Nitrogen-Containing Essential Oil Constituents

Methyl anthranilate 172 (Structure 4.51) is found in the oils of sweet orange, lemon, mandarin, bergamot, neroli and ylang-ylang oils and jasmine and tuberose absolutes. Methyl N-methyl anthranilate 173 is the main constituent of mandarin petit grain oil, and occurs also in bitter orange, mandarin and rue oils. 

Indole 174 and 3-methyl indole (skatole) 175 (Structure 4.52) are cyclic im-ines and have a rather unpleasant faecal odour. 

2-Methoxy-3-isobutylpyrazine 176 (Structure 4.53) is found in galbanum oil obtained from Ferula galbaniflua. 2,4-disubstituted pyridines 177, N,N-dimeth-ylated amino compounds 178, alkyl pyrazines 179, quinoline 180 and methyl quinolines 181 were isolated from fig leaf absolute [64]. 

Pyridines 177 and pyrazines 179 have been detected in black pepper, sweet orange and vetiver oils [1-4, 21-23, 54, 65]. 

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