For a specific asymmetric synthesis, if the product has only one chiral center, when using high-performance liquid phase to quantify its enantioselectivity, if it is not 100% optically pure, there will be The ratio of the peak areas of two enantiomeric peaks is er, that is, enantiomeric ratio. The difference between the two peak areas is the ee value, that is, enantiomeric excess. If the product has two or more chiral centers ( Usually two, any more would be too complicated), the ratio of the peak areas is the diastereomeric ratio, and the difference between the two isomers is the diastereomeric excess.
Abbreviation
DR = Data Register, data buffer register DR = Design Review, design review, often used in "DR meetings", that is, design review meetings DR = Defect Record, error history DR = Dead Reckoning Fully estimated DR= Dong Ruan Neusoft, Pinyin abbreviation, Neusoft employees were filtered by the company to avoid the word Neusoft, so many people just use DR. DR=Dividend Right securities. The securities code is marked with DR, which means ex-rights and ex-dividends. If you buy such a stock, you will no longer have the right to receive bonus shares and dividends. Dr= Doctor, doctor (can also be called doctor) DR=Drow Ranger Dark Ranger. DR=Directed Retry (used in GSM mobile communications. For example: in NOKIA equipment, during the call establishment phase, if the voice channel of a certain cell is congested, we can use the Directed Retry (DR) function to reduce congestion in this cell.) DR=Depository Receipts, Depository Receipts DR=Defender Right football terminology, right back, same as Right Guard. DR=debit record, debit in financial vouchers DR=Draft Resolution, a draft of "Resolution", referred to as DR, which becomes a legal international regulation or agreement when passed, affecting the whole world. The DR is also the final result of the MUN conference, so it has a very important status.