Two new condensed guaiazulenoid pigments, gorgiabisazulene and gorgiagallylazulene, have been isolated from a gorgonian Acalycigorgia sp. and their structures have been established on the basis of spectroscopic and chemical evidence.

Four new bioactive polyacetylenes have been isolated from the marine sponge Petrosia sp. Their structures including absolute stereochemistry have been elucidated by spectral and chemical methods.

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Semiempirical molecular orbital calculations ( M N DO and P M 3 ) show that the lithium Z-enolates derived from N-alkylideneglycinates react with a,P-unsaturated esters through a stepwise mechanism via the intermediate formation of Michael adducts. The initial step involves an antiselective carbon

Two new triterpenoids, skimmiarepin A and B, which both exhibit an insect growth inhibitory activity against the silkworm, Bombyx mori L., have been isolated from the leaves and the fruit of Skimmia japonica Thunb. var. intermedia Komatsu f. repens (Nakai) Hara. Their structures have been determined by extensive 2D NMR studies and chemical methods.