1-(1-Isocyanato-1-methylethyl)-3-(1-methylethenyl)benzene → Coumarin

Participants

Reaction Steps

In this scheme, m-(2-isocyanatoprop-2-yl)-α-methylstyrene (23) and m/p-methylstyrene (24) are polymerised under the action of AIBN as free-radical initiator in toluene at 100 to 110° C. to yield the copolymer (25). The preferred molar proportion x of comonomer (23) is between 0 and 60%. The copolymer (25) obtainable in this manner reacts with 3-(6-hydroxyhexoxycarbonyl)-7-diethylaminocoumarin (26) in the presence of catalytic quantities of dibutyltin dilaurate (DBZD) in refluxing methylene chloride, wherein the copolymer (27) may be obtained with a lateral coumarin luminophore (Et=ethyl).

Provenance & Evidence