No abstract

Excellent extrapolations to absolute zero can be obtained for dry air using a simple apparatus constructed from an Erlenmeyer flask, an oil manostat and a plastic syringe.

The reaction of aroyl cyanides with dichloromethylenetriphenylphosphorane, prepared in situ from carbon tetrachloride and triphenylphosphine, provides a convenient synthesis of 2-aryl-3,3-dichloroacrylonitriles. Aroyl cyanides studied in this reaction were benzoyl, 4-methylbenzoyl, 4-chlorobenzoyl, 4-methoxybenzoyl, and 4-nitrobenzoyl cyanide. Only 4-nitrobenzoyl cyanide failed to yield the desired product.The Wittig reaction has provided an exceptionally versatile technique for the preparation of olefinic compounds. The literature bears proof of this with numerous examples of reactions of phosphorus ylides with aldehydes, ketones, acid chlorides, esters, anhydrides, and nitriles.1 Except for our previous report,2 there are no examples of the reaction phosphorus ylides with acyl cyanides. In particular, the reaction of dichloromethylenetriphenylphosphorane (II) with aroyl cyanides (I) offers a unique synthesis of 2-ary 1-3,3-dichloroacrylonitriles (III). Previous methods of syn-

Aroylcyanide (I) reagieren mit Triphenylphosphin in Tetrachlorkohlenstoff über die Ylid‐Stufe (II) zu den 2‐Aryl‐3,3‐dichlor‐acrylnitrilen (III).

A Star Trek example of a mass-to-energy conversion important in nuclear reactions.