phenylcarbinol, optical purity 27.2%, was recovered upon hydrolysis.(19) A control of the residual optically active 2-methylbutyl group bound to the zinc atom on the stereochemistry of the MPV reaction seems to be excluded.17 In fact, a similar result was obtained when isobutyl[(S)-1-phenyl-2,2-dimethylpropoxy]zlnc (optical purity 10.2%) was heated at 86.5" for 24 hr with an equivalent amount of fert-butyl phenyl ketone; the carbinol recovered was 7.2% optically pure. (20) See ref 6c and 7a and references cited therein.

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Tritylalkyläther (I) werden in Gegenwart von Tritylsalzen (II) in einer Kettenreaktion in Triphenylmethan (III) und die Oxo‐Verbindungen (IV) gespalten.