from close interligand, intramolecular hydrogen-hydrogen contacts within three of these palladium complexes were detected by two-dimensional NOE spectroscopy, and were used to determine the absolute configurations at the chiral phosphorus centers in the Ph2PCH2CH2PPh(L-(−)-menthyl) isomers. The conformations of the two chelate rings in the more abundant of these isomers were also determined.
通过用非对映体纯形式的Ph(L -(-)-甲基)CH = CH 2 CH )处理Ph 2 PH来合成新的P-手性膦的两个差向异构体(1-Rp和1-
SP)。
钯(II)络合物,2-
SP,通过用[
钯处理相应的
双膦得到的2
氯2( - (S)ø -CH 6 ħ 4 CHeNMe 2)2]。这些复合物中的每一种均以两种区域异构体的形式存在,它们在手性膦相对于C-供体的取向上不同。从接近interligand约束,这三个
钯络合物的内分子内氢-氢接触通过二维NOE谱检测,并且被用来确定在pH值中的手性
磷中心的绝对构型2 PCH 2 CH 2 PPH(大号- (-)-薄荷基)异构体。还确定了这些异构体中更丰富的两个螯合环的构象。