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HERO ID
5244936
Reference Type
Journal Article
Title
Study on organotin-catalyzed decomposition of methyl N-phenyl carbamate
Author(s)
Dai, YS; Wang, Y; Yao, J; Wang, QY; Liu, LM; Cui, LL; Zhao, YF; Wang, GY
Year
2007
Is Peer Reviewed?
Yes
Journal
Huaxue Xuebao / Acta Chemica Sinica
ISSN:
0567-7351
Volume
65
Issue
11
Page Numbers
1064-1070
Language
Chinese
Web of Science Id
WOS:000247499000011
URL
http:///www.scichina.com
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Abstract
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.
Keywords
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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