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Uma serie de (E)-2-(benzo[d]tiazol-2-il)-3-arilacrilonitrilas foi sintetizada pela condensacao de Knoevenagel assistida por microondas, na ausencia de solvente, partindo do correspondente 2-(benzo[d]tiazo-2-il)acetonitrila e aldeidos aromaticos, contendo tanto grupos doadores de eletrons, como retiradores. Os tempos de reacao foram consideravelmente curtos e os produtos, obtidos em rendimentos moderados (50-75%) e boa pureza. A configuracao da dupla ligacao da acrilonitrila nao pode ser estabelecida por metodos comuns de RMN. No entanto, estudos teoricos sugerem que nesses compostos o isomero E e mais estavel do que o Z, o que esta de acordo com algumas evidencias experimentais. A series of (E)-2-(benzo[d]thiazol-2-yl)-3-arylacrylonitriles was synthesized by microwave assisted Knoevenagel condensation under solvent-free conditions from the corresponding 2-(benzo[d]thiazol-2-yl)acetonitrile and aromatic aldehydes with electrondonating/electronwithdrawing groups. The reaction times were considerably short and the products obtained in moderate yields (50 to 75%) and good purity. The configuration of the acrylonitrile double bond could not be established by regular NMR methods. However, theoretical studies suggest that the E isomer is more stable than Z, which is in good agreement with some experimental evidences.

Microwave-assisted synthesis under solvent-free conditions of (E)-2-(Benzo[d]thiazol-2-yl)-3-arylacrylonitriles