TY - JOUR
T1 - Effect of polar aprotic solvents and organometallic catalysts on the reaction of alcohols with isocyanates
AU - Dabi, S.
AU - Zilkha, A.
PY - 1980
Y1 - 1980
N2 - DMF and DMSO catalyse the reaction of butanol with PhNCO but inhibit that with aliphatic isocyanates, due to formation of an active 1:1 charge transfer complex with the aromatic isocyanate. Similarity was found in the mode of catalysis of the urethane reaction with these solvents to that with tert, amines. Various organometallic compounds were tested as catalysts for urethane formation with aliphatic isocyanates. Those that gave fast addition to the NCO group, such as tributyltin oxide, Zr(OBu)4 and Zr(acac)4, were the strongest catalysts. In the presence of organometallic catalysts, urethane formation was the sole reaction and trimerization of the isocyanate was suppressed.
AB - DMF and DMSO catalyse the reaction of butanol with PhNCO but inhibit that with aliphatic isocyanates, due to formation of an active 1:1 charge transfer complex with the aromatic isocyanate. Similarity was found in the mode of catalysis of the urethane reaction with these solvents to that with tert, amines. Various organometallic compounds were tested as catalysts for urethane formation with aliphatic isocyanates. Those that gave fast addition to the NCO group, such as tributyltin oxide, Zr(OBu)4 and Zr(acac)4, were the strongest catalysts. In the presence of organometallic catalysts, urethane formation was the sole reaction and trimerization of the isocyanate was suppressed.
UR - http://www.scopus.com/inward/record.url?scp=0006000026&partnerID=8YFLogxK
U2 - 10.1016/0014-3057(80)90128-7
DO - 10.1016/0014-3057(80)90128-7
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AN - SCOPUS:0006000026
SN - 0014-3057
VL - 16
SP - 475
EP - 478
JO - European Polymer Journal
JF - European Polymer Journal
IS - 6
ER -