C-Methylation of alcohols by trimethylaluminium
DW Harney, A Meisters and T Mole
Australian Journal of Chemistry
27(8) 1639 - 1653
Published: 1974
Abstract
Tertiary alcohols and aryl alkyl carbinols are C-methylated by excess trimethylaluminium, mostly at temperatures in the range 100-200º. Thus t-butyl alcohol gives neopentane, 1,l-diphenylethanol gives 2,2-diphenylpropane, 2-phenylpropan-2-ol gives t-butylbenzene, and tri-p-ethoxyphenyl- methanol gives l,l,l-tri-p-ethoxyphenylethane. 1-Methyladamantane is obtained from adamantan-1-ol and excess trimethylaluminium or by pyrolysis of dimethylaluminium 1-adamantyl oxide. l,l,l-Triphenylethane is obtained from tri-phenylmethanol and excess trimethylaluminium (at temperatures as low as 60º), by pyrolysis of dimethylaluminium triphenylmethoxide, or by reaction of triphenylmethyl dimer with various methylmetallic compounds. Catalysis and other mechanistically significant features of the new 'exhaustive methylation' are discussed, and experimental procedures for the use of alkylaluminium compounds in the organic laboratory are described.https://doi.org/10.1071/CH9741639
© CSIRO 1974