Methanol → Bis [4-(vinyloxy)butyl]trimethyl-1,6-hexanediylbiscarbamate

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To a 2 L three neck flask equipped with a stopper, dropping funnel, stir bar, and reflux condenser was added trimethyl-1,6-diisocyanatohexane (mixture of 2,2,4- and 2,4,4-isomers, 118.7 g, 0.57 mol, obtained from Sigma-Aldrich, Milwaukee, Wis.), dibutyltin dilaurate (3.56 g, 5.6 mmol, obtained from Sigma-Aldrich) and anhydrous tetrahydrofuran (1 L). 1,4-Butanediol vinyl ether (133.2 g, 1.2 mol, obtained from Sigma-Aldrich) was added slowly dropwise to the stirring solution via the addition funnel. The reaction mixture was brought to reflux and was kept at this temperature until deemed complete by infrared spectroscopy (about 5 hours, confirmed by the disappearance of the isocyanate peak at 2200 cm−1). When the reaction was complete, methanol (500 mL) was added to quench any residual isocyanate and the solution was stirred for 0.5 hour. The solvent was stripped in vacuo and the residual oil was triturated with hexane (3×500 mL), dissolved in methylene chloride (1 L), washed with water (1×750 mL), dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo to afford 221 g of a pale yellow oil (89 percent yield). The product was believed to be a mixture of compounds of the formulae

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