Dyson

Dyson, A Short Ouide to Chemical Literature, pp. 68-74 (1961) (Longmans, Qreen)... 

P. Dyson and R. RosseUo, Digital Camerasfor Studio Photography, Seybold Pubhcations, Media, Pa., 1995. 

W. L. Dyson, "Book of Papers," 1982AATCC National Technical Conference, Research Triangle Park, N.C., p. 125. 

Since theoretical calcination of effectiveness is based on a hardly realistic model of a system of equal-sized cylindrical pores and a shalq assumption for the tortuosity factor, in some industrially important cases the effectiveness has been measured directly. For ammonia synthesis by Dyson and Simon (Ind. Eng. Chem. Fundam., 7, 605 [1968]) and for SO9 oxidation by Kadlec et aJ. Coll. Czech. Chem. Commun., 33, 2388, 2526 [1968]). 

Fluorophenyl isothiocyanate [1544-68-91 M 153.2, m 24-26 , 26-27 , b 66 /2mm, 215 /atm, 228 /760mm, n 1.6116. Likely impurity is the symmetrical thiourea. Dissolve the isothiocyanate in dry CHCI3, filter and distil the residue in a vacuum. It can also be steam distd, the oily layer separated, dried over CaCl2 and distilled in vacuo. Bis-(4-fluorophenyl)thiourea has m 145 (from aq EtOH). [Browne and Dyson J Chem Soc 3285 1931 Buu Hoi et al. J Chem Soc 1573 1955 Olander Org Synth Coll Vol I 448 1941 ]. 

We wish to thank Professor Carl Djerassi for suggesting that we undertake this effort. We are especially grateful to Drs. N. Dyson, C. Djerassi, I. T. Harrison and J. Pfister, each of whom reviewed the final draft of one of the chapters. Secretarial help by Miss Mary Jakubauskus is also gratefully acknowledged. 

Flowever, ionic liquids acting as transition metal catalysts are not necessarily based on classical Lewis acids. Dyson et al. recently reported the ionic liquid [BMIM][Co(CO)4] [38]. The system was obtained as an intense blue-green colored liquid by metathesis between [BMIM]C1 and Na[Co(CO)4]. The liquid was used as a catalyst in the debromination of 2-bromoketones to their corresponding ketones. 

Finally, a special example of transition metal-catalyzed hydrogenation in which the ionic liquid used does not provide a permanent biphasic reaction system should be mentioned. The hydrogenation of 2-butyne-l,4-diol, reported by Dyson et al., made use of an ionic liquid/water system that underwent a reversible two-... 

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