| 摘要 |
<p>1291696 Benzoin derivatives FARBENFABRIKEN BAYER AG 16 Jan 1970 [16 Jan 1969] 2193/70 Heading C2C Compounds of the formula where R 1 and R 2 are H, alkyl, alkoxy or halogen R 3 is optionally substituted alkyl, alkenyl, alkinyl, cycloalkyl, aryl or aralkyl, R 4 is H or optionally substituted alkyl, alkenyl, cycloalkyl, aryl or aralkyl and X or O or S are prepared by reacting a compound of the formula with a suitable electrophilic agent in the presence of a basic catalyst in a dipolar aprotic solvent or between 0‹ and 100‹ C. The invention further comprises racemates of Formula I, wherein R 4 is not hydrogen and R 3 is not aryl.</p> |
