%0 Journal Article %A Butler, O %A Coxon, JM %A Steel, PJ %T Acid-catalysed dimerization of exo-2-Phenyl-exo-5,exo-6-trimethylenenorbornan-endo-2-ol %J Australian Journal of Chemistry %D 1983/05/01 %V 36 %N 5 %P 955-962 %K %R https://doi.org/10.1071/CH9830955 %U https://www.publish.csiro.au/paper/CH9830955 %X The dimeric products formed by reaction of exo-2-phenyl-exo-5,exo-6-trimethylenenorbornan-endo-2- ol (1) with formic acid at 70ยบ are identified as: (1RS,2RS,6RS,7RS,8RS,1'SR,2'SR,10'SR,11'RS,- 12'RS,16'SR) - 2'- phenylspiro[tricyclo[5,2,1,02,6]decane- 8,9'-pentacyclo[9,5,1,02,10,03,8,012,16]hepta-deca-3',5',7'-triene] (5) and from X-ray diffraction data: (1RS,2RS,6RS,7RS,8RS,l'RS,2'RS,10'RS,-1l'SR,12'SR,16'RS)-2'-phenylspiro[tricyclo[5,2,1,02,6]decane-8,9'-pentacyclo[9,5,1,02,10,03,8,012,16]- heptadeca-3',5',7'-triene] (8) refined to a residual of R 0.069 (1529 observed reflections). The mechanistic implications of the formation of dimers (5) and (8) and the influence of the exo-trimethylene bridge on the dimerization process are discussed.