... (3) D'Silva, TDJ Recent Advances in the Chemistry of Insect Control; Janes, NF, Ed.; Spec. ... The organic layer was dried over MgSO, and the solvent removed to give a residue that after chromatography (3:2 petroleum ether-ether) furnished 0.202 g (66%) of 4b. ... Page 4. J. Org. ...