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For Abstract see ChemInform Abstract in Full Text.

Other 6-membered heterocycles R 0670New Preparation of 1,2,4,5-Tetraoxanes. -A new convenient synthesis of spirocyclic tetraoxanes is presented, involving the reaction of gem-bis(hydroperoxy)cycloalkanes, e.g. (I), with acetals or ketals catalyzed by BF3·OEt2. A wide range of acetals of alicyclic and acyclic carbonyl compounds is tolerated. In most cases, a mixture of unsymmetrical and symmetrical tetraoxanes is obtained, the latter by bis (hydroperoxide) dimerization. -(TERENT'EV, A. O.; KUTKIN, A. V.; STARIKOVA, Z. A.; ANTIPIN, M. Y.; OGIBIN*, Y. N.; NIKISHIN, G.

Electrolysis of salts of primary and secondary nitro compounds (nitroethane, 1 and 2 nitropropanes, nitrocyclohexane, and nitrocycloheptane) in the presence of excess halide, nitrite, cyanide, and phenylsulfinate anions under undivided and divided amperostatic elec trolysis conditions in a two phase medium (CH 2 Cl 2 /H 2 O) produces geminal nitrohalides (35-85% yields), dinitro compounds (15-51%), nitronitriles (6-27%), and nitrosulfones (50-70%). The salts of secondary nitro compounds form the products of oxidative coupling with halide and phenylsulfinate anions under the undivided electrolysis conditions. In all other cases, divided electrolysis is required.

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