A mixture of azide
8 (0.252 mmol, 1 eq., 100 mg), alkyne (0.504 mmol, 2 eq.), and Cp*RuCl[(P[Ph.sub.3]).sub.2] (0.005 mmol, 0.02 eq.) in benzene (7mL) was stirred under reflux for 24 h.
A few reasons sodium azide
may have been selected for use in airbags are it releases gas fast, the gas it releases is pure nitrogen (of course, when sodium azide
is mixed with other explosive or pyrotechnic ingredients, the resulting gas composition is altered), and it's fairly stable when it's inside an airbag system under most environmental conditions automobiles encounter.
Poly(ethylene glycol) methyl ether acrylate (PEGMA, [M.sub.n] = 480g/mol, Aldrich) was passed through basic alumina column to remove the inhibitor Ethyl [alpha]-bromoisobutyrate (EBIB, 98%, Aldrich), 2,3,4,5,6-pentafluorobenzyl chloride (Aldrich 99%), CuCl ([greater than or equal to] 99.99%, Aldrich), CuBr (98%, Aldrich), sodium azide
(Na[N.sub.3], Sigma-Aldrich), 2,2-bipyridine (bpy, 99%, Fluka), N, N, N', N", N" -pentamethyldiethylenetriamine (PMDETA, 99%, Aldrich), methanol ([greater than or equal to] 99.9, Aldrich), N, NThicyclohexylcarbodiimide (DCC, 99%, Aldrich), 4-(dimethylamino) pyridine (DMAP, [greater than or equal to] 99.99%, Aldrich), propiolic acid (99%, Aldrich), and N, N-dimethylformamide (DMF, 99%, Aldrich) were used as received.