
TY  - JOUR
A1  - Vidal, B 
A1  - Conan, JY 
A1  - Lamaty, G 
A1  - Vardin, J 
T1  - Geometry of Some Strained Oxygen Ring Compounds: 1,3-Benzodioxole and 2,3-Dihydro-1,4-benzodioxin (Benzodioxan). Application to the Geometry of (6aR-<I>cis</I>)-3-Methoxy-6a,12a-dihydro-6h-[1,3]dioxolo-[5,6]benzofuro[3,2-C] [1]benzopyran (Pterocarpin)
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1988
VL  - 41
IS  - 7
SP  - 1107
EP  - 1116
KW  - 
UR  - https://doi.org/10.1071/CH9881107 
N2  - The geometry of benzodioxole, benzodioxan and the strained five- membered rings of pterocarpin are studied by the MNDO method. We show that in benzodioxole there is bond alternation towards a Kekule -like structure such as in indan (Mills-Nixon effect). In benzodioxole, owing to the smaller perimeter of the fused ring and enhanced strain, alternation is more pronounced than in indan . An explanation is offered for the strong distortion in ring angles in benzodioxole compared with indan. The effect of strain in benzodioxan and pterocarpin is discussed. 
ER  -

