The 2,2'-Spirobichroman-1,1'-spirobiindan-4,4'-diol Rearrangement. II

lhe reaction of 2,2'-spirobichrm derivatives with either hy-drabranic acid in the acetic acid solution or alunLm chloride in the chlarobenzene solution yielded 1,l'-spirobiindan-4,4'4iol analogues.lhe reaction is peculiar as carpared with the reaction of alkyl aryl ethers with the s a w reagents in the s m rredia.Introduction.For all the prevalence of the them1 and the acid-catalyzed Claisen rearrangerent 1 in the synthetic accanplishnts, the conversion of alkyl aryl ethers into their respective alkylphenols r a i n s to raise mchanistic studies in argunents?D x evidences were adduced either in 3 favor of or against the alternative mechanisms of intemlecular or intr-lecular4 rearrangerent.In most of the reactions substantiating the effective rearrangerrent to yield o-and palkyl--5