New chiral 3,4,5-triphenyl-1-((1R,2S,5R)-menthyl)oxymethyl-1,2-diphosphole (1) was prepared by reaction of sodium 1,2-diphospholide with chloromethyl (1R,2S,5R)-(−)-menthyl ether. The extent of asymmetric induction in the [4 + 2] cycloaddition reaction of chiral 1 with maleic anhydride was studied and the absolute configuration of the [4 + 2] cycloadducts determined by X-ray structure analysis.

中文翻译：

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3,4,5-三苯基-1-（（（1R，2S，5R）-薄荷基）氧甲基-1,2-二膦酸酯）的合成和不对称[4 + 2]环加成反应

新型手性3,4,5-三苯基-1-（（（1 R，2 S，5 R）-薄荷基）氧甲基-1,2-二磷腈（1）是通过1,2-二磷化钠与氯甲基1 R，2 S，5 R）-（-）-薄荷基醚。研究了手性1与马来酸酐的[4 + 2]环加成反应中的不对称诱导程度，并通过X射线结构分析确定了[4 + 2]环加合物的绝对构型。