p. 9648 - 9653
(2007/10/03)(2008/06/13)
p. 3187 - 3194
(2007/10/02)p. 2235 - 2238
(2007/10/02)ethyl acetoacetate
1,3-dibromo-propane
ethyl hydrogen cyclobutane-1,1-dicarboxylate
diethyl cyclobutane-1,1-dicarboxylate
Cyclobutan-1,1-dicarbonsaeure-ethylester-chlorid