Henkel Reaction (Raecke process, Henkel process).

B. Raecke Ger. pats. 936,036 (1952) and 958,920 (1952) to Henkel & Cie.
H. B. Watson, Chem. Revs. 7, 180 (1930)
C. S. Marvel, Org. Syntheses 21, 74 (1941)
E. Schwenk and D. Papa, J. Am.Chem. Soc. 70, 3626 (1948)
H. Kwart and E. V. Scalzi, J. Am. Chem. Soc. 86, 5496 (1964).