
TY  - JOUR
A1  - Teitei, T 
T1  - Lactonization of o-Arylethenylbenzoic acids: Formation of 3,4-dihydro- 1 H-2-benzopyran-1-ones and isobenzofuran- 1(3H)-ones
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1982
VL  - 35
IS  - 6
SP  - 1231
EP  - 1235
KW  - 
UR  - https://doi.org/10.1071/CH9821231 
N2  - The formation of six 3,4-dihydro-1H-2-benzopyran-1-ones (2a-f) and one isobenzofuran-1(3H)-one (3a) from o-arylethenylbenzoic acids (1) in neutral or acid solution is described. The benzoic acids having a neutral or electron-releasing group on the double bond give &#948;-lactones (2), whereas compounds with a strong electron-withdrawing group give the &#947;-lactones (3). The mechanism is discussed in terms of electronic effects. The rate of cyclization of the (Z)-compound is found to be faster than that of the (E)-compound. 
ER  -

