New syntheses of 1,2-dimethyl-, 1,2,3- and 1,2,4-trimethyl-, and 1,2,3,4-tetramethyl-naphthalenes are described. Gattermann formylations can proceed abnormally above 65° both 2,3- and 1,4-dimethylnaphthalenes affording 2,4-dimethylnaphthalene-1-carbaldehyde.
F. M. Aslam, P. H. Gore and M. Jehangir, J. Chem. Soc., Perkin Trans. 1, 1972, 892 DOI: 10.1039/P19720000892
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