Henze

L. J. Clarke, Surface Crystallography -An Introduction to Low Energy Electron Diffraction, John Wiley and Sons, Chichester, 1985. 2-245 U. ScHEiTHAUER, G. Meyer, M. Henz-LER, Surf Sci. 178 (1986) 441. 

The first improvement of the Bucherer-Bergs reaction was the Bucherer-Lieb variation using the diluted alcoholic solution as described at the end of section 7.2.2. The Bucherer-Lieb variation is possibly the most popular process for synthesizing hydantoins. Another notable variation is the Henze modification using fusing acetamide as the solvent in place of water, benzene or 50% alcohol. Recently, ultrasound-promoted hydantoin synthesis has been reported to accelerate the reaction. 

The other most important synthetic utility of the Bucherer-Bergs reaction is the preparation of amino acids from the hydrolysis of hydantoins. When carbonyl 1 was symmetrical, the Henze modification gave hydantoin 2, which was then hydrolyzed to the... 

The Reissert-Henze reaction offers a method to prepare cyanopyridines and extends the Reissert and Kaufmann reactions in the quinoline and isoquinoline series. 

One can extend the strategy employed in the Reissert-Henze reaction to nucleophiles other than cyanide. Phosphorus-based systems were employed in the... 

Henze, H.R. U.S. Patent 2,409,754 October 22, 1946 assigned to Parke, Davis Company... 

Cayley s extensive computations have been checked and, where necessary, adjusted. Real progress has been achieved by two American chemists, Henze and Blair Not only did the two authors expand Cayley s computations, but they also improved the method and introduced more classes into the compound. Lunn and Senior , on the other hand, discovered independently of Cayley s problems that certain numbers of isomers are closely related to permutation groups. In the present paper, I will extend Cayley s problems in various ways, expose their relationship with the theory of permutation groups and with certain functional equations, and determine the asymptotic values of the numbers in question. The results are described in the next four chapters. More detailed summaries of these chapters are given below. Some of the results presented here in detail have been outlined before ... 

The method to derive T was given by Cayley, who established the functional equation in the form of (1) for the function t(x). Cayley s computations of R are more laborious. Henze and Blair have derived the recursion formula (2.56) by direct combinatorial considerations, without knowledge of the functional equation. Here, (2.56) is a consequence of the functional equation (4). 

BlaC31 Blair, C. M., Henze, H. R. The number of structurally isomeric alcohols of the methanol series. J. Amer. Chem. Soc. 53 (1931) 3042-3046. 

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