magnesium in not given Sonication; mixt. of tin derivative, Mg turnings, solvent (Et2O or THF) and few drops of organic bromide was sonicated (ultrasound, 47 kHz, 300W), soln. of organic bromide was added; washed with brine, extd. with Et2O, dried over MgSO4, evapd. in vac., column chromy. (neutral alumina or silica gel, petroleum ether);

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mercury dichloride

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