Patent ID: 7528257

Claim:
A process for preparation of a monomer of formula (I) comprising: reacting in a first solvent an inorganic azide and a divalent zinc salt with a nitrile of formula (II), at a temperature in the range from about 70° C. to about 170° C. for a time period in the range from about 1 hour to about 24 hours, allowing contact of reactants, wherein “X” is a group consisting of at least one of alkyl, aryl, and oligoethers, to form a first composition; cooling said first composition to about room temperature to form a second composition including a di-tetrazole of formula (III), wherein “H” is chemically bonded to N 1 or N 2 of said di-tetrazole; isolating said di-tetrazole by recrystallization or precipitation from a suitable second solvent; and reacting said di-tetrazole in a third solvent with a soluble reversible or non-reversible base and 2-chloro-ethanol at a temperature in the range from about 70° C. to about 150° C. for a time period in the range from about 1 hour to about 24 hours, allowing contact of reactants, to form a third composition; cooling said third composition to about room temperature to form a fourth composition including a difunctional tetrazole diol of formula (I), wherein [R] comprises at least one group of alkyls, aryls, and oligoethers, wherein “R” is chemically bonded to N 1 or N 2 of said tetrazole diol (I).