| 摘要 |
The 61-nitro-, 81-nitro-, 81-methoxy-61-nitro-and 81-methoxy-51-nitro derivatives respectively of 1,3,3-trimethyl-spiro (21 H-11-benzopyran-2,21-indoline) are made by condensation of 2-methylene-1,3,3-trimethylindolene in ethanol with 5-nitro-, 3-nitro-, 3-methoxy-5-nitro- and 3-methoxy - 6 - nitro - salicylaldehydes respectively. Specificatio 646,926 and 750,972 are referred to.
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