1,2-Dihydronaphthalene, with iodine

Dihydronaphthalene, with iodine isocyanate and methanol to give methyl (/r[Pg.72]

A suspension of Ag-cyanate in abs. ether treated with dihydronaphthalene, then iodine in abs. ether added dropwise with stirring and ice-salt cooling in the dark, Agl removed by filtration, and the resulting soln. of 2-iodo-l-telralyl... 

Treatment of -lonone (13) in Water. Traditional methods for the dehydration of a- and p-ionones to give ionene (14) have involved catalysis by hydriodic acid along with small amounts of phosphorus, or distillative heating in the presence of 0.5% iodine (18). This latter procedure is now known to co-produce about 10% 1,1,6-trimethyl-1,2-dihydronaphthalene (19). However, we have found that the cyclization could be effected by merely heating p-ionone in water at 250 °C for twenty minutes in the MBR. The microwave-assisted reaction was not optimized, and proceeded with only moderate conversion. Unlike in the literature method (18), however, the work-up did not require exhaustive washing procedures. 

Berthelot prepared ethylene iodide from ethylene/ but it had been prepared from ethylene and iodine by Faraday (1821, see p. 104). Berthelot discovered dihydronaphthalene/ tetrahydronaphthalene was discovered by Baeyer/ Berthelot discovered fluorene, C13H10, in crude anthracene and heavy coal-tar oil and named it on accountof its magnificent violet fluorescence, which is very faint with the pure substance. He discovered acenaphthene,... 

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