u00b0 c over the next 0 5 hour after 3 hours 233 g teos was added and the rapidly stirring mixture was held at a 123 u00b0 c oil bath temperature until the particles had broken up to a fine grey slurry the oil bath temperature was then allowed to rise as the pot temperature rose through a region of apparently sticky product at about 145 u00b0 c then to 165 u00b0 c where heating was stopped and the stirring mixture capped and the slurry allowed to cool the mixture was filtered and the solids washed three times with isooctane then dried under moving nitrogen yield 28 0 g 97 6 of theory microscopic examination revealed transparent particles in the 10 to 30 micron range with the mode about 14 micron magnesium powder 50 mesh 6 1 g 0 25 mol was slurried in 85 g of ethanol then 0 24 g of bromine 3 0 mmol and 1 7 mmol ferric chloride in ethanol were added after effervescence had become vigorous 55 g of toluene was added and the mixture was placed into a 45 u00b0 c oil bath and stirred vigorously after 3 hours 225 g teos was added and the rapidly stirred mixture was slowly heated to a pot temperature of 153 u00b0 c where heating was stopped the vessel was capped and the slurry allowed to cool maintaining rapid stirring the mixture was filtered and the solids washed three times with isooctane then dried under moving nitrogen yield 28 8 g 100 of theory microscopic examination revealed transparent particles in the 10 to 35 micron range with the mode about 17 micron magnesium ethoxide 8 2 g 72 mmol was.