BN1 9QJ3@-Acetoxylanost-8-ene has been photo-oxygenated in the presence of a dye and p-nitrobenzenesulphonyl chloride to yield, among other products, the Criegee rearrangement product 3~-acetoxy-8,9-epoxy-8,9-secolanosta-7,9(1l)-diene (XV; R = Ac) and 3~-acetoxy-7a-hydroperoxylanost-8-ene ( V I I ; R = Ac). These are thought to arise from 3(3-acetoxy-9a-hydroperoxylanost-7-ene (I1 ; R = Ac) ; their transformations are reported. The bridged cyclodeca-I ,6-diene system in (XV) takes part in transannular reactions. t Presed address : Sterling Chemical Laboratory, Yale Univer-For leading references see R. B. Clayton, Quart. Rev., 1965,photo-oxygenation in the presence of P-nitrobenzenesulphonyl chloride so that if any 9ct-hydroperoxide were formed it might be esterified and the resultant peroxyester solvolysed in situ to yield the 9,14-epoxide (111; R = Ac).
Addition of Perbunan 26 or Perbunan 35 to a vinyl chloride resin decreases the amount of ester type plasticizers necessary to obtain equivalent or better physical proper-Tensile, lb./sq. in. 2450 2030 1380 1050 320 Ultimate elongation, % 310 360 330 375 155 Shore durometer hardness 83 83 79 73 69steam to about 280-3000 F. The resin was then fluxed about 2 minutes and allowed to mill with a rolling bank for 5 minutes with occasional cutting. To this plastic at about 280°F. was added the rubber. Mill mixing was continued for about 12 minutes at 280 °F. The batch was then sheeted off the mill at 0.075to 0.15-inch thickness.Molding Method. This operation was carried out in a standard A.S.T.M. four-cavity mold (D15-41) yielding slabs 6 X 6 X 0.075 inch. The molding cycle was 10 minutes at minimum ram pressure at 280°F ., then 10 minutes at 900 pounds per square inch at 280°F. The stock was cooled under pressurein the mold.
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