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6617662 
Journal Article 
Tin(IV) chloride catalyzed Hetero-Diels-Alder reaction of methyl 2-oxo-4-phenyl-3-butenoate with styrene 
Sera, A; Ueda, N; Itoh, K; Yamada, H; , 
1996 
Yes 
Heterocycles
ISSN: 0385-5414 
PERGAMON-ELSEVIER SCIENCE LTD 
OXFORD 
43 
10 
2205-2214 
English 
Hetero-Diels-Alder reactions of methyl 2-oxo-4-phenyl-3-butenoate with styrene to give dihydropyran derivatives were found to proceed through an exo-selective concerted as well as an ionic stepwise mechanisms concurrently.