29.01.2013 Views

Weygand/Hilgetag Preparative Organic Chemistry

Weygand/Hilgetag Preparative Organic Chemistry

Weygand/Hilgetag Preparative Organic Chemistry

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

842 Formation of carbon-carbon multiple bonds<br />

dizing vicinal dihydrazones with silver trifluoroacetate and triethylamine<br />

with acetonitrile or ethanol as solvent: 208<br />

C6H5 C—CC6H5<br />

|| || + 4CF3COOAg+ 4N(C2H5)3 ><br />

NH2—N N—NH2<br />

C6H5C=CC6H5 + 4(C2H5)3NH + [CF3COO]- + 4Ag + 2N2<br />

Certain cyclic acetylenic compounds can also be synthesized by this method,<br />

e.g., cyclodecyne 209 in 36% yield by oxidation of 1,2-cyclodecanedione dihydrazone<br />

with yellow mercuric oxide in benzene containing ethanolic potassium<br />

hydroxide solution and anhydrous sodium sulfate; and cyclodecyne has<br />

been obtained similarly. 210<br />

[CH2], |<br />

z HgO in benzene<br />

Several reviews 211 are available for consultation regarding the preparation<br />

of acetylenes.<br />

208 M. S. Nemwan and D. E. Reid, /. Org. Chem., 23, 665 (1958).<br />

209 A. T. Blomquist, R. E. Burge, and A. C. Sucsy, /. Amer. Chem. Soc, 74, 3636 (1952).<br />

210 V. Prelog and M. Speck, Helv. Chim. Acta, 38, 1790 (1952).<br />

211 T. L. Jacobs, Org. Reactions, 5, 1 (1949); W. Franke, W. Ziegenbein, and H. Meister,<br />

Angew. Chem., 72, 392 (1960); J. F. Arens, Advan. Org. Chem., 2, 121 (1960).

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!