| 摘要 |
1,272,874. Benzoic acid lactone derivatives. COMMERCIAL SOLVENTS CORP. 20 Oct., 1970 [16 Feb., 1970], No. 49769/70. Heading C2C. Novel compounds I in which B is C = O, CHOH or CH 2 ; R and R<SP>1</SP> are independently H, 1-6 C alkyl, aralkyl or 2-6 C saturated acyclic acyl and X and Y are H or Cl at least one being Cl are prepared by reaction of corresponding compounds I wherein X and Y are H with sulphuryl chloride. Animal feeds having antibacterial and growthpromoting effect comprise a compound I together with normal nutrients. |
