3-Hydroxy-2,2,4-trimethyl-3-pentenoic acid 0-lactone

Hydroxy-2,2,4-trimethyl-3-pentenoic acid 0-lactone, see Dimethylke-tene 8-lactone dimer Hypoiodite reaction, 46, 62... [Pg.76]

Caution The starting material in this preparation, 3-hydroxy-2,2,4-trimethyl-3-pentenoic acid -lactone, is a mild but deceptively persistent lachrymator. [Pg.126]

DIMETHYLKETENE /3-LACTONE DIMER (3-Pentenoic acid, 3-hydroxy-2,2,4-trimethyl- /3-lactone)... [Pg.37]

A mixture of 5 g. of anhydrous zinc chloride (Note 1) and 280 g. (2.00 moles) of 3-hydroxy-2,2,4-trimethyl-3-pentenoic acid /3-lactone is placed in a 500-ml. three-necked flask equipped with a sealed stirrer (Note 2), a coarse fritted-glass gas-dispersion thimble, a thermometer immersed in the liquid, and an air-cooled reflux condenser (Note 3). The outlet of the condenser is connected to a bubble counter filled with concentrated sulfuric acid this in turn is vented to the atmosphere through a water scrubber. The flask is immersed in an ice bath, and stirring is started. When the temperature of the mixture is about 10°, anhydrous hydrogen chloride is introduced through the gas-dispersion tube... [Pg.126]

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