Page 1. 786 Russian Chemical Bulletin, Vol. 46, No. 4, April, I997 ... VV Bardin* and L. $. Pressman Novosibi~tr [nstitute of Organic Chemistry, Siberian Branch of the Russian Academy of Sciences, 9 ul. Akad. Lavrent'eva, 630090 Novosibirsk, Russian Federation. ...