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Das Verhalten der Epoxynorbornane (I), (II) und (V) gegenüber Nucle0‐ philen wird am Beispiel der Reaktionen mit Dimethylamin untersucht.

A comparison of the frequencies of stabilized He-Ne/I2'I2 lasers at X = 633 nm in Helsinlu (Finland) is reported. This comparison involved two lasers from the D. I. Mendeleyev Institute for Metrology (Russian Federation) and the Technical Inspection Centre (Finland). The frequency difference between laser radiations is 2,8 kHz with a standard uncertainty of 3,4 kHz.The comparison described here is part of the work carried out between national standards laboratories for the investigation of the metrological characteristics of He-Ne lasers stabilized by saturated absorption on the transition 11-5 R (127) in iodine-127 (He-Ne/lZ7I2). This transition at 633 nm is one of those recommended by the CIPM in 1983 [l] for the practical realization of the metre.Laser comparisons have been carried out within the framework of the D. I. Mendeleyev Institute for Metrology (VNIIM) and the Technical Inspection Centre (TTK) in a joint programme on stabilized lasers. The first comparison of VNIIM and TTK He-Ne& lasers at 633 nm was carried out in December 1987. At that time the frequency difference between the VNIIM laser and the TTK laser TTK2 was (-6+6) kHz. No major modifications have been made to the TTK lasers since that time. The frequency difference between two TTK lasers, TTKl and TTK2, has been in the range ( l o + 10) kHz for many years.The comparison of He-NeA2 lasers reported here was carried out from 8 to 16 January 1991 at Helsinki University of Technology.The TTK laser TTKl used in the comparison has the following characteristics:(a) The length of the cavity made of Invar is 41 cm.

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1991amines amines (acyclic compounds) P 0060 -089Some Properties of N-Alkylsulfamic Acids.-The sulfamic acid chloride (I) is converted to the ester (III) and the amides (V) and (VII) by common methods. -(GAER, S. A.; GAREEV, G. A.; STEPANOVA, N. V.; SAKOVICH, G. V.; BOL'SHEDVORSKAYA, R. L.; FILIPPOVA, T. M.; VERESHCHAGIN, L. I.; Zh.