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ایزوپروپیل
Branched 2-alkenals are often formed as a result of the aldol condensation between two aldehydes (see Section 8.2.1.3, Chapter 8); for example, 5-methyl-2-isopropyl-2- hexenal (woody, lavender) or 5-methyl-2-phenyl-2-hexenal (2), which is otherwise known as cocoa hexenal and is very important in chocolate aroma.
The homologous 2-isopropyl- 3-methoxypyrazine is known as bean pyrazine because it imparts earthy, pea and beany notes to soy milk (Kaneko et al.
Other reported taints in water are attributed to 2-isopropyl-3-methoxypyrazine and 2-isobutyl-3-methoxypyrazine, which are meta- bolites of actinomycetes and soil bacteria.
Methyl substituents can be derived from formaldehyde via the Strecker degradation of glycine, ethyl sub- stituents from acetaldehyde via Strecker degradation of alanine or cysteine (or it can also be lipid-derived), as well as isopropyl, 2-methylbutyl and 3-methylbutyl groups derived from valine, isoleucine and leucine, respectively.
(28), and N-cyclopentyl-2-isopropyl-5-methyl-bicyclo[4.1.0]heptane-7-carboxamide (29),
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