isomers are o-cymene, in which the alkyl groups are ortho-substituted, and m-cymene, in which they are meta-substituted. p-Cymene is the only natural isomer, as expected from the terpene rule. All three isomers form the group of cymenes. Cymene is also produced by alkylation of toluene with ...
Thymol (also known as 2-isopropyl-5-methylphenol, IPMP), C 10 H 14 O, is a natural monoterpenoid phenol derivative of p-Cymene, isomeric with carvacrol.It occurs naturally in the oil of thyme, and it is extracted from Thymus vulgaris (common thyme), ajwain, [4] and various other plants as a white crystalline substance of a pleasant aromatic odor and strong antiseptic properties.
basic aluminium chloride Al 2 (OH) 5 Cl or Al 2 (OH) x Cl 6−x (0<x<6) antitranspirant aluminium hydroxide: Al(OH) 3: opacifying agent; skin protectant aqua water: solvent ascorbyl glucoside: C 12 H 18 O 11: carrier of vitamin C (water-soluble) ascorbyl palmitate: C 22 H 38 O 7: carrier of vitamin C (fat-soluble)
Treatment of [(cymene)RuCl 2] 2 with the chelating ligand TsDPENH gives (cymene)Ru(TsDPEN-H), a catalyst for asymmetric transfer hydrogenation. [2][(cymene)RuCl 2] 2 is also used to prepare catalysts (by monomerization with dppf) used in borrowing hydrogen catalysis, [3] a catalytic reaction that is based on the activation of alcohols towards nucleophilic attack.