The reactions of the dithienodisilacyclohexadiene derivative (1) with diphenylacetylene, dimethyl acetylenedicarboxylate, and phenylacetylene in the presence of a palladium catalyst at 150 °C afforded the respective adducts 2-4, arising from insertion of a triple bond of the alkynes into the silicon-silicon bond of 1, together with a small amount of the oxygen-insertion product 5, derived from oxidation of the silicon-silicon bond of 1 by molecular oxygen. The oxidation reaction of 1 with trimethylamine N-oxide cleanly produced 5 in high yield. The absorption and emission maxima of 2-5 were markedly blueshifted from those of 1. The optical band gaps taken from the absorption spectra of 2-5 agreed very closely with the HOMO-LUMO energy gaps of the model compounds (6-8) derived from MO calculations, at the level of B3LYP/6-31+G(dp). The structures of adducts 2 and 3 were determined by single-crystal X-ray crystallography.

A Piperidinium Triflate Catalyzed Biginelli Reaction. -The three-component reaction which uses special heterocyclic aldehydes to give biopertinent hydropyrimidines opens a broad field of versatility (20 examples). -(RAMALINGAN, C.; PARK, S.-J.; LEE, I.

Indole derivatives R 0140Novel Furanylarylene Arylsulfonylindolesulfonamides: Synthesis and Their Antibacterial Evaluation. -Ten title compounds of type (VI) are prepared and derivatives (VIa) and (VId) are found to exhibit better activities against some bacteria strains than streptomycin. -(RAMALINGAN, C.; LEE, I.-S.; KWAK*, Y.-W.; Chem.

Key Words: Hemagglutinin Hemolysin Korean ascidian Two kinds of humoral factors were observed in 2 orders, 7 families, 10 genera, and 15 different species of Korean ascidians. They are the naturally occuring hemagglutinins and/or hemolysins against human erythrocytes A, B, and 0. All but two species showed aggregative activity, although there were considerable variations in titer. The weak agglutinating and lytic activities were increased in the presence of Ca ++