Human heterocyclic compounds associated

Figure 13. Some heterocyclic compounds associated with meat favor in humans...

Chemically, 1. a. are often alcohols or carboxylic acids and esters derived from alkenes or alkadienes but also terpenoid or heterocyclic compounds may have I. a. activity. In many cases the ratio of ciVfrani-isomers or, in the case of chiral compounds, the enantiomer ratio often plays a decisive role for the effectiveness of La. Many other substances occurring in the environment also have an attracting effect on insects, especially those associated with the search for food examples the typical odors of certain plants (e.g., arum), flower and fruit odors, emanations from animals and humans [CO2, lactic acid, (-)-(/ )-l-octen-3-ol] or carrion. 

Furan derivatives are ubiquitous in nature in a wide variety of structures, but all of them appear in very modest amounts within specific vegetable and animal (including human) species. The interest of these compounds is mostly relevant to phytochemists and other natural product practitioners [1]. The chemistry associated with the furan heterocycle has been the subject of extensive studies over the last century and is sill a very active field of research because of its important repercussions in areas such as synthons, pharmaceuticals and other fine chemicals [2], liquid crystals [3], as well as polymer science and technology [4]. The classic treatise by Dunlop and Peters [5], which placed furan chemistry in a highly visible perspective, was followed by a number of comprehensive reviews and monographs which progressively updated the state of the art [1-4]. 

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