2- Ethyl-6-methylnaphthalene

Methyl-1,2,3,4-tetrahydro naphthalene Decahydro-2-methylnaphthalene Decahy dro-1 -ethyl-5 -methy lnaphthalene 1 -Methy lperhy drophenanthrene... 

Methylnaphthalene was then used as a vehicle, but even in this case very poor results were obtained, i.e.y conversion to methyl ethyl ketone (MEK) solubles and distillate products was very low. Results of this run are not reported since they are obscured by extensive solvent cracking. 

A further example of the use of 2//-thiopyrans as surrogates for m-substituted dienes involves the use of the protected 3,4-dihydio-3-(3-oxobutyl)A//-thiopyranA-onc, 3-[2-(2-methyl-l,3-dioxolan-2-yl)ethyl]-4-[tris(l-methy-lethyl)silyl)oxy-2//-thiopyran 328 as an equivalent of l-ethenyl-2-methylcyclohexene in Diels-Alder reactions. The thiopyran reacted with various maleimides to yield the endo cycloadducts and with methyl propenoate to give the exo adduct under either thermal or Lewis-acid-catalyzed conditions. In the latter case concomitant release of the protected ketone functions occurs, acid-catalyzed cyclization of which generates a fused cyclohexenone ring (Scheme 67). Desulfurization, preferably before the aldol cyclization, leads to derivatives of 2,3,4,4a,5,6,7,8-octahy-dro-4a-methylnaphthalenes < 1997CJC681 >. 

Potassium-catalyzed ethylation of alkylnaphthalenes proceeds at 90-160° and, besides the normal side-chain ethylation, a cyclialkylation also occurs. From 1-methyl-naphthalene compounds and 20 are obtained, and from 2-methylnaphthalene compound 2fTs obtained. 

Dehydrogenation of the lactone acid (XVII) with palladium-charcoal yielded 2-ethylnaphthalene and under the same conditions the acid X afforded 2-ethyl-3-methylnaphthalene. The formation of these two hydrocarbons disproved the earlier hypotheses that the carbonyl group of himbacine was attached to a tertiary carbon atom and that the ethyl groups of 2-ethyl-6-methylpyridine and 2-ethyl-3-methylnaphthalene, isolated from the selenium dehydrogenation of himbacine, were derived from the same structure in the alkaloid. Moreover, since the results of the Hofmann degradation and the oxidation experiments had shown that the 6-(l,2-dimethylpiperidyl)-vinyl group was attached to a decalin residue by reason of the formation of the C-13 ketones, it only remained to establish the point of attachment. For this purpose the carboxyl group... 

Braungart et al. (1997) have also investigated emissions from 11 electronic devices in their desiccator. All products were operated during or immediately before the test. Unit-specific emission rates ranged from 5.9 pg/h (cellular phone) to 206 pg/h (electric shaver). Emission rates of 7 products were below 27 pg/h. Typical VOCs detected in the chamber air were aliphatic hydrocarbons (C10-C18), aromatic hydrocarbons (toluene, o-, m- and p-xylene, C3-/C4-benzenes), 2-ethyl-1-hexanol, BHT (2,6-di-tert- butyl-4-methylphenol) and cyclohexanone. One electric shaver emitted large amounts of methylnaphthalenes. Emission rates of single compounds were well below 10 pg/h apart from one case in which the emission of 23 pg/h naphthalene from an electric hair drier was measured. 

SO) similar treatment of the decahydronaphthalene (51) gave (52), which reacted with powdered potassium hydroxide at 150 °C to provide 3-ethyl-l,2,5,6-tetrafluoro-7-methylnaphthalene (53) (38%) plus (54) (27%) and (55) (25%). " The high reactivity of amine-co-ordinated copper(n) ions as chlorine-transfer agents is responsible for the excellent yield of the 1 1 adduct CCIs CHa CHCl [CFala CHiCHa (48) in experiments of the type covered by Scheme 18 replacement of the copper... 

Dimethylaminopyridine 4,6-Dinitro-o-cresol Diphenylamine Disodium octaborate tetrahydrate Endosulfan Ethiofencarb 6-Ethoxy-1,2-dihydro-2,2,4-trimethylquinoline 2-Ethylhexanal Ethyl hexanediol 2-Ethylhexenal 2-Ethyl-2-hexenal Ethyl-p-nitrobenzoate Etrimfos Fenamiphos Fenpropathrin Fenthion Fluometuron Furfural Glyoxalic, acid Hexachloro-1,3-butadiene Hexachloroethane Hydramethyinon 2-Hydroxy-2-methylpropanenitrile 2-Imidazolidinone lodofenphos Isofenphos Isooctyl thioglycolate Isopropanolamine Kojic acid Laurie acid Lead acetate Lead acetate trihydrate Lead naphthenate 2,6-Lutidine Mecarbam Mercury chloride (ic) Metam-sodium P-Methylnaphthalene Naphthalene Nicotine Oxamyl Parathion-methyl Pentaerythritol Perchloropentacyclodecane Permethrin Phenothiazine Phenylmercuric acetate Phorate Phosalone Phoxim Phthalic anhydride a-Pinene Pine (Pinus palustris) tar oil Piperazine Piperazine dihydrochloride... 

---