| 摘要 |
1352467 Thiazolines L GIVAUDAN & CIE SA 29 June 1972 [30 June 1971] 30522/72 Heading C2C [Also in Division A2] #<SP>3</SP>-Thiazolines of the general formula wherein R represents a C 3-7 alkyl group; the benzyl group or the 2-methylthioethyl group are claimed per se and are prepared by reacting an aldehyde of general formula with ammonia or an ammonium salt and α- mercaptoacetaldehyde. The α-mercaptoacetaldehyde may be generated in situ from, e.g. the dimer (bis-mercaptoacetaldehyde by reaction with, e.g. NaHS. The reaction may be carried out in the absence or presence of a solvent e.g. alcohols, ethers, hydrocarbons, amines, amides, water or liquid ammonia. If the reaction is carried out in an organic solvent, anhydrous sodium sulphate is expediently used as a water removing agent. The reaction may be carried out at about- 30‹ to 100‹ C. for 5 minutes to 24 hours. |
