Dibenzyl Structuresin a Macromolecular Chain. III. Dibenzyldiisocyanates Reactivity |
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Authors: | A A Caraculacu I Agherghinei CR Prisacariu V Cozan |
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Institution: | Institute of Macromolecular Chemistry “P. Poni” Aleea Gr. Ghica , Voda no. 41A 6600, Jassy, Romania |
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Abstract: | The reactivity of the 2,2′-, 2,4′-, 4,4′-dibenzyldiisocyanate (2,2′-, 2,4′-, 4,4′-DBDI) with n-butanol in benzene has been studied. The concentrations of all species were monitored by using high performance liquid chromatography (HPLC). The reactivity of 4,4′-DBDI is similar to that of 4,4′-diphenylmethanediisocyanate (4,4′-MDI). Very strong intramolecular catalytic effects were noticed in the case of 2,2′-DBDI, probably due to the variable molecular geometry. These effects are responsible for the whole reaction pattern. The 2,4′-DBDI NCO ortho and para groups reactivities are different and comparable to that of 2,4-toluylenediisocyanate (2,4-TDI). |
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