Alkyl -phenylethenyl

Alkyl phenylethynyl telluriums were reduced by sodium borohydride in refluxing ethanol to (Z)-alkyl phenylethenyl telluriums1,2. 

Z)-Alkyl Phenylethenyl Tellariam1 Under nitrogen, 93 mg (2.5 mmol) sodium borohydride in 3 ml ethanol are added to the alkyl phenylethynyl tellurium (2.0 mmol) in 10 ml ethanol. The stirred solution is refluxed for 3 h. 0.5 ml water, 0,5 ml 10% aqueous sodium hydroxide and then 30 ml diethyl ether are added. The mixture is washed with brine. The organic phase is separated, dried with anhydrous magnesium sulfate, Tillered, and the filtrate evaporated. The residue is chromatographed on silica gel with hexane as mobile phase. 

Alkyl phenyl telluriums and diaryl telluriums react with Grignard reagents in THF or diethyl ether in the presence of catalytic amounts of nickel- or cobalt-phosphane complexes. Tellurium is precipitated. The organic groups combine to form in most cases all three possible coupling products in ratios determined by reaction conditions . The reaction of ( Z,)-phenylethenyl phenyl tellurium and phenyl magnesium bromide formed almost exclusively ( Zj-stilbene in quantitative yield. ( ZJ-Ethoxycarbonylethenyl phenyl tellurium and phenyl magnesium bromide reacted differently ( Fj-ethoxycarbonyl-(phenyl)-ethene and diphenyl tellurium were produced. Tellurium was not formed. ... 

The formation of the dialkyl (2-oxoalkyl)phosphonates (539) illustrates the regioselec-tive nucleophilic attack by phosphite anion, with rearrangement and displacement of sulphinate anion, applicable when R = C1-C5 alkyl and R = H, Me or Ph in the single case when Ar = Ph, R = H and R = Ph, the product was diethyl (2-phenylethenyl)phospho-... 

Other side chains include unusually long n-alkyl groups, - cyclics (cy-clolinear carbosiloxanes), fluorocarbons, phenylethenyl substituents, Cr-bound carbazole chromophores, and pendant bicyclic fragments. ... 

---