A symposium with 28 refs. on reactions of aldehydes R(CH:CH)nCHO (n = 0,1) with arsonium salts Ph3As+CH2(CH:CH)mXBr- (m = 0,1; X = CHO, COMe, CONR1R2), in the presence K2CO3 under phase transfer conditions, to afford title unsatd. compounds R(CH:CH)n+m+1X.

Key words: AMIDES, CONJUGATED DOUBLE BOND COMPOUNDS, STEREOSELECTIVITY, ALDEHYDES, SEX PHEROMONE, KETONE, ORGANO ARSENIUM COMPOUNDS, ARSONIUM COMPOUND, YLIDE