Copper chromite reduction of ethyl pinonate

Abstract

A correlation of molecular flexibility with ring size is also possible in both types of ethers I11 and IV. Compounds V, VI, and VII, which differ only in number of ring difluoromethylene groups (from four-to six-membered rings), vary in order of 0°F. viscosity in ring-size order of 6 >> 4 > 5. The same relationship in the Type IV ethers establishes the better fluid properties of perfluorinated cyclopentane and cyclobutane systems over cyclohexane systems.The thermal stabilities of most of these ethers averaged about 500°F., although V and VI1 ethers had stabilities above 550" F., with the high fluorine content of both ether types resulting in good fire resistance properties. The perfluorocyclobutene trimer, XV, was an extremely mobile fluid with a viscosity of 117 cs. a t -65"F., compared to the acyclic n-CI2Fz6, which is a solid a t 167" F. The thermal stability of XV was above 900" F., as measured by a pressure isoteniscope.