Thermolysis of 4(XH) gives 6a and 6b(XH) in a ratio of 1:4 whereas 4 (XSO2Ph) gives more of the trans-ring junction product 6a(XSO2Ph) suitable for the synthesis of pisiferol [ratio 6a : 6b(XSO2Ph) = 1.5:1].
热分解4(XH)给出图6a和图6b(XH)中的1:4的比例,而4(XSO 2 PH)给出多个的反式型圈结产物6A(XSO 2 PH)适用于合成二十碳四烯
酚[比率6a:6b(X = SO 2 Ph)= 1.5:1]。