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General procedure: 5.1g (0.21mol) of Mg chips and 50ml of absolute ether are heated under reflux, to which a solution of 8g (0.051mol) of p-methoxybenzyl chloride in 50ml of ether is added drop by drop in 1.5-2h with rigorous stirring. ( optionally several ml of the solution are added, so that the reaction is initiated. ---- unfinished |
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Thus the color change( Farbspiel?) described in (a) can be observed and therefore the required amount of the ketone is controllable. Finally the reaction mixture is treated with 50ml of ether, stirred for an additional 30 min. with heating and is worked up as (a). The crude products are dissolved in a little ethanol ( optionally acetone) and kept in a cooling tank for at least 15h to crystallization. Yield, Rf-value m.p., and analyses, see Tab.1. complete |
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