| 摘要 |
1,252,714. #-Carotene derivatives. RHONEPOULENC S.A. 15 Jan., 1970 [17 Jan., 1969], No. 2111/70. Heading C2V. Retro-dehydro-#-earotene is prepared by (i) reacting #-carotene with N-bromosuccinimide followed by (ii) dehydrobrominating the resulting brominated derivative by means of an alkali metal iodide and reducing iodine then present in the reaction mixture with an alkali metal thiosulphate Examples are given. |
