本发明的合成 方法简便直接，从外消旋的螺环二酮出发得到螺环骨架具有不同绝对构型的光 学纯的手性配体。
The synthetic method is simple and convenient and direct; and the spiral ring skeleton obtained from spiro-diketone has optical pure chiral ligand with different absolute configurations.
顺便说一下，如果你好奇为什么在判断牙齿年龄方面、外消旋化会比碳14定义的时钟精度差之甚多，那么部分原因与温度相关。
By the way, if you're curious about why racemization is so much less accurate a clock than C-14 for dating a tooth's age, part of the explanation has to do with temperature.
因此，倘若尸身被置于火场中，会完全扭曲外消旋化技术所判断的牙齿外观年龄——尸身被置于沙漠也同理。
So being in a fire will totally distort a tooth's apparent age via this technique - as might being left in a desert.
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