| 摘要 |
The invention relates to a new process for the preparation of 1-bromoalkyl hydrocarbyl carbonates. The carbonates according to the invention are prepared by reacting an alpha-chlorinated carbonate of formula <IMAGE> with an anhydrous brominated compound of formula ZBr in which Z represents hydrogen, the group (CH3)3-Si-, the group <IMAGE> or bromine if R2 is other than an aromatic radical, in the presence of a catalyst chosen from the group consisting of heteroaromatic amines, quaternary ammonium or phosphonium halides, hexasubstituted guanidinium halides, alkaline earth metal halides or alkali metal halides in combination with a complexing agent for their cation. The carbonates according to the invention find their preferential applications as blocking agents for some antibiotics or as agents for the synthesis of phosphorus-containing carbonates which can be used as insecticides.
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