Twenty four tetrahydropyran esters were synthesised and tested as attractants toward Blattella germanica and Supella longipalpa in the laboratory by using the choice-chamber method. In general, carboxylates were superior to propionates and acetates. Among the 2-, 3-, or 4-substituted esters, substitution at the 4-position was better than at the other two positions. These results are explained in terms of the receptor model proposed earlier by others.
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Pandey et al. (1994) studied this question.