Dynamit Nobel Aktiengesellschaft

Fritz Englander

Klaus-Dieter Steffen

Jurgen Amort

Gunther Meyer

A method of preparing terephthalic aldehyde or isophthalic aldehyde from p-xylene or m-xylene, which comprises chlorinating the side chain or p or m xylene to a chlorination degree of 2.5 to 3.5, and thereafter contacting the so-chlorinated product with hexamethylenetetramine in aqueous solution at elevated temperature whereby the corresponding aldehyde is obtained.

Method of preparing terephthalic aldehyde and isophthalic aldehyde

Method of preparing phthalide by hydrogenolysis of 3-chlorophthalide in the presence of a nobel metal catalyst, wherein hydrogenolysis is carried out in the absence of HCl acceptor. The phthalide which is produced is a valuable chemical intermediate for the manufacture of dyes, plant protecting agents and pharmaceuticals.

Method of preparing phthalide

Vinyl fluoride having an impurities content of less than 100 parts per million; a method of preparing vinyl fluoride with an impurities content of less than 100 parts per million which comprises contacting gaseous vinyl fluoride with a finely divided copper containing catalyst composition at a temperature of between 0.degree. and 100.degree. C.; a polyvinyl fluoride organosol having an organosol viscosity, determined in a 40 wt.% suspension in propylene carbonate of 20 to 100 cP; a method of producing a polyvinyl fluoride which when suspended in a suspension in polypropylene carbonate in an amount of 40 wt.% has an organosol viscosity of about 20 to 100 cP. which comprises heating vinyl fluoride in an aqueous medium containing a water soluble azo initiator at a pressure less than 140 kp./cm.sup.2 at a temperature of 60.degree.-85.degree. C.

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Bonn, Germany

Fritz Englander