(+/-)-Bis-tetralone (BisT) crystallizes as a stable conglomerate that can be resolved by preferential crystallization. This preferential crystallization was performed by autoseeded polythermic programmed preferential crystallization (AS3PC) and autoseeded preferential crystallization induced by solvent evaporation (ASPreCISE) variants in dirnethylformamide and dichloromethane. Prior to performance of these resolutions, an extensive purification was necessary because the presence of impurities had a strong negative impact on the stereoselective crystal growth. Moreover, the presence of multiepitaxy phenomena required a vigorous stirring during the preferential crystallization in order to avoid a poor optical purity of the crops. Several preferential crystallization attempts demonstrate that ASPreCISE is recommended when there is an unfavorable variation of solubility versus temperature or when chemical degradation occurs on heating.
在翻译过程中需要关注的专业术语和术语:
1. `(+/-)-Bis-tetralone (BisT)`:双甲基酮(BisT)
2. `conglomerate`:共晶、多晶簇
3. `preferential crystallization`:定向结晶
4. `auto
SEeded polythermic programmed preferential crystallization (AS3PC)`:自种多热程序定向结晶
5. `auto
SEeded preferential crystallization induced by solvent evaporation (A
SPreCI
SE)`:溶剂蒸发诱导的自种定向结晶
6. `dimethylformamide`:二甲基甲酰胺(
DMF)
7. `dichloromethane`:
二氯甲烷(DCM)
8. `stereo
SElective crystal growth`:立体选择性晶体生长
9. `multiepitaxy phenomena`:多晶现象
10. `vigorous stirring`:剧烈搅拌
11. `optical purity`:光学纯度
12. `solubility versus temperature`:溶解度随温度变化
13. `chemical degradation`:
化学降解
翻译:
`(+/-)-双甲基酮(BisT)结晶时形成稳定的多晶簇,可通过定向结晶法进行拆分。此次定向结晶采用了二甲基甲酰胺和
二氯甲烷中的自种多热程序定向结晶(AS3PC)和溶剂蒸发诱导的自种定向结晶(A
SPreCI
SE)变种。在进行这些拆分操作之前,必须进行大量纯化,因为杂质的存在对立体选择性晶体生长有强烈的负面影响。此外,由于多晶现象的存在,在定向结晶过程中需要进行剧烈搅拌,以防止收获物光学纯度低。多次定向结晶尝试表明,当溶解度随温度变化不利或加热导致
化学降解时,推荐使用A
SPreCI
SE方法。`