OX a'OH have a structure analogous to I) from the interaction of o-cresol and acetone. It appears probable that the o-cresol-acetone product of Siikosd is VI11 in reality, and that it is formed by the elimination of water from VII. If the plausible assumption is made that the bis-1, 1'-spirohydrindenes described in this paper were formed from intermediates similar to VII, then the hydroxyl and methoxyl substituents may be assigned to definite positions with ...
![5,5'-dimethoxy-3,3,3',3'-tetramethyl-2,3,2',3'-tetrahydro-[1,1']spirobiindene-6,6'-diol Structure](https://image.chemsrc.com/caspic/315/32737-29-4.png)
![1,1'-Spirobi[1H-indene], 2,2',3,3'-tetrahydro-5,5',6,6'-tetramethoxy-3,3,3',3'-tetramethyl- Structure](https://image.chemsrc.com/caspic/121/6307-95-5.png)
