β Scribed by Leroy H. Klemm; Milton Orchin
No coin nor oath required. For personal study only.
The reaction of HCo(CO) 4 (HT) or DCo(CO) 4 (DT) with excess cinnamaldehyde (CA) in methylcyclohexane (RH) at 22.2Β°and under 1 atm of CO follows pseudo-first-order kinetics in HT or DT with an inverse isotopic effect of 0.54. Identified products of the reaction are hydrocinnamaldehyde (HCA) and styrene (STY). The STY is believed to be an artifact of the thermal decomposition of the true product PhCH 2 CH 2 C( Ο O)Co(CO) 4 (X) or its isomer. Reduction of the carbon-carbon double bond in CA is effected by hydrogen from both the cobalt compound and RH. It is proposed that the reaction involves a free-radical chain mechanism in which the rate of the slow step is proportional to [CA] 0 n , the initial molar concentration of CA raised to a power of 1.5 -1.8. Additionally the rate of conversion of CA to HCA and X meets the criteria of a homocompetitive reaction with [CA], [HCA], and [STY] simple functions of t 0.5 (where t is reaction time) for use of DT or (in a single case) a function of (t 0.5 Ο© t) for use of HT.
π SIMILAR VOLUMES
## Abstract Powdered cerium dioxide (ceria, CeO~2~) as compressed, sintered pellets, of porosity 16.4% and density 5.99 g cm^β3^, were treated in hydrogen flow at 1 atm and various temperatures to effect reduction. The electrical conductivity was measured in situ during the reduction process. The c
## Abstract The present letter concerns the reduction of the global size of a patch antenna by the insertion of printed inductive elements. A transmissionβline model is established to relate to the TM100 mode and support the different elaborations of the reduced patch. The global reduction can reac
The present note concerns the reduction of the global size of a planar patch antenna by using the insertion of slots and other capaciti¨e effects. The method of optimizing the size is shown to obtain the best reduction for the patch. Two examples are shown for the S-frequency band with linear polari