Dipropargyl oxalate

Propargyl radical was produced by vacuum pyrolysis (900-1050°C, 10" -10 Torr) of propargyl iodide or of dipropargyl oxalate (Korolev et al., 1989) and it was frozen into an argon matrix at 12 K (15). Twelve bands were observed in the matrix IR spectrum of the C3H3 radical [only three bands were recorded earlier (Jacox and Milligan, 1974) for this radical] 3307, 3111, 3026, 2080, 1440, 1369, 1061, 1017, 686, 618, 532, 482 cm . Based on the experimental IR spectrum, a normal coordinate analysis has been carried out and a valence force field calculated (Table 6). Stretching frequencies of the carbon skeleton [v(C=C) 2080 cm and p(C—C)... 

In 2000, Ube Industries, Ltd. discovered that oxalates such as dipropargyl oxalate (20) and methyl propargyl oxalate (21) can be used as additives in small quantities [57]. Furthermore, in 2001, Mitsubishi Chemical Corporation discovered that oxalates such as diethyl oxalate (22) can be used as additives in small quantities for LIBs [58]. In 2003, Ube Industries, Ltd. discovered that asymmetrical oxalates, such as ethyl methyl oxalate (23), can be combined with VC (1) [59]. 

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