Glycerol 1,2-and 1,3-dinitrateJ prepared from the corresponding dibromohydrins of glycerol, are characterised by reaction with aromatic acid chlorides. The 1,Z-dinitrate is also obtained by the action of iodinesilver nitrate on allyl alcohol; derivatives of the dinitrate are prepared similarly from allyl esters and by nitration of l-glycerides. Partial nitration of glycerol gives glycerol 1,3-dinitrate, also obtained by mild nitration of glycidol (2,3-epoxypropan-l-o1) nitrate. Denitration of glycerol trinitrate by sodium nitrite or potassium hydroxide in aqueous ethanol and by sulphuric acid confirms that the secondary nitric ester group is displaced more readily.

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Nucleophjlic substitution in decaborane (Bl,,H14) by the action of methylor ethyl-lithium has been studied. The principal product is G-methylor 6-ethyl-decaborane, but in the case of methylation small amounts of 5-methyl-, 6,5(or 8)-dimethyl-, and G,9-dimethyl-decaborane are also formed. Charge distribution in decaborane is discussed with respect to these compounds.A STUDY of electrophilic alkylation l e a of decaborane (I) by Friedel-Crafts reaction has indicated that the order of decreasing electron density in the molecule is 2,4 > 1,3 > 5,7,8,10 > 6,9. It is possible to confirm this result by a 9 @ 3 6 study of nucleophilic reactions wherein the attacking species would be