Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... A successful trapping of 1-azetin-4-one with siloxydienes as cyclocondensation adducts is described. ... A cycloadduct has been observed from the reaction of 4-chloro-3-bromo-2-azetidinone 1 (X=CL, R=BR) with 1-ethoxy-1,3-di(trimethylsiloxy)-1,3-butadiene in the absence of ...