2β-Acetoxy-1α-acetoxymethyl-5,5-dimethyl-1α,6α,10Oα-bicyclo[4.4.0]decane-10-spiro-2′-oxiran (4) has been prepared from 4,4-dimethylcyclohex-2-enone in eight steps, one of which involves a useful Lewis acid-catalysed cyclisation of an acetylenic β-oxo-ester (7). The structure of (4) was determined by X-ray crystallography. At a concentration of 1 000 p.p.m. compound (4) showed a 72% inhibition of feeding
2β乙酰氧基1α乙酰氧基甲基-5,5-二甲基1α,6α,10 ö α -二环[4.4.0]
癸烷10 -螺-2'-
环氧乙烷(4)已经从4,4-二甲基制备-2-烯酮分八个步骤进行,其中一个步骤涉及有用的
路易斯酸催化的炔属β-氧代酯的环化反应(7)。通过X射线晶体学确定(4)的结构。在浓度为1000 ppm时,化合物(4)显示出对南方蝗的摄食抑制作用为72%。