Verfahren zur Umsetzung von Phenolen mit Chinolaethern

摘要

1,193,526. O,O1-Biphenols. 1 Oct., 1968 [12 Jan., 1968], No. 46548/68. Heading C2C. 4,41,6,61- Tetra - substituted - 0,01 - biphenols are obtained by reacting in the liquid phase a phenol of formula with a spiro quinol ether of the formula where R 1 , R 2 , R 3 , R 4 , R 5 and R 6 are tert. alkyl groups having from 4 to 8 carbon atoms. Dealkylated biphenols may be obtained by treatment with an alkylation catalyst under atmospheric or subatmospheric pressure, high temperature and removal of the olefin from the reaction mixture. Basic catalysts may be used to remove the alkyl groups in o position to the OH groups first, further heating or the use of an acidic catalyst is required to remove the alkyl groups in p-positions to the OH groups. Examples are given which illustrate these processes. The spiro quinol ether of the above formula may be obtained by oxidatively coupling a di- (tert-alkyl)-phenol or a portion of the biphenol product. Examples are given where 3,31,5,51- tetra - tert - butyl - spiro - (3,5 - cyclohexadiene - 1 ,81[7]oxabicyclo[4,2,0]octa[1,3,5]tri ene)-2-one is prepared.