Naphthalene esters have been reduced over a nickel-on-kieselguhr catalyst which gives specific reduction to the tetrahydronaphthalene (tetralin) stage. The method is of practical utility, since no monitoring of the hydrogen uptake is necessary.THE LITERATURE contains much information on the reduction of naphthalene and its derivatives to the corresponding tetralin and its derivatives. Nickel catalysts have been prevalent in the reported work (1, 4, 9, 10), though platinum (4) and copper chromite (2, 6) catalysts have also been used.

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The photobromination of 2,6-dimethylnaphthalene gave good yields of 2,6-bis(bromomethyl) naphthalene or 2,6-bis(dibromomethyl) naphthalene. Several new derivatives were prepared from these halogenated compounds via displacement reactions.THE PHOTOBROMINATION of methyl naphthalenes to give exclusively side-chain substituted products has recently been reported (2). The synthesis of some new

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