Cynnamic ester

Z)-)3-substituted cynnamic esters are formed with retention of the configuration, by the coupling reaction of Z-)3-ayltelluro cynnamic esters with Grignard reagent in the presence ofCul. ... 

Recently, Piancatelli has employed PhSeCl in the presence of zinc chloride to effect the stereospecific chloroselenenylation of electron-poor olefins such as ethyl maleate and fumarate, methyl acrylate and methyl vinyl ketone [52]. The addition occured with good regioselectivity also in the cases of the methyl esters of acrylic, crotonic and cynnamic acids 62 (Scheme 10). In the latter cases, if the... 

Vinylesters are unsaturated, hence thermosetting, resins, prepared by the reaction of a monofunctional unsaturated acid, e.g. methacrylic, acrylic, crotonic or cynnamic acid, with a bisphenol diepoxide. This type of structure is referred to as bisphenol-A epoxy vinyl ester (Fig. 4.3(a)). The structural difference, which at least partially justihes the improved chemical and mechanical properties of vinylester, is the presence in vinylesters of reactive double bonds at the ends of the chains only, while unsaturated polyester resins have the reactive double bonds distributed throughout the chains. 

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