Scheme 1. 1H NMR (500 MHz, CDCl3) Spectrum of 1 (A) and 2 (B).
Conditions: (i) bis(2-(2-(2-(2-azidoethoxy)ethoxy)ethoxy)ethyl)malonate, CBr4, 1,8-diazabicyclo[5,4,0]undec-7-ene (DBU), o-dichlorobenzene under argon, 3 days at room temperature.
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