Die Kristallstruktur des wasserfreien Chrom(II)-chlorides

✍ Scribed by H. R. Oswald

• Book ID: 102247589
• Publisher: John Wiley and Sons
• Year: 1961
• Tongue: German
• Weight: 328 KB
• Volume: 44
• Category: Article
• ISSN: 0018-019X
• DOI: 10.1002/hlca.19610440423

✦ Synopsis

lactone acid in prisms, m.p. 238-239", [ u ] g = -68.4" (c = 0.48 in methanol). IR. spectrum see Fig. 3.

Lactone ester X I b f r o m neoabietic acid: 20 mg of the above acid were methylated with diazoniethane (from 1 g of nitrosomethylurea) to yield 15 mg of the lactone ester, crystallising from ethyl acetate in cubes, m. p. 170°, [a@ = -80.6" (c = 0.92 in methanol). IR. spectrum see Fig. 4.

We are grateful to Prof. B. G. L. SWAMY for collection and identification of the plant material and to Dr. GEORGE SLOMP for the measurement and interpretation of the NMR. spectrum of polyalthic acid. We thank Dr. A. WETTSTEIN of CIBA and Dr. T. F. SANDERSON of HERCULES POWDER Co. for samples of neoabietic acid, Prof. G. N. RAMACHANDRAN for the X-ray powder photographs and Mr. S. SELVAVINAYAKAM for the microanalyses. Our thanks are due to the