Selective monoalkylation of p-tert-butylcalix-[4]-arene in a methyl carbonate ionic liquid.

Methyl carbonate ionic liquids are shown to readily mono-deprotonate p-tert-butylcalix-[4]-arenes initiating the formation of an organic mono-anionic p-tert-butylcalix-[4]-arate salt, methanol and carbon dioxide. These calix-[4]-arate salts have been successfully used in alkylation reactions with dialkyl sulfates and alkyl halides to form a mono-alkylated single product with high yield. This method avoids the common use of alkali metal bases such as caesium fluoride hence providing a safer and more selective synthetic route.

[Ramdohr invagination operation and its significance for development of intestinal suture technique]. / Die Invaginationsoperation von Ramdohr und ihre Bedeutung für die Entwicklung der Intestinalnaht.

The development of the modern intestinal suture began with the invagination operation, performed by the German surgeon P.F. Ramdohr in Wolfenbüttel in 1727. Today this fact is largely forgotten. Yet this operation stimulated not only Jobert de Lamballe (1824) but also Lembert (1826) to perform their animal experiments on sutures in the intestine. Also all later modifications of these suture techniques took into consideration the principle of invagination.

[Results following a morphologically differentiated surgical technic in inguinal hernia of the adult]. / Ergebnisse nach morphologisch differenzierter Operationstechnik beim Leistenbruch des Erwachsenen.

The high recurrence rate after exclusive operation of inguinal hernias of adults by a Bassini suture stimulated us, to develop a morphologically differentiated procedure more than 11 years ago, by which larger defects in the inguinal wall are closed by an implantation of polyester mesh. The conducted reexamination of our patients operated in the years 1976 to 1984 shows a recurrence rate of 0.79% and so the correctness of our technique.

[Intense segmentary subserosis lipomatosis of the small bowel (author's transl)]. / Hochgradige, segmental begrenzte, subseröse Lipomatose des Dünndarms.

Report of an operated case with an intense segmentary subserosis lipomatosis of the ileum, the clinical and anatomical symptoms of this very seldom disease described.

[Colonic suture technique: double-layer suture (author's transl)]. / Colon-nahttechnik: Zweireihige Naht.

A comparison of the results with single- and double-layer adapting sutures without general proximal colostomy shows no differences. This fact is supported by our experiences in 106 resections of the left half of the large bowel.