- Concomitant Desulfurization and Transesterification of Alkyl Thionocarbamates
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Alkyl carbamate (such as 1) reacts with triphosgene at the nitrogen atom, whereas the analogous thionocarbamates (5) react at the sulfur. Subsequent treatment with various phenols or alcohols leads to the corresponding aryl carbamates or alkyl carbamates
- Joshi, Uday M.,Patkar, Laxmikant N.,Rajappa, Srinivasachari
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- Transesterification of alkyl carbamate to aryl carbamate : Effect of varying the alkyl group
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Phosphorus oxychloride mediated transesterification of four alkyl N-methylcarbamates to several aryl N-methylcarbamates has been studied. Best yields are obtained from benzyl N-methylcarbamate.
- Deshpande, Sunita R.,Likhite, Anjali P.,Rajappa, Srinivasachari
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p. 10367 - 10370
(2007/10/02)
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- Contra-thermodynamic trans-esteripication of carbamates by counter-attack strategy: A viable non-phosgene, non-mic route to carbamate pesticides
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Treatment of methyl N-methylcarbaaate (1, R= Me) with phosphorus oxychloride and 1-naphthol results in the formation of the transesterified product, 1-naphthyl N-methylcarbamate (2, Ar=1-naphthy 1) in good yield. Similarly, ethyl N-methylthiocarbamate (5) is converted to 1-naphthyl N-methylcarbamate (2, Ar= 1-naphthyl) on treatment with phosphorus oxychloride and 1-naphthol. The mechanism of these interesting and industrially important transformations is discussed.
- Kulkarni,Naik,Tandel,Rajappa
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p. 1249 - 1256
(2007/10/02)
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