Synthesis 1:
Into a 5-L round-bottomed flask prepare a solution of 1062 g of sodium azide and 2450 g of 3-bromomethyl-3-methyloxetane in 1972 mL of water.  Heat this solution to reflux for 48 hours while stirring vigorously.  Allow the solution to cool to room temperature and the layers to separate.  Decant off the organic layer and wash it by mixing three times with 1000 mL of water.  The organic layer of pure AMMO can be dried by storing over molecular sieves.  Final yield is about 85%.
To polymerize the AMMO this procedure can be used:  Into a flame dried 5-L round-bottomed flask protected by an inert argon atmosphere prepare a mixture of 14.94 g of butanediol and 1.34 mL of dry methylene chloride.  Add to this mixture 11.77 g of borontrifluoride-etherate and let the reaction proceed for 1 hour at room temperature.  The flask is then cooled to -10 C and 937.78 g of AMMO is added.  The flask is allowed to warm to room temperature and is left for three days while the polymerization commences.  The reaction is quenched by adding 50 mL of saturated sodium chloride solution.  The organic layer is decanted off and shaken with 100 mL of 10% sodium bicarbonate solution in a separatory funnel.  The solvent is removed by aspiration and the resulting liquid is poured into 5 L of methyl alcohol to precipitate the polymerized AMMO.  Filter to collect the polymer crystals and dry them under vacuum at 30 C.

Synthesis 2:
Prepare a solution of 10.1 g of 3-chloromethyl-3-methyloxetane, 6.5 g of sodium azide, and 0.308 g of tetra-n-butylammonium bromide in 27 mL of water.  Reflux this solution at 96-103 C for 4.5 hours.  Allow the solution to cool to room temperature and extract it with 25 mL of methylene chloride in a separatory funnel.  The extract is poured through a column containing 10 g of aluminum oxide and the column is rinsed with additional methylene chloride.  The combined solvent is gently heated to evaporate it leaving crystals of AMMO behind.  Final yield is about 9.85 g or 93%.  The AMMO may be polymerized as in the procedure given above.

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