Generation and synthetic uses of stable 4-[2-isopropylidene]-phenol carbocation from bisphenol A.

Organic letters

PubMedID: 15228274

Chen WF, Lin HY, Dai SA. Generation and synthetic uses of stable 4-[2-isopropylidene]-phenol carbocation from bisphenol A. Org Lett. 2004;6(14):2341-3.
[reaction: see text] Stable 4-[2-isopropylidene]-phenol carbocation, IPP cation 1, was generated readily by addition of bisphenol A in concentrated sulfuric acid at ambient temperature, and the cation could be used for facile syntheses of 4-isopropenyl phenol (IPP), IPP dimers, and spiro-bisphenol derivatives.