US Government As Represented by the Secretary of the Army

James H Bentley

Michael J Young

Airplane tire fin

A high yield, four step synthesis process is disclosed for producing the omer, 2,3-diphenyl-1,3-butadiene, wherein in step 1 acetophenone pinacol is produced from the dimerization of acetophenone in 96% yield; in step 2 acetophenone pinacol is reacted with triethoxymethane and benzoic acid to produce 2,3-diphenyl-2-butene in about 88-96% yield. The 2,3-diphenyl-2-butene and N-bromosuccinimide (NBS) are reacted together in step 3 in an ultra violet reactor and in a CCl.sub.4 reaction solvent to produce in about 92% yield, the dibromo compound, 1,4-dibromo-2,3-diphenyl-2-butene. In step 4, 1,4-dibromo-2,3-diphenyl-2-butene is converted to the desired monomer in about 86% yield by reacting with NaI under refluxing conditions for about 90 minutes in a hot acetone solution. The monomer 2,3-diphenyl-1,3-butadiene is recovered in hexane, shaken (in the order listed) with water solutions of NaHSO.sub.3, NaHCO.sub.3, and pure water, dried over CaCl.sub.2, and the hexane is spun off. The residue is then recrystallized from hot methyl alcohol by the addition of water. The crystals which are air dried should be refrigerated as soon as possible to prevent spontaneous polymerization.

Facile, high yield synthesis of 2,3-diphenyl-1,3-butadiene

Base for supporting a refuse receptacle or the like

A self pumping spark gap that switches high voltage current in large amou and provides for a flow of gas by use of one way valves. The valves open and close in accordance with changes in pressure experienced during the sparking sequence.

Growing community of inventors

Huntsville, AL, United States of America

James H Bentley