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5244936 
Journal Article 
Study on organotin-catalyzed decomposition of methyl N-phenyl carbamate 
Dai, YS; Wang, Y; Yao, J; Wang, QY; Liu, LM; Cui, LL; Zhao, YF; Wang, GY 
2007 
Yes 
Huaxue Xuebao / Acta Chemica Sinica
ISSN: 0567-7351 
65 
11 
1064-1070 
Chinese 
WOS:000247499000011 
The synthesis of phenyl isocyanate (PI). was studied by thermal decomposition of methyl N-penyl carbamate (MPC) over tin catalysts. It has been found that di-n-butyltin oxide had higher activity. The unknown byproduct was determined as diphenylcarbodiimide (DPCD) by HPLC-MS. The results show that the formation of N,N'-diphenylurea (DPU) and DPCD are the main competitive reactions to the synthesis of PI. At normal pressure, the conversion of MPC is 85.17% and the yield of PI is 67.65% over Bu2SnO under the optimal reaction condition, which is as follows: solvent, o-dichlorobenzene (ODCB); m(ODCB)/m(MPC) = 15; n(Bu2SnO)/n(MPC) = 0.075; reaction time, 1 h. 
Chemistry; methyl N-phenyl carbamate, phenyl isocyanate, catalytic decomposition,; di-n-butyltin oxide; dimethyl carbonate, thermal-degradation, polyurethane, isocyanates,; mechanism, aniline 
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