in tetrahydrofuran boiling, 4h;;

HCl in diethyl ether addn. of 1,5-dibromopentane in dry ether to Mg turnings, slow addn. of diphenyl tin dichloride in dry ether (room temp.), refluxing (3 h), cooling, hydrolysis by pouring in ice-cold 1M HCl; decanting of organic layer, washing (10percent KF soln.), decanting, drying (MgSO4), removing of solvent, distn. of residual oil (395-398 K, 13 Pa); elem. anal.;

in diethyl ether

zinc(II) chloride

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