Solid-state vibrational circular dichroism (SD-VCD) spectra were measured on the ion-exchange adducts of sodium montmorillonite and [Cu(RR- or SS-oxa)]²⁺ as prepared in the presence of a substrate in Michael additions, (E)-2-butenoyl-2-oxazolidinone. Here RR- or SS-oxa denotes RR- or SS-2,2'-isopropylidene-bis(4-phenyl-2-oxazoline), respectively. By comparing the observed and theoretical VCD spectra, it was deduced that the substrate was transformed to a chiral structure in association with the Cu(II) complex within a clay mineral.

中文翻译：

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固态振动圆二色性用于非均相非对称催化：固定在蒙脱土中的铜（II）配合物

固态振动圆二色性（SD-VCD）光谱是在存在于基质中的迈克尔加成反应中制备的蒙脱土钠和[Cu（RR（或SS -oxa）] ²⁺的离子交换加合物上测量的，（E）-2-丁烯酰基-2-恶唑烷酮。这里RR -或SS氧杂表示RR -或SS -2,2'-异亚丙基双（4-苯基-2-恶唑啉），分别。通过比较观察到的和理论上的VCD光谱，可以推断出底物与粘土矿物中的Cu（II）络合物结合转变为手性结构。