CHEMISTRY AND INDUSTRY
577The tetiipcriiturc of test 0 and thc cqiiiviscous tctnpcriiturc 0, nrc licrc csprcsscd iii OF., but tlic iictuiil grnduntioiis tting be iii OF., in "C., or in both. In coiistructitig sciilc 111 it is ticccssiiry that c bc ktio\vti for ntiy vnluc of 0,. Tlic
IS?cluliiiitcly .bc*ci~ ~liscovcrctl. tlirtvt cli~~tiiic.ril oviilciii~i~.
Manganese and rhenium ethoxides and isopropoxides, Mn(OR), and Re(OR),, have been prepared by the interaction of the chlorides of the elements with sodium ethoxide and isopropoxide. The products are only stable in dry air, since water very readily hydrolyses them.Compounds of the halides of manganese and rhenium with one molecule of ethyl or isopropyl alcohol have also been obtained.* Average of estimations as Re0,,2H20 and as nitron per-rhenate.
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