Über Oxalo‐sorbinsäure‐diäthylester

Abstract

Borsche, Manteuffel:[ J h g . 65 Im nachstehenden sind cinige Analysen-Angaben angefiihrt. die die Brauchbarkeit der Method? veranschaulichen sollen. Es wurden mit Ahsicht Substanzen mit sehr tiefen Siedepunkten gewahlt, die auch bei lullerst geringen Mengen sehr gute M'erte liefern. Als Losungsmittel wurde ,,Camp hen" !nit der molekularen Schmelzpunkts-Erniedrigung E = 31.08 verwendet: Chloroform. 1.z79mgin 14.982 mg Loses.-Mittcl: A = 22.3'; gef. M 119.0, ber. M 119.4. Atbylacetat 0.660 ,, ,, 11.5Sj ,. A = 1 9 .

Polyene Syntheses.

“…The next homolog of this series was prepared with ethyl sórbate (7). Rubidium ethylate has been recommended for these condensations, but the condensation of the higher members of the series requires the presence of pyridine (29,62,63,64).…”

Studies on the Chemistry of Heterocyclics. XV. The Synthesis of Thiophene Polyenes

“…of 20% potassium hydroxide for four hours. Following reduction with sodium amalgam and acidification, the trans-trans dihydromuconic acid (4.3 g., 76.0%) melted at 294.5-295° ( 17,25). 1 ,ß-Hexadiene-B, 4-dicarboxylic acid was obtained in a similar fashion from ethyl sórbate (17).…”

“…Phenylacetic acid (14.0 g., 0.103 mole), 2-thenaldehyde (11.0 g., 0.1 mole), and 30.0 g. of acetic anhydride were refluxed with 10.0 g. of litharge. The ethylene (4.6 g., 25.0%) melted at 110-111°. 4 (b) Activated magnesium was covered with 10 ce.…”