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Vol. 56 method (as above) at 95"; yield 87%; crystallized from acetone as truncated rhombohedra; m. p. 142' (corr.).Anal. Calcd. for CnHla02Br: Br, 43.59. Found: Br, 43.55.Reduction of 1 g. with zinc dust in 15 cc. of glacial acetic acid (refluxed for two minutes) gave 0.7 g. (84%) of di-(bromophenyl)-phenylfuran. Both di-(bromobenzoy1)phenylethane and di-(bromopheny1)-phenylbromofuran are stable under these conditions in the presence of added zinc bromide in the amount that is formed during a reduction. The residues from this reduction were examined carefully and none of the difficultly soluble and easily crystallized di-(bromobenzoy1)-phenylethane was isolated. (7) Woodburn and Whitmore, not yet published. (8) Landolt-Btlmstein-Roth-Scheel, "Physikalisch-chemirche (9) Ramsay and Young, J . Chcm. SOC., 47, 42 (1885).

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Vol. 57 compounds have in fact been shown by chemical methods to be identical.5 Absorption curves obtained subsequently on synthetic 4-methyl-5-/3hydroxyethylthiazole and its methiodide show equally close correspondence to the curves of the basic cleavage product and its methiodide, respectively, but are omitted from Figs. 1 and 2 for Fig. 3.-1, •-• Oxidation product of basic cleavage product; 2, O-O 4-methylthiazole, 5-carboxylic acid.