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The key intermediate O,O-dialkylisothiocyanato(phenyl)meth-ylphosphonate 5 was prepared according to the literature procedure[12] . In order to improve the yield, the existing method for conver-sion of4 into 5 was further modi fi ed by using Bis(trichloromethyl) carbonate (BTC) instead of phosphorus oxychloride as shown in Fig. 2 . The results obtained with BTC were compared with those obtained with phosphorus oxychloride (Table 1 ). As could be observed from the table, the yields phosphonate 5 in the former case from different alkyl substituents ranged from 67.4e78.6%. The other intermediates involved in the preparation of 5 were obtained as depicted inFig.2[12].

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