| 摘要 |
<p>The invention comprises 3,5-di-tert.-butylphenyl N-methylcarbamate, which may be prepared (1) by reaction of methylamine with a 3,5-di-tert.-butyl-phenyl haloformate, which may be prepared in situ from the phenol and phosgene, (2) by reaction of 3,5-di-tert-butylphenol with methyl isocyanate, (3) by reaction of methylamine with a 3,5-di-tert.-butyl-phenyl carbonic acid ester, (4) by reaction of 3,5-di-tert.-butylphenol with an N-methylcarbamoyl halide, (5) by reaction of 3,5-di-tert.-butyl phenol with another ester of N-methylcarbamic acid, or (6) by methylation of 3,5-di-tert.-butyl-phenyl carbamate. Examples of methods 1,2 and 4 are given. The product is useful as an insecticide (see Division A5).ALSO:As a component of insecticidal compositions, particularly of sheep dips, use is made of 3,2-ditert.-butylphenyl N-methylcarbamate (see Division C2). The compound may be formulated in known manner as a dispersible powder or a miscible liquid with the aid of diluents or carriers, a number of which are specified. Examples and comparative experimental results are given.</p> |
