Appeal No. 1996-3017
Application No. 08/851,810
Takuya Akiyama et al. (Takuya), "A New Method of Pyrazine
Synthesis for Flavor Use," 26 Journal of Agricultural and Food
Chemistry no. 5, 1176-79 (1978)
Dennis J. Bell et al. (Bell), "Diazabenzenes. II. Synthesis,
Photolysis and Mass Spectra of Some Tetraalkylpyrazines,"
32 Australian Journal of Chemistry 1281-300 (1979)
George P. Rizzi, "Formation of Pyrazines from Acyloin
Precursors under Mild Conditions," 36 Journal of Agricultural
and Food Chemistry no. 2 (1988)
Appellant's claimed invention is directed to a process
for preparing and isolating alkyl-pyrazines, e.g., tetra-
alkyl-pyrazines. The process entails heating and refluxing an
aqueous solution comprising ammonium ions and an acyloin
compound of the recited formula, adding a base to the reacted
mixture to adjust the mixture to an alkaline pH, adding water
to dissolve a solid material that is separated from the
reacted mixture, and allowing the product to crystallize from
the solution. The process defined by the embodiment of claim
6 involves heating, refluxing and subliming an aqueous medium
containing ammonium ions and the acyloin compound, and
collecting the sublimed product on a cooled collection
surface.
Appellant submits at page 7 of the principal brief that
separate arguments are presented for claims 2, 5 and 6.
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